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Koluel Kaike Formation | |
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Stratigraphic range: Lutetian (Casamayoran-Mustersan) ~ | |
Underlies | Sarmiento Formation Gaiman Formation |
Thickness | 319 metres |
Lithology | |
Primary | Sandstone, mudstone |
Other | Limestone |
Location | |
Country | Argentina |
Extent | Golfo San Jorge Basin |
Type section | |
Location | Sarmiento Department, Chubut |
Region | Chubut Province |
Country | Argentina |
Thickness at type section | 319 metres (1,047 ft) (tuffs) |
The Koluel Kaike Formation is a geological formation in Chubut Province, Argentina which spans around 50 to 47.1 million years ago from the Early to Middle Eocene.It predominantly consists of pyroclastic deposits[1], which were deposited in a semi-arid environment.[2] It is divided up into a number of members.[1] The diverse fauna of the Sarmiento Formation, including a variety of freshwater fish, crocodilians, turtles and snakes, also includes many mammals such as South American native ungulates (notoungulates, litopterns, astrapotheres) as well as armadillos, and caviomorph rodents.[3]
The Sarmiento Formation overlies the Casamayor Formation and forms the most recent sequence of the stratigraphic section. The formation is named for the town of Sarmiento
Color key
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Notes Uncertain or tentative taxa are in small text; |
Name | Species | Member/Locality | Material | Notes | Image |
---|---|---|---|---|---|
Name | Species | Member | Material | Notes | Image |
---|---|---|---|---|---|
Trichodactylidae indet. | Vergel Member |
Name | Species | Member | Material | Notes | Image |
---|---|---|---|---|---|
Agassizia | A. excentrica | Cocuiza Member | |||
Arbacia | A. punctulata | Cocuiza Member | |||
Encope | E. cf. emarginata | Cocuiza Member | |||
Encope | E. secoensis | Cocuiza Member | |||
Mellitella | M. falconensis | Cocuiza Member | |||
Moira | M. atropos | Cocuiza Member |
Name | Species | Member | Material | Notes | Image |
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Name | Species | Member | Material | Notes | Image |
---|---|---|---|---|---|
Anura indet. | Vergel Member | isolated cranial and postcranial elements | |||
cf. Pipa | cf. P. sp. | Vergel Member | sacral vertebrae fused to a partial urostyle |
Name | Species | Member | Material | Notes | Image |
---|---|---|---|---|---|
Eocaiman[4] | E. cavernensis | Gran Barranca Member | |||
Sebecus[5] | S. icaeorhinus | Gran Barranca Member | Disarticulated skull, mandible, and some postcranial material. | A sebecid notosuchian. |
Name | Species | Member | Material | Notes | Image |
---|---|---|---|---|---|
Gaffneylania[6] | G. auricularis | A meiolaniid stem-turtle | |||
Niolamia | N. argentina | Gran Barranca Member |
Name | Species | Member/Locality | Material | Notes | Image |
---|---|---|---|---|---|