Rya Formation

Rya Formation
Stratigraphic range: Early Sinemurian-late Aalenian ~
Type	Formation
Sub-units	Döshult, Pankarp, Katslösa & Rydebäck Members
Underlies	Vilhelmsfält & Mariedal Formations
Overlies	Höganäs Formation
Thickness	Up to 295 m (968 ft)
Lithology
Primary	Siltstone, claystone, sandstone, mudstone
Other	Coal
Location
Coordinates	56.0°N 12.8°E / 56.0; 12.8
Approximate paleocoordinates	45.4°N 16.7°E / 45.4; 16.7
Region	Skåne County Øresund Holstein
Country	Sweden Denmark (offshore, subsurface) Germany (ex situ)
Extent	Höganäs & Øresund Basins
Type section
Named for	Rya, Katslösa
Rya Formation (Sweden)

The Rya Formation (Swedish: Ryaformationen) is a geologic formation in Skåne County, southern Sweden. It is Early to early Middle Jurassic (early Sinemurian to late Aalenian) in age. The Rya Formation comprises siltstones, claystones, sandstones, mudstones and rare coal beds. The formation overlies the Höganäs Formation and is overlain by the Vilhelmsfält and Mariedal Formations.

The formation was deposited in the Höganäs and Øresund Basins that formed in the earliest Jurassic as part of the break-up of Pangea. The 295 metres (968 ft) thick formation comprises four members, from base to top the Döshult, Pankarp, Katslösa and Rydebäck Members. The depositional environment of the formation ranges from continental to open marine.

The Rya Formation has provided fossils of a number of sharks, ammonites, bivalves and ichnofossils. Coalified wood occurs as scattered pieces up to 6 centimetres (2.4 in) long and indeterminate belemnites, echinoids, serpulids, ostracods and nodosariid foraminifera were also recorded in the formation. Iron ooids containing erratic boulders, called Geschiebe in German, attributed to the Rya Formation were found in Holstein, northern Germany.

Description

The Rya Formation crops out in Colonus Shale Trough of western Scania. The formation overlies the Höganäs Formation and is overlain by the Vilhelmsfält Formation in the Helsingborg area and by the Mariedal Formation in the area of Landskrona and Kävlinge. The Rya Formation is subdivided, from base to top, into the Döshult, Pankarp, Katslösa and Rydebäck Members. The formation is found in the Ängelholm, Helsingborg, Landskrona and Kävlinge areas. In southwest Skåne, the Rya Formation is missing or only poorly developed. In the Øresund Basin between Sweden and Denmark, the formation is truncated by the Basal Middle Jurassic unconformity.

Erratic boulders, called Geschiebe in German, attributed to the Rya Formation and containing iron ooids were found in Holstein, northern Germany.

Subdivision

Döshult Member

The early Sinemurian Döshult Member (Swedish Döshultsledet) comprises coarse-grained cross-layered sandstones and siltstones in the lower part, and is dominated by dark clays and marls rich in marine fossils in the upper part. The member is up to 80 metres (260 ft) thick in the Ängelholm, Helsingborg and Landskrona areas. Presently, the basal part of this member is exposed at three localities in the Helsingborg area. These contain mineralogically and texturally mature, trough cross-bedded sandstones, commonly with herringbone structures showing north and south oriented paleocurrent directions. The occurrence of herringbone structures in well-sorted sand suggests high energy foreshore to subtidal marine depositional conditions for the lower part of the member. In an abandoned quarry in northwest Skåne (Gantofta brickpit in the Helsingborg area, outcrop very limited at present) the upper part of the Döshult Member commences with bioturbated marine nearshore sands, including burrows, as well as abundant marine invertebrate body fossils. This is followed by a bioturbated shelf mudstone with storm-deposited sand and silt intercalations (tempestites). A massive red mudstone with scarce marine body fossils and burrows follows, which is interpreted as having been deposited rapidly, in a low energy but oxidizing environment. The youngest part of the succession comprises siltstones and mudstones, with carbonate-rich beds, deposited in a shallow marine setting. Coaly detritus, muscovite, very small shells and shell fragments, and framboidal pyrite nodules (0.1–0.3 mm in diameter) are characteristic constituents of this member.

Pankarp Member

The dark mudstones of the Döshult Member are overlain by the Pankarp Member (Swedish Pankarpsledet) with a sharp conglomeratic boundary. The late Sinemurian Pankarp Member has an estimated thickness of up to 70 metres (230 ft) in the subsurface of the Ängelholm, Helsingborg and Landskrona areas. In the Kävlinge area, the thickness is about 20 metres (66 ft) thick. In westernmost Skåne, the member has been observed in small diameter drill cores. There, the member is subdivided into a lower unit of variegated clays and shales, a middle, poorly sorted silty to sandy unit including a coal bed, and an upper monotonous mudstone unit which is silty and rich in organic matter at the base, and reddish–greenish at the top. It presents different coloration probably due to different degrees of oxidation of iron in the claystone. In the uppermost part of one core, the Pankarp Member comprises lenticular bedded heteroliths with Planolites burrows.

Katslösa Member

Map of the Katslösa and Rydeback members

The late Sinemurian to early Pliensbachian Katslösa Member (Swedish Katslösaledet) is mainly known from the subsurface in westernmost Skåne, and it has a thickness of 30 to 40 metres (98 to 131 ft) in the Ängelholm, Helsingborg and Landskrona areas. In the Kävlinge area, the thickness is about 75 metres (246 ft). Sedimentological interpretations are mainly based on the results of petrographical studies of museum collections. The Katslösa Member yields a rich marine microfauna and macrofauna, and it is dominated by homogeneous mudstone deposited in a marine low-energy environment. Is composed mostly by marine green, brown and dark gray claystones and sandstones. Thin beds of matrix-rich quartz wackes are common. They are typically mineralogically mature but texturally highly immature with abundant angular sand grains. The matrix comprises organic matter, micrite, mica and clay minerals. In thin section, the sandstones show evidence of intense burrowing, which has obliterated depositional structures. Scattered berthierine ooids, as well as authigenic siderite crystals have been observed in the member.

Rydebäck Member

The late Pliensbachian to late Aalenian Rydebäck Member (Swedish Rydebäcksledet) is up to 70 metres (230 ft) thick in the Ängelholm, Helsingborg and Landskrona areas. It is only known from subsurface material in westernmost Skåne, and sedimentological analysis is based on observations from two wells (Rydebäck–Fortuna-1 and -4). These layers were deposited in small bands during a sea regression, and consist of marine gray, black, green and reddish brown sand and siltstones. The member comprises a uniform succession of muddy arenites with a rich marine microfauna (mostly foraminifera), and represents deposition in an offshore low-energy environment. The sediments are strongly burrowed, which has caused an effective mixing of sand and mud, resulting in the forming of quartz wackes. The sand is quartz-rich, and grains are typically well rounded. Berthierine ooids are common constituents of the sediment.

Depositional environments

Early Jurassic paleogeography

Tethys Sea transgression entailed formation of fossil-bearing marine deposits in Skane, also associated with an increased tectonic activity. Deposition of the Rya Formation began with nearshore coarse clastics, and continued with offshore mudstones with tempestites (the Döshult Member), followed by offshore muddy sediments with a brief non-marine interval (the Pankarp Member), and ended with deposition of open marine low-energy deposits (Katslösa and Rydebäck Members). The marine Rya Formation shows an overall fining-upwards trend, and an up-section bathymetric deepening of the depositional environment. The depositional environment in western Skåne was either physically protected from the storm energy due to basin topography, or deposition in Skåne took place below storm wavebase. Berthierine ooids occur scattered in the Katslösa Member and are increasingly abundant up-section in the Rydebäck Member. There is a possibility that iron ooid formation was promoted by precipitation of iron and silica from volcanic fluids rising up through the substrate, as has been reported from modern marine sediments offshore Indonesia. This hypothesis has emerged with the publication of age data for the volcanic rocks in Skåne, which now appear to be comparable in age to the prominent iron ooid-bearing deposits, i.e. the Rydebäck Member and the Röddinge Formation.

Age

Based on foraminifers, ammonites and ostracods, the Döshult Member is dated to the early Sinemurian, the Pankarp Member to the late Sinemurian, the Katslösa Member to the late Sinemurian to early Pliensbachian and the Rydebäck Member to the late Pliensbachian to late Aalenian.

The formation is time-equivalent with the Röddinge Formation of the Vomb Trough, the Djupadal Formation in cental Skane and the Sorthat Formation of Denmark, with which it shares the Spheripollenites–Leptolepidites and Callialasporites–Perinopollenites Zones. The formation also correlates with the Fjerritslev Formation of the Danish Basin, and the Gassum Formation of the Øresund Basin. The storm-dominated, hummocky cross-stratified Hasle Formation on Bornholm is contemporaneous with the muddy Katslösa Member of the Rya Formation.

Basin history

The Sorgenfrei-Tornquist Zone (STZ) running through southern Sweden and eastern Denmark is indicated in lightblue

Basement

The basins where the Rya Formation was deposited form part of the Sorgenfrei-Tornquist Zone (STZ) of the Trans-European Suture Zone, the boundary between Baltica to the northeast and Peri-Gondwana to the southwest. The orogeny was active in the Late Ordovician, or approximately 445 million years ago.

At the Carboniferous-Permian boundary around 300 Ma, the area was influenced by the Skagerrak-Centered Large Igneous Province, another large igneous province stretching across the North Sea, the eponymous Skagerrak between Denmark and Sweden and to the northwest up to northern England and Scotland.

Extent of the CAMP

Break-up of Pangea

The basins of southern Sweden and eastern Denmark were formed during the latest Triassic and earliest Jurassic. During this time the Central Atlantic magmatic province (CAMP), with an estimated 11,000,000 square kilometres (4,200,000 sq mi) the largest igneous province in Earth's history, was formed to the present southwest of the Danish-Swedish realm. In the Skåne area, the Central Skåne Volcanic Province was active during the time of deposition of the Rya Formation, commencing around the Sinemurian-Pliensbachian boundary. The earliest magmatism was partly emplaced into and across pre-existing extensional basin structures. The first and the main volcanic phase of this volcanic province occurred in the Early Jurassic (late Sinemurian to Toarcian) at 191–178 Ma. Analysis of the volcanic rocks produced by this Jurassic volcanism suggests a continental Strombolian-type eruptive character close to the oceans of the Early Jurassic. No correlative pyroclastic beds have yet been identified in sedimentary basins surrounding central Skåne.

Toarcian

During deposition of the Rydebäck Member, the Toarcian turnover happened. This event at the Pliensbachian-Toarcian boundary characterized by widespread anoxic conditions globally, led to the extinction of various groups of flora and fauna. Taxa inhabiting the upper water column were unaffected by anoxia and included ammonites and belemnites. Epifaunal taxa adapted to low-oxygen conditions, such as the buchiids, posidoniids and inoceramids, flourished in the post-extinction environment during the survival interval.

Paleogeography of northwestern Europe during the Early Jurassic with Agaleus shark fossil finds. Elevated land areas are shown in grey.

Economic geology

A study on the geothermal potential of reservoirs in the Øresund Basin published in 2018 by Erlström et al. gave results of the formation together with the Gassum and Höganäs Formations, giving the following characteristics of the three Early Jurassic formations:

• Net sand thickness - 60 to 100 metres (200 to 330 ft)
• Porosity - 18 to 34%
• Permeability - 50 to 1500 mD
• Cl⁻ concentration - 120 to 190 gram/liter
• Productivity index - 7.0 m3/hr/bar

A study published in the same year analyzing the CO₂ storage potential of the Rya and Höganäs Formations concluded a storage capacity of 543 megatons of carbon dioxide.

The organic content of the Jurassic strata in Skåne is typically dominated by gas-prone kerogen (type III), which is below, or at the onset of, thermal maturity.

Paleoenvironment

The sedimentological evolution of the Jurassic in southwestern Skåne, specially the Rya Formation, has provided depth diverse data about its different environments, specially on those samples recovered on the Höllviken-2 core and sidewall cores from the FFC-1 well. The unit was linked on all its sedimentological history with the main Fennoscandinavian land. The local succession in the Höllviken Halfgraben and Barsebäck Platform has measured continue during most of the Triassic and Early Jurassic times. Inte western part of the Höllviken Halfgraben during the Hettangian–Pliensbachian succession there is evidence of higher subsidence rate along the Öresund Fault, indicating tectonically controlled deposition and the presence of a submarine high at the west of this fault. In the east is the Skarup Platform, interpreted as a Jurassic high based on its incomplete or missing Rhaetian–Lower Jurassic strata, along redeposited spores and pollen in the Höllviken Halfgraben and increased sand output, that point to this zone as the major freshwater terrestrial source. This deposits shows several nearshore environments, from offshore marine environment probably below wave base on the sinemurian level, as proven by the presence of well cemented fine sand and 2 m thick clay dominated heterolites, that change to more marine influenced flaser bedded heterolites with some strongly bioturbated horizons and convolute beds in the Pliensbachian, and end in the Pliensbachian–Lower Toarcian with a sandy seashore setting with high energy lenticular beds. Some sections are suggested to be tidal flat zones and/or distal bar deltaic deposits. Coeval with the Rydebäck member, at Anholt (Fjerritslev Formation) where studied several levels that point to a connected fluvial system. Concretely the Upper Pliensbachian-Toarcian boundary marks the beginning of a major regression, which continued through the Toarcian and Aalenian. The discovery of the foraminifera Eoguttuliiia liassica, Bony Fishes and Scolecodonts, points that the Pliens-Toar boundary has a shallow water environment, possibly of reduced salinity. The Pollen and spores, identical of those found on the Rydebäck member (Vilhelmsfält Bore No. 1 and Karindal bore no. 1), increase, and the dinoflagellate cysts decrease, suggesting more proximal shoreline. This layers, on both Anholt and the Rydebäck member, are considered to represent a regression from marine inner shelf environments to near lagoonal or deltaic conditions during the late Pliensbachian and early Toarcian, but with ligth marine influence, as show the presence of Dactylioceras on the Rydebäck member. The sequence points concretely than in both units The Late Pliensbachian sediments at were deposited in a storm-influenced Inner Shelf setting, that changed on the Lower Toarcian into a more restricted, marginal-marine conditions with delta progradation. Then in the late Toarcian increased brackish conditions, to end on a short marine encroachment during the Early Aalenian.

The study of the Jurassic sediments has allowed to know that the basement rocks of southern Sweden were deeply weathered in Late Triassic-Cretaceous times, with formed saprolites on the sub-mesozoic basement and high amount of Kaolinite on the stronger weathered profiles, opossed to Smectite on the less weathered ones. Thus, fluvial currents released smectite-rich weathering material to the Late Triassic–Jurassic receiving basins. The members of the Rya Formation recover a transition from deltaic to parallic coast and shallow marine, dominated by Kaolinite, along with peaks of Illite and smectite. The record of this minerals shwed that at the time of deposition of the Rya Formation, mid-latitude warmth and pronounced humidity to drier pseudomediterranean climates allowed on the denuded bedrock in the Fennoscandian Shield, composed of Gneisses or Granites, at places intersected by Dolerite dykes, fracturation and active erosion/weathering. The coeval Djupadal Formation volcanic ash falls at the east Skarup Platform-Cenntral Skane Volcanic Province, may have diluted the marine sediments, with raised smectite content. The pronounced mineralogical maturity of most Swedish post-Norian Mesozoic arenites confirms widespread feldspar destruction in the weathering profiles of the paleozoic cristal basement at the north, as a consequence of the increased humidity.

Fossil content

The formation has provided fossils of typically marine fauna. With the exception of a continental coal bed, the formation is marine in character. Shark teeth were reported from the Rydebäck Member. Apart from a few teeth of the hybodont Hybodus reticulatus, the shark fauna from the Rya Formation is exclusively neoselachian.

Fish

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Genus/Family	Species	Location	Member	Material	Notes/Affinities	Images
Acrodus	Acrodus sp.	Katslosa, Bed 42	Katslösa Member	Small Fragment of Tooth Crown	A marine Shark, member of the Acrodontidae.
Hybodus	Hybodus reticulatus Hybodus sp.	Road between the hamlets of Rya and Katslosa	Rydebäck Member	Fin Spine Multiple Teeth	A marine Shark, member of the Hybodontiformes. Related to Hybodus hauffianus and other genera from the south of Germany. Only non-Neoselachian recovered from the location.
Hexanchidae	Hexanchidae indet.			Single incomplete tooth	Marine Cow Sharks, Incertade Sedis Inside Hexanchidae. Isolated teeth appear to be similar to Hexanchus arzoeensis.
Agaleus	Agaleus dorsetensis			Four incomplete teeth	A Marine Shark of the Family Agaleidae.
Paraorthacodus	Paraorthacodus sp.			Three broken teeth	Marine Sharks of the Family Paleospinacidae. One of the earliest records of the genus Paraorthacodus, together with others from France.
Palidiplospinax	Palidiplospinax occultidens Palidiplospinax enniskilleni Palidiplospinax? sp.			Teeth One complete scale	Marine Sharks of the Family Paleospinacidae. The complete scale described above most closely resembles scales from Synechodus pinnai.
"Synechodus"	"Synechodus" sp.			One complete tooth	Marine Sharks of the Family Paleospinacidae. The tooth described may represent a new species.
Sphenodus	Sphenodus sp.			Two complete teeth	Marine Sharks of the Family Orthacodontidae.
Chimaeriformes	Chimaeriformes Indeterminate			Fragmentary Remains	Incertade Sedis Fragmentary remains of Chimaeras
Actinopterygii	Actinopterygii Indeterminate			Scales Ganoid Scales	Incertade Sedis Bony Fish Scales
Archaeotolithus	Archaeotolithus bornholmiensis	Katslosa, Bed 30	Katslösa Member	20 Otoliths	Fish Otoliths, originally assigned to the extant family Sciaenidae, then from members of Palaeoniscidae and finally some recent research suggest affinities with Pholidophoriformes. Bony Fish Otoliths Similar to ones recovered from the Hasle Formation.
Lepidotes	Lepidotes elvensis	Ahrensburg Erratic Assemblage	Rydebäck Member	Desarticulated Remains	A marine Osteichthyes, member of the family Semionotidae inside Neopterygii.
Pholidophorus	Pholidophorus sp.			Assigned Fragmentary remains	A marine Osteichthyes, member of the family Pholidophoriformes inside Teleostei.	Pholidophorus
Leptolepis	Leptolepis bronni Leptolepis coryphaenoides			Disarticulated specimens	A marine Osteichthyes, type member of the family Leptolepidae inside Teleostei.	Leptolepis
Lycopteroidarum	Lycopteroidarum sp. A Lycopteroidarum sp. B			Otoliths	Marine Osteichthyes otoliths, related with the family Lycopteroidea.
Gyrosteus	Gyrosteus mirabilis			GPIH 4864, Hyomandibula	A marine Osteichthyes, member of the Chondrosteidae inside Acipenseriformes.	Gyrosteus

Amniotes

Genus/Family	Species	Location	Member	Material	Notes/Affinities	Images
Microcleididae	Microcleididae Indeterminate	Ahrensburg Erratic Assemblage	Rydebäck Member	Isolated tooth crown Isolated cervical vertebrae	A plesiosaur, member of the family Plesiosauridae inside Plesiosauroidea.
Seeleyosaurus	Seeleyosaurus? sp.			Three articulated dorsal vertebrae	A plesiosaur, member of the family Plesiosauridae inside Plesiosauroidea. Related with the German Realm Fauna	Seeleysaurus
Meyerasaurus	Meyerasaurus sp.			Incomplete coracoid Associated rib	A pliosauroid, member of the family Rhomaleosauridae inside Pliosauroidea.
Temnodontosaurus?	Temnodontosaurus cf. platyodon			Skull Coracoid Associated rib fragment	An Icthyosaur, type member of Temnodontosauridae inside Neoichthyosauria. Assigned to Ichthyosaurus sp., but also suggested affinities to "Leptopterygius" (= Temnodontosaurus) platyodon.	Restoration
Thalattosuchia	Thalattosuchia indet			Osteoderms	A Crocodrylomorph, member of the family Thalattosuchia inside Neosuchia. Distinctive of the marine teleosaurid genus Macrospondylus.
Megalosauridae	Megalosauridae Indeterminate	Forst Hagen gravel pit		Dorsal Vertebrae	A Saurischian, member of the family Orionides inside Tetanurae. Was referred to Megalosaurus. The affinities of the Specimen aren't clear due to its fragmentary nature. Has been classified as Saurischia indeterminate, although shows clearly characters of the Orionides group (concave articular surfaces and a dished lateral pleurocoel, remnants of the neural arch and postzygapophyses). The vertebrae centrum measures 80 mm, implying a medium-sized theropod (~5 m long). Can be related with Yunyangosaurus.	Marshosaurus, example of basal Orionides

Annelida

• Serpula terquemi
• Serpula quinquesulcata
• Serpula cf. raricostati
• Eklexibella johanni

Echinodermata

• Isocrinus ranae sp. nov.
• Pentacrinus basaltiformis
• Balanocrinus subteroides
• Hispidocrinus scalaris
• ?Acrosaleniidae Indeterminate

Ammonites

• Coroniceras rejnesi
• Megarietites meridionalis
• Paracoroniceras crossi
• Agassiceras nodulatum
• Arnioceras cf. falcaries
• Arnioceras sp. indet.
• Eparietites sp. indet.
• Cymbites striaries
• Asteroceras obtusum
• Oxynoticeras oxynotum
• Oxynoticeras? sp. indet.
• Promicroceras planicostatum
• Promicroceras sp. juv.
• Euagassiceras resupinatum
• Euagassiceras spinaries
• Euagassiceras lundgreni
• Euagassiceras cf. lundgreni
• Uptonia jamesoni
• Polymorphites angustus
• Amaltheus margaritatus
• Pleuroceras spinatum
• Pleuroceras hawskerense
• Amauroceras ferrugineum
• Echioceras raricostatum
• Tragophylloceras ibex
• Prodactylioceras davoei
• Dactylioceras tenuicostatum
• Dactylioceras cf. semicelatum
• Eleganticeras elegantulum
• Lobolytoceras siemensi
• Tiltoniceras capillatum
• Harpoceras falciferum
• Grammoceras thouarsense

Belemnites

• Passaloteuthis alveolata
• Passaloteuthis apicicurvata
• Passaloteuthis cf. virgata
• ?Passaloteuthis sp.
• Pseudohastites charmouthensis
• Pseudohastites cf. arundineus
• "Belemnites" elongatus
• "Belemnites" milleri

Brachiopods

• Zeilleria perforata
• Zeilleria numismalis
• Spiriferina walcotti
• Rhynchonella deffneri

Bivalves

• Chlamys interpunctata
• Chlamys textoria
• Chlamys janiformis
• Chlamys subulata
• Chlamys tullbergi
• Chlamys textaria
• Chlamys interpunctata
• Oxytoma sinemurensis
• Oxytoma inaequivalvis
• Oxytoma scanica
• Astarte sp.
• Astarte angelini
• Astarte fructuum
• Astarte scanensis
• Astarte fortuna
• Astarte deltoidea
• Astarte oerbyensis
• Astarte ryensis
• Tutcheria cingulata
• Tutcheria cf. rickardsoni
• Pseudopis sp.
• Cardinia sp.
• Entolium sp.
• Homomya sp.
• Leda sp.
• Liogryphaeaarcuata sp.
• Nucula sp.
• Nucula distinguenda
• Nuculana sp.
• Nuculana zieteni
• Nuculana doris
• Palaeoneilo sp.
• Palaeoneilo galatea
• Palaeoneilo bornholmiensis
• Palaeoneilo oviformis
• Pleuromya sp.
• Rollieria sp.
• Rollieria bronni
• Grammatodon cypriniformis
• Grammatodon sinuatus
• Grammatodon subrhomboidalis
• Barbatia pulla
• Cardinia tollini
• Cardinia expansa
• Cardinia ingelensis
• Cardinia kullensis
• Trigonia primaeva
• Trigonia modesta
• Tancredia arenacea
• Tancredia securiformis
• Tancredia erdmanni
• Tancredia johnstrupi
• Tancredia lineata
• Sphaeriola kurremolinae
• Protocardia philippiana
• Protocardia oxynoti
• Protocardia truncata
• Eotrapezium gerrnari
• Eotrapezium pullastra
• Eotrapezium heberti
• Eotrapezium menkei
• Anisocardia luggudensis
• Platymya aquarum
• Homomya ovalis
• Homomya venulithus
• Homomya centralis
• Homomya librata
• Arcomya decora
• Arcomya cf. elongata
• Pleuromya forchhammeri
• Pleuromya corrugata
• Goniomya heteropleura
• Gervillia angelini
• Gervillia scanica
• Gervillia hagenowi
• Gervillia sjögreni
• Isognomon sp.
• Lima duplicata
• Lima pectinoides
• Plagiostoma succincta
• Limea acuticostata
• Limea katsloesensis
• Entolium hehli
• Entolium calvum
• Entolium cingulatum
• Entolium lundgreni
• Pseudopecten aequivalvis
• Dimyodon sp.
• Plicatula spinosa
• Plicatula orbiculoides
• Terquemia arietis
• Anomia pellucida
• Liastrea hisingeri
• Liogryphaea arcuata
• Liogryphaea lata
• Lioqryphaea regularis
• Modiola hillana
• Modiola ruuthi
• Modiola cf. tenuissima
• Modiola scalprum
• Mytilus cf. lamellosus
• Myoconcha decorata
• Taeniodon nathorsti

Gasteropods

• Actaeonina nathorsti
• Actaeonina cf. striata
• Chrysostoma cf. solarium
• Chemnitzia sp.
• Trochus cf. imbricatus
• Trochus laevis
• Ptychomphalus cf. expansus
• Kalchreuthia frankei

Scaphopods

• "Dentalium" hexagonale
• Prodentalium bandeli
• Laevidentalium sp.
• Laevidentalium elongatum
• Progadilina spaethi
• Progadilina subtrigonalis
• Baltodentalium weitschati

Ostracods

• Citharina inaequistriata
• Marginulina spinata spinata
• Astacolus denticulina carinata
• Brizalina liassica amalthea
• Ogmoconchella danica
• Ogmoconchella mouhersensis
• Ogmoconchella adenticulata
• Pleurifera harpa
• Ogmoconcha amalthei amalthei
• Cristacythere crassireticulata
• Nanacythere simplex

Insects

• Heterothemis brodiei
• Protogryllus acutipennis
• Blattula langfeldti
• Limoniidae gen. et sp. indet
• Coleoptera gen. et sp. indet

Ichnofossils

• Chondrites sp.
• Rhizocorallium sp.
• Diplocraterion sp.
• Planolites sp.
• Skolithos sp.
• Teichichnus sp.

Plant Remains

Coalified wood occurs as scattered pieces up to 6 centimetres (2.4 in) long and indeterminate belemnites, echinoids, serpulids, ostracods and nodosariid foraminifera were also recorded in the formation. Ammonites where found on layers with plant fossils. Fragments of Dactylioceras were found at a depth of 170 m in the Vilhelmsfalt borehole, together with plant remains and beautifully preserved Pelecypods. The plant material, probably derived from watercourses emptying in the neighborhood, consists mostly of small fragments that seem to have been intimately sedimented with the muddy material that flocculated on meeting the seawater. Other specimen, Arnioceras sp. indet. occurs on what appears to be a transitional environment, probably a back-beach with coalified fragments of plants, some of the large. Probably due to the shell being washed to land due to a storm.

Palynology

Genus	Species	Stratigraphic position	Member	Material	Notes	Images
Botryococcus	Botryococcus sp.	Vilhelmsfält Bore No. 1 Karindal bore no. 1	Rydebäck Member	Miospores	Type Genus of the Botryococcaceae inside Trebouxiales. A colonial green microalga related with freshwater and brackish ponds and lakes around the world, where it often can be found in large floating masses.	Extant Specimen
Schizosporis	Schizosporis sp.				A Green Algae, member of Zygnemataceae
Tasmanites	Tasmanites sp.				A Green Algae, member of Pyramimonadaceae
Campenia	Campenia gigas				A Green Algae, member of Prasinophyceae
Nannoceratopsis	Nannoceratopsis gracilis Nannoceratopsis senex			Cysts	A Dinoflajellate, member of the family Nannoceratopsiaceae. It is a genus related with Marine deposits.
Veryhachium	Veryhachium sp.				A Dinoflajellate, Dinophyceae familia incertae sedis
Foraminisporis	Foraminisporis jurassicus			Spores	Affinities with the family Notothyladaceae inside Anthocerotopsida. Hornwort spores.	Example of extant Notothylas specimens, Foraminisporis come probably from similar genera
Neochomotriletes	Neochomotriletes triangularis
Taurocusporites	Taurocusporites verrucatus
Polycingulatisporites	Polycingulatisporites circulus
Staplinisporites	Staplinisporites caminus				Affinities with the family Encalyptaceae inside Bryopsida. Branching Moss Spores, related with high water-depleting environments	Example of extant Encalypta specimens, Staplinisporites come probably from similar genera
Stereisporites	Stereisporites aulosenensis Stereisporites cicatricosus Sulcatisporites pinoides				Affinities with the family Sphagnaceae inside Sphagnopsida. "Peat moss" spores, relted to genera such as Sphagnum that can store water large amount of water.	Example of extant Sphagnum specimens, Stereisporites, Sculptisporis and Rogalskaisporites come probably from similar genera
Lycopodiumsporites	Lycopodiumsporites clavatoides Lycopodiumsporites pseudoreticulatus Lycopodiumsporites reticulumsporites Lycopodiumsporites semimuris Lycopodiumsporites vilhelmii Lycopodiumsporites sp. Lycopodiumsporites sp sp. nov. Lycopodiumsporites sp.1 sp. nov. Lycopodiumsporites sp.2 sp. nov.				Affinities with the family Lycopodiaceae inside Lycopodiopsida. Lycopod spores, related with herbaceous to arbustive flora common on humid environments	Extant Lycopodium specimens. Genera like Lycopodiumsporites probably come from a similar plant
Foveosporites	Foveosporites moretonensis Fovesporites foveoreticulatus
Lycospora	Lycospora salebrosacea
Semiretisporis	Semiretisporis cf. gothae
Sestrosporites	Sestrosporites pseudoalveolatus
Ceratosporites	Ceratosporites spinosus				Affinities with the Selaginellaceae inside Lycopsida. Herbaceous Lycophyte flora, similar to Ferns, ralated with Humid Settings. This Family of Spores are also the most diverse on the Formation.	Extant Selaginella, typical example of Selaginellaceae. Genera like Ceratosporites and Densoisporites probably come from a similar or a related Plant
Densoisporites	Densoisporites crassus Densoisporites erdtmanii Densoisporites scanicus Densoisporites velatus
Heliosporites	Heliosporites altmarkensis
Cepulina	Cepulina truncata
Neoraistrickia	Neoraistrickia truncata Neoraistrickia sp sp. nov.
Uvaesporites	Uvaesporites argenteaeformis Uvaesporites puzzlei Uvaesporites sp.
Calamospora	Calamospora mesozoica				Affinities with the Calamitaceae inside Equisetales. Horsetails, herbaceous flora related to high humid environments, flooding tolerant plants.	Recosntruction of the Genus Calamites, found associated with Calamospora
Conbaculatisporites	Conbaculatisporites mesozoicus				Incertade Sedis affinities with the Pteridophyta. Uncertain Pteridophyte origin
Tigrisporites	Tigrisporites microrugulatus
Converrucosisporites	Converrucosisporites sp sp. nov.
Verrucosisporites	Verrucosisporites obscurilaesuratus
Cingutriletes	Cingutriletes sp.
Laevigatisporites	Laevigatisporites sp.
Convolutispora	Convolutispora sp.
Ischyosporites	Ischyosporites sp. Guy-.,1986 sp. nov. Ischyosporites variegatus
Simozonotriletes	Simozonotriletes arcuatus
Platyptera	Platyptera sp.1 Guy-.,1986 sp. nov. Platyptera sp.2 sp. nov.
Trachysporites	Trachysporites fuscus Trachysporites asper Trachysporites sp sp. nov.
Leptolepidites	Leptolepidites bossus Leptolepidites equatibossus Leptolepidites macroverrucosus Leptolepidites major Leptolepidites paverus Leptolepidites rotundus Leptolepidites sp.1 sp. nov. Leptolepidites sp.2 sp. nov.				Affinities with the family Dennstaedtiaceae inside Polypodiales. Forest Fern Spores	Example of extant Dennstaedtia specimens, Leptolepidites come probably from similar genera
Lophotriletes	Lophotriletes verrucosus				Affinities with the family Botryopteridaceae inside Polypodiales. Forest Fern Spores
Apiculatisporites	Apiculatisporites parvispinosus				Affinities with the family Zygopteridaceae inside Zygopteridales.
Lycopodiacidites	Lycopodiacidites rugulatus				Affinities with the Ophioglossaceae inside Filicales. Fern spores from lower herbaceous flora	Example of extant Helminthostachys specimens, Lycopodiacidites come probably from similar genera or maybe an species from the genus
Contignisporites	Contignisporites dunrobinensis Contignisporites problematicus				Affinities with the Pteridaceae inside Polypodiopsida. Forest Ferns from humid ground locations	Example of extant Pityrogramma specimens, Contignisporites and Manumia come probably from similar genera or maybe an species from the genus
Auritulinasporites	Auritulinasporites scanicus Auritulinasporites triclavis				Affinities with the Gleicheniales inside Polypodiopsida. Fern spores from lower herbaceous flora	Example of extant Gleichenia specimens, Gleicheniidites and Auritulinasporites come probably from similar genera or maybe an species from the genus
Gleicheniidites	Gleicheniidites senonicus Gleicheniidites umbonatus
Dictyophyllidites	Dictyophyllidites harrisii				Affinities with the Dipteridaceae inside Gleicheniales. Fern spores from lower herbaceous flora	Example of extant Dipteris specimens, Dictyophyllidites come probably from similar genera or maybe an species from the genus
Marattisporites	Marattisporites scabratus				Affinities with the Marattiaceae inside Polypodiopsida. Fern spores from lower herbaceous flora	Example of extant Marattia specimens, Marattisporites come probably from similar genera
Matonisporites	Matonisporites crassiangulatus Matonisporites sp.				Affinities with the Matoniaceae inside Polypodiopsida. Fern spores from lower herbaceous flora	Example of extant Matonia specimens, Matonisporites come probably from similar genera
Osmundacidites	Osmundacidites wellmanii				Affinities with the family Osmundaceae inside Polypodiopsida. Near Fluvial currents ferns, reted to the modern Osmunda Regalis.	Example of extant Osmunda specimens, Osmundacidites and Baculatisporites come probably from similar genera or maybe an species from the genus
Baculatisporites	Baculatisporites comaumensis
Todisporites	Todisporites granulatus Todisporites major Todisporites minor
Cibotiumspora	Cibotiumspora jurienensis				Affinities with the family Cyatheaceae inside Cyatheales. Arboreal Fern Spores	Example of extant Cyathea, Zebrasporites and Cibotiumspora come probably from similar genera
Zebrasporites	Zebrasporites interscriptus
Enzolasporites	Enzolasporites manifestus Enzolasporites vigens
Cyathidites	Cyathidites australis Cyathidites concavus Cyathidites minor
Brachysaccus	Brachysaccus microsaccus			Pollen	Incertade sedis Affinities with the Gymnospermophyta
Alisporites	Alisporites robustus				Affinities with the families Umkomasiaceae, Peltaspermaceae and Corystospermaceae inside Peltaspermales. Possible seed Fern Pollen
Protopinus	Protopinus scanicus Protopinus sp. sp nov				Affinities with the families Caytoniaceae inside Caytoniales. Possible seed Fern Pollen
Vitreisporites	Vitreisporites pallidus
Aratisporites	Aratisporites palettae
Eucommiidites	Eucommiidites troedssonii Eucommiidites major				Type Pollen of the Erdtmanithecales, that can be related with the Gnetales.
Chasmatosporites	Chasmatosporites apertus Chasmatosporites elegans Chasmatosporites major Chasmatosporites minor Chasmatosporites rimatus				Affinities with the family Cycadaceae inside Cycadales. Is among the most abundant flora recovered on the upper section of the formation, and was found to be similar to the pollen of the extant Encephalartos laevifolius. On the Toarcian-Aalenian section, at least six species of Chasmatosporites are recovered, playing more than 50% of the total palynological samples, implicating a clear dominant role of the producer of this Pollen. C. minor is present more on sandy brackish facies, while C. major is found more on brackish-marine facies.	Extant Encephalartos laevifolius. Chasmatosporites maybe come from a related plant
Ginkgocycadophytus	Ginkgocycadophytus nitidus Ginkgocycadophytus sp.				Affinities with the Ginkgoaceae inside Ginkgoales.
Entylissa	Entylissa pyriformis Entylissa reticulata Entylissa tecta				Affinities with the Palissyaceae inside Pinopsida.
Classopollis	Classopollis classoides				Affinities with the Cheirolepidiaceae inside Pinopsida.
Spheripollenites	Spheripollenites subgranulatus
Cerebropollenites	Cerebropollenites mesozoicus				Affinities with the family Pinaceae inside Pinopsida. Conifer pollen from medium to large arboreal plants	Extant Picea. Cerebropollenites and Pinuspollenites maybe come from a related plant
Ovalipollis	Ovalipollis ovalis
Pinuspollenites	Pinuspollenites globosaccus Pinuspollenites minimus
Pityosporites	Pityosporites nigraeformis Pityosporites scaurus
Parvisaccites	Parvisaccites enigmatus	Affinities with the Podocarpaceae inside Pinopsida. Conifer pollen from medium to large arboreal plants	Extant Podocarpus. Podocarpidites and Parvisaccites maybe come from a related plant
Podocarpidites	Podocarpidites ellipticus Podocarpidites sp.
Exesipollenites	Exesipollenites tumulus	Affinities with the family Cupressaceae inside Pinopsida. Pollen that resembles extant genera such as the Genus Actinostrobus and Austrocedrus, probably derived from Dry environments.	Extant Austrocedrus. Exesipollenites and Perinopollenites maybe come from a related plant
Perinopollenites	Perinopollenites elatoides
Callialasporites	Callialasporites dampieri Callialasporites turbatus	Affinities with the family Araucariaceae inside Pinales. Conifer Pollen from medium to large Arboreal Plants	Extant Araucaria. Araucariacites and Callialasporites maybe come from a related plant
Araucariacites	Araucariacites australis

Plant Macrofossils

Genus	Species	Stratigraphic position	Member	Material	Notes	Images
Coniopteris	Coniopteris hymenophylloides	West of Heiligendamm	Katslösa Member	Single Leaflet	A fern of the family Polypodiidae inside Polypodiopsida. Similar to Sphenopteris species of Permian rocks of the same region	Specimen
Ginkgoites	Ginkgoites acosmia			Single Leaf Impression	A member of the family Ginkgoaceae inside Ginkgoales. The shape and the clearly visible bifurcation of the veins agrees with the referal to the genus Ginkgoites
Marchantiolites	Marchantiolites cf. porosus			Almost complete thallus of a liverwort	A member of the family Marchantiaceae inside Hepatophyta. Suggested initially to be an angiosperm leaf. Like extant Marchantia polymorpha, mostly blackish stripes appear along the midrib of the thallus.	Extant Marchantia polymorpha

See also

• List of fossiliferous stratigraphic units in Sweden
• Kristianstad Basin
• Toarcian formations

• Djupadal Formation, Central Skane
• Marne di Monte Serrone, Italy
• Calcare di Sogno, Italy
• Sachrang Formation, Austria
• Saubach Formation, Austria
• Posidonia Shale, Lagerstätte in Germany
• Ciechocinek Formation, Germany and Poland
• Krempachy Marl Formation, Poland and Slovakia
• Lava Formation, Lithuania

References

Bibliography

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External links

Media related to Rya Formation at Wikimedia Commons