Cerro Barcino Formation Stratigraphic range: Hauterivian–Campanian |
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Type | Geological formation |
Unit of | Chubut Group |
Sub-units | Puesto Manuel Arce Bayo Overo Las Plumas Cerro Castaño La Paloma |
Underlies | La Colonia Formation, Paso de Sapo Formation, Lefipan Formation |
Overlies | Los Adobes Formation |
Location | |
Region | Chubut Province |
Country | Argentina |
The Cerro Barcino Formation (also known as the Gorro Frigio Formation) is a geological formation in South America whose strata span the mid-late Cretaceous period. Dinosaur remains are among the fossils that have been recovered from the formation.[1]
The Cerro Barcino Formation is the upper unit of the Chubut Group, which also includes the older Los Adobes Formation. Both formations cover a vast area in Chubut Province, Argentina. The two formations are distinguished by geological features suggesting a distinct change in climate, from a wetter, flood plain environment in the Los Adobes to a much more arid, desert-like environment in the Cerro Barcino.[2]
The Cerro Barcino Formation is subdivided into several subunits ("members").[2] From oldest to youngest:
The final three members are likely Albian to Campanian in age (112 to 83 million years ago), while the La Paloma may date to the latest Hauterivian (130ma).[2]
Contents |
Indeterminate abelisaurid remains.[1] Possible indeterminate carcharodontosaurid remains.[1] Indeterminate Titanosauria remains.[1] Also, an unnamed titanosauriform.[1]
Color key
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Notes Uncertain or tentative data are in small text; |
Crocodylomorphs of the Adamantina Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
B. gradilis |
Near El Escorial village, Chubut Province. |
Cerro Castaño Member. |
"Skull, mandible, and postcranial remains." |
A peirosaurid. The first crocodyliform from the Chubut Group. |
Dinosaurs of the Cerro Barcino Formation | |||||
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Genus | Species | Presence | Material | Notes | Images |
Chubutisaurus insignis |
Present in the Bayo Overo Member. |
"[Two] partial skeletons including most limb elements and caudal vertebrae."[4] |
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Genyodectes serus |
Present in the Cerro Castaño Member.[5] |
"Premaxillae, partial dentaries."[6] |
A possible ceratosaurid. |
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"Megalosaurus" |
"Megalosaurus" inexpectatus |
Indeterminate remains originally described as a species of Megalosaurus.[1] |
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Tyrannotitan chubutensis |
Present in the Cerro Castaño Member. |