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Revision as of 02:27, 16 November 2013 by Dysmorodrepanis~enwiki (talk | contribs) (+fossil)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)| Lopez de Bertodano Formation | |
|---|---|
| Stratigraphic range: Maastrichtian 70 to 66 Ma | |
| Type | Geological formation |
| Unit of | Marambio Group |
| Overlies | Snow Hill Island Formation |
| Lithology | |
| Primary | siltstone, mudstone |
| Other | concretion, sandstone |
| Location | |
| Region | James Ross Island group, Antarctica |
The Lopez de Bertodano Formation is a geological formation in the James Ross archipelago of the Antarctic Peninsula. The strata date to the end of the Late Cretaceous (upper-lower Maastrichtian stage), about 70-66 million years ago. Dinosaur remains are among the fossils that have been recovered from the formation and include at least two and probably as much as six lineages of undisputably modern birds: one related to waterfowl, a primitive shorebird or related form, 1-2 species of possible loons, a large and possibly flightless bird belonging to a lineage extinct today as well as a partial skull that might belong to either of the smaller species or represent yet another one.
| Dinosaurs of the Lopez de Bertodano Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Unit | Material | Notes | Images |
|
P. gregorii |
Lower Sandwich Bluff Member |
Partial skull and skeleton, holotype |
A loon? |
||
|
P.? sp. |
Lower Sandwich Bluff Member |
Partial skeleton including wing and hindlimbs |
Possibly a more primitive form with strong flight ability and lighter bones | ||
|
V. iaai |
Lower Sandwich Bluff Member |
Partial skeleton, holotype |
An anseriform | ||
|
Undescribed Cariamae |
Unnamed species |
Cape Lamb Member |
Isolated femur |
Close relative of cariamids and phorusrhacids | |
|
Undescribed charadriiform |
Unnamed species |
Cape Lamb Member |
Partial skeleton |
||
|
Unidentified Neornithes |
Unnamed species |
Partial skull |
Relationships undetermined, cranium some 5-6 cm long. | ||
|
Undescribed euornithopod |
Unnamed species |
||||
|
Undescribed hadrosaurid |
Unnamed species |
Isolated tooth |
|||
|
Undescribed theropod |
Unnamed species |
Fragments |
|||
See also
References
- ^ Olivero, E.B., Ponce, J.J., Marsicano, C.A. and Martinioni, D.R. (2007). "Depositional settings of the basal Lopez de Bertodano Formation, Maastrichtian, Antarctica." Revista de la Asociación Geológica Argentina, 62(4): 521-529.
- ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, Antarctica)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. p. 606. ISBN 0-520-24209-2.
- Clarke, J.A., Tambussi, C.P., Noriega, J.I., Erickson, G.M. and Ketcham, R.A. (2005). "Definitive fossil evidence for the extant avian radiation in the Cretaceous." Nature, 433: 305-308. DOI:10.1038/nature03150 PDF fulltext Supporting information
- Case, J., Reguero, M., Martin, J. and Cordes-Person, A. (2006). "A cursorial bird from the Maastrictian of Antarctica." Journal of Vertebrate Paleontology, 26(3): 48A.
- Cordes, (2002). "A new charadriiform avian specimen from the Early Maastrichtian of Cape Lamb, Vega Island, Antarctic Peninsula". Journal of Vertebrate Paleontology, 22(3): 46A.
- NUEVOS RESTOS DE DINOSAURIA DEL CRETÁCICO DE LAS ISLAS JAMES ROSS Y MARAMBIO, PENÍNSULA ANTÁRTICA
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