Siamaná Formation
Siamaná Formation | |
---|---|
Stratigraphic range: Mid-Late Oligocene ~ | |
Type | Geological formation |
Unit of | Cocinetas Basin |
Underlies | Uitpa Formation |
Overlies | Macarao Formation |
Thickness | 430 m (1,410 ft) |
Lithology | |
Primary | Conglomerate |
Other | Limestone |
Location | |
Coordinates | 11°58′00″N 71°22′43″W / 11.96667°N 71.37861°W |
Region | La Guajira Caribbean region |
Country | Colombia |
Type section | |
Named for | Siamaná |
Named by | Renz |
Location | Uribia |
Year defined | 1960 |
Coordinates | 11°58′00″N 71°22′43″W / 11.96667°N 71.37861°W |
Region | La Guajira |
Country | Colombia |
Type locality of the formation in La Guajira |
The Siamaná Formation (Spanish: Formación Siamaná, E3s) is a fossiliferous geological formation of the Cocinetas Basin in the northernmost department of La Guajira. The formation consists of conglomerates and limestones. The Siamaná Formation dates to the Paleogene period; Middle to Late Oligocene epoch, corresponding to the Deseadan in the SALMA classification.
Etymology
The formation was defined by Renz in 1960 and named after the village of Siamaná.[1]
Description
Lithologies
The Siamaná Formation consists of conglomerates and thick carbonates.[2]
Stratigraphy and depositional environment
The Siamaná Formation, with a maximum thickness of 430 metres (1,410 ft), overlies the Macarao Formation and is overlain by the Uitpa Formation. The age has been estimated to be Middle to Late Oligocene, corresponding to the Deseadan in the SALMA classification. The depositional environment has been interpreted as shallow marine.[3]
Petroleum geology
The Siamaná Formation is a reservoir and seal rock formation in the Guajira Basin.[4]
Fossil content
Group | Fossils | Notes |
---|---|---|
Invertebrates | Mimachlamys canalis, Ostrea sp. |
See also
- Geology of the Eastern Hills
- Cesar-Ranchería Basin
- Honda Group
- Abanico, Castillo, Chota, Loreto, Soncco, Usme Formations
- Tinguiririca fauna
References
Bibliography
Local geology
Paleontology
Maps
- Geologic formations of Colombia
- Paleogene Colombia
- Oligocene Series of South America
- Chattian Stage
- Deseadan
- Conglomerate formations
- Limestone formations
- Shallow marine deposits
- Reservoir rock formations
- Seal rock formations
- Fossiliferous stratigraphic units of South America
- Paleontology in Colombia
- Geography of La Guajira Department