Winton Formation

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Winton Formation
Stratigraphic range: Late Albian-Early Turonian
~104–92 Ma
TypeGeological formation
Unit ofRolling Downs Group
UnderliesUnconformity with Quaternary Lake Eyre Basin sediments
OverliesMackunda Formation,[1] Oodndatta Formation
Thickness<100 m (330 ft) at the margin
1,200 m (3,900 ft) in the centre
Lithology
PrimarySandstone, siltstone, claystone
OtherConglomerate, coal
Location
RegionQueensland
Country Australia
ExtentEromanga Basin
Type section
Named forWinton, Queensland
Named byWhitehouse
LocationBores in and around Winton
Year defined1955
Winton formation.svg
Formation distribution within Australia

The Winton Formation is a Cretaceous formation in central-western Queensland, Australia. It is late Albian to early Turonian in age.[2]

The formation is a rock unit that blankets large areas of central-western Queensland. It consists of sedimentary rocks such as sandstone, siltstone and claystone. The sediments that make up these rocks represent the remnants of the river plains that filled the basin left by the Eromanga Sea - an inland sea that covered large parts of Queensland and central Australia at least four times during the Early Cretaceous. Great meandering rivers, forest pools and swamps, creeks, lakes and coastal estuaries all left behind different types of sediment.

In some areas, the Winton Formation is over 400 metres thick. To bring with them such a huge amount of sediment, the rivers that flowed across these plains must have been comparable in size to the present-day Amazon or Mississippi rivers. As more and more sediment was brought in, the margins of the inland sea slowly contracted. By around 95 million years ago, the deposition was complete and the inland sea would never be seen again.

By virtue of its age and the environmental conditions under which the rocks it consists of were deposited, the Winton Formation represents one of the richest sources of dinosaur fossils anywhere in Australia.

Fauna[edit]

A fossil footprint-(ichnite), Wintonopus, found with two other dinosaur genera footprints at the Lark Quarry in Australia, c.f. Tyrannosauropus and Skartopus, have been found in the Winton Formation. The crocodyliform Isisfordia duncani was also found.[3][4]

Dinosaurs of the Winton Formation
Taxa Species Presence Material Notes Images

Australovenator [5]

A. wintonensis Partial skeleton A lightweight predatory megaraptoran theropod 6 meters (20 ft) long.[6][7][8]
Wintonotitan [5] W. wattsi[5] Partial skeleton A giant herbivorous titanosaurian sauropod.[6]

Diamantinasaurus [5]

D. matildae[5] Partial skeleton A giant, stocky herbivorous titanosaurian sauropod about 15–16 metres (49–52 ft) in length.[6]

Austrosaurus[9]

A. mckillopi

Savannasaurus [10]

S. elliotorum[10] Partial skeleton A giant herbivorous titanosaurian sauropod about 15 metres (49 ft) in length.[11]
Wintonopus Indeterminate Tracks

Ornithischia[9]

Indeterminate
Neornithischia Indeteriminate Tooth[12]

Saurischia[9]

Indeterminate

Sauropoda[9]

Indeterminate Tracks
Ankylosauria[13] Indeterminate 3 Isolated teeth from left and right dentary and right maxilla

See also[edit]

References[edit]

  1. ^ http://www.anra.gov.au/topics/water/availability/qld/gmu-winton-mackunda-formations.html
  2. ^ Tucker, Ryan T.; Roberts, Eric M.; Hu, Yi; Kemp, Anthony I.S.; Salisbury, Steven W. (September 2013). "Detrital zircon age constraints for the Winton Formation, Queensland: Contextualizing Australia's Late Cretaceous dinosaur faunas". Gondwana Research. 24 (2): 767–779. doi:10.1016/j.gr.2012.12.009. ISSN 1342-937X.
  3. ^ "Missing link crocodile found down under". Science Buzz. Science Museum of Minnesota. 18 June 2006. Retrieved 11 July 2013.
  4. ^ "Ancestor of all modern crocodilians discovered in outback Queensland". The University of Queensland. 14 June 2006. Retrieved 11 July 2013.
  5. ^ a b c d e Hocknull, SA; White, MA; Tischler, TR; Cook, AG; Calleja, ND; et al. (2009). "New Mid-Cretaceous (Latest Albian) Dinosaurs from Winton, Queensland, Australia". PLoS ONE. 4 (7): e6190. doi:10.1371/journal.pone.0006190. PMC 2703565. PMID 19584929.
  6. ^ a b c "Scientists Find Dinosaur That Lived 98M Years Ago in Australia". Associated Press. Fox News. 3 July 2009. Retrieved 3 July 2009.
  7. ^ "New dinosaurs found in Australia". BBC News. 3 July 2009. Retrieved 3 July 2009.
  8. ^ "Triple Fossil Find Puts Australia Back On The Dinosaur Map". Science Daily. 3 July 2009. Retrieved 3 July 2009.
  9. ^ a b c d Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, Australasia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 605-606. ISBN 0-520-24209-2.
  10. ^ a b Poropat, S.F.; Mannion, P.D.; Upchurch, P.; Hocknull, S.A.; Kear, B.P.; Kundrát, M.; Tischler, T.R.; Sloan, T.; Sinapius, G.H.K.; Elliott, J.A.; Elliott, D.A. (2016). "New Australian sauropods shed light on Cretaceous dinosaur palaeobiogeography". Scientific Reports. 6: 34467. doi:10.1038/srep34467. PMC 5072287. PMID 27763598.
  11. ^ Geggel, Laura (2016). "Wide-Hipped Dinosaur the Size of a Bus Once Trod Across Australia". Live Science. Purch.
  12. ^ "Hypsilophodontid (Dinosauria:Ornithischia) from latest Albian, Winton Formation, central Queensland". Memoirs of the Queensland Museum. 52.
  13. ^ Leahey, Lucy G.; Salisbury, Steven W. (June 2013). "First evidence of ankylosaurian dinosaurs (Ornithischia: Thyreophora) from the mid-Cretaceous (late Albian–Cenomanian) Winton Formation of Queensland, Australia". Alcheringa: An Australasian Journal of Palaeontology. 37 (2): 249–257. doi:10.1080/03115518.2013.743703. ISSN 0311-5518.