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La Colonia Formation

Geological formation in Argentina From Wikipedia, the free encyclopedia

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The La Colonia Formation is a geological formation in Argentina whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.[1]

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Originally thought to be Campanian (c.73-72 million years ago) in age or earlier, studies of underlying formations have made a Maastrichtian (7266 million years ago) age more likely.[2]

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Description

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Paleogeography of the Late Cretaceous with La Colonia Formation indicated

It is divided up into three distinct facies, the first is up to 16 metres (52 ft) thick and consists of conglomerate, the second is by far the thickest at over 100 metres (330 ft), consists of siltstone and claystone, with interbeds of claystone/shale and sandstone, the third is less than 10 metres (33 ft) thick and consists of clay, and probably represents a nearshore marine environment.[3]

The paleoflora was known for its aquatic components, Paleoazolla and Regnellidium. However, recent paleobotanical discoveries at the Cañadón del Irupé locality have revealed the presence of a more diverse range of plants associated with these water bodies, including pteridophytes, gymnosperms, and various angiosperms. Among these are fossil leaves and fruits assignable to Nelumbonaceae.[4]

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Fossil content

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Restoration of La Colonia Formation
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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.

Turtles

More information Turtles from the La Colonia Formation, Genus ...

Fish

More information Fish from the La Colonia Formation, Genus ...

Plesiosaurs

More information Plesiosaurs from the La Colonia Formation, Genus ...

Dinosaurs

Ornithischians

More information Ornithischians from the La Colonia Formation, Genus ...

Sauropods

More information Sauropods from the La Colonia Formation, Genus ...

Theropods

More information Theropods from the La Colonia Formation, Genus ...

Mammals

Over 300 mammal specimens have been found in the La Colonia Formation.[18]

More information Mammals of the La Colonia Formation, Genus ...

Snakes

Fossils of madtsoiids, and perhaps boids, have been found in the formation.[22]

More information Snakes from the La Colonia Formation, Genus ...
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See also

References

Further reading

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