Lopez de Bertodano Formation: Difference between revisions

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Revision as of 02:27, 16 November 2013 editDysmorodrepanis~enwiki (talk \| contribs)Autopatrolled, Pending changes reviewers75,259 edits +fossil← Previous edit		Revision as of 10:22, 18 December 2014 edit undoJohn of Reading (talk \| contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers768,040 editsm Typo/general fixing, replaced: undisputably → indisputably using AWB Next edit →
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	The '''Lopez de Bertodano Formation''' is a geological ] in the ] of the ]. The strata date to the end of the ] (upper-lower ] stage<ref name=deposition>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.</ref>), about 70-66 million years ago. Dinosaur remains are among the fossils that have been recovered from the formation<ref name="cretaceousdistribution">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.</ref> and include at least two and probably as much as six lineages of ~~undisputably~~ ]: one related to ], a primitive ] or related form, 1-2 species of possible ]s, a large and possibly flightless bird belonging to a lineage extinct today<!-- need to determine wether this was not a Pelagornithidae --> as well as a partial skull that might belong to either of the smaller species or represent yet another one.		The '''Lopez de Bertodano Formation''' is a geological ] in the ] of the ]. The strata date to the end of the ] (upper-lower ] stage<ref name=deposition>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.</ref>), about 70-66 million years ago. Dinosaur remains are among the fossils that have been recovered from the formation<ref name="cretaceousdistribution">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.</ref> and include at least two and probably as much as six lineages of indisputably ]: one related to ], a primitive ] or related form, 1-2 species of possible ]s, a large and possibly flightless bird belonging to a lineage extinct today<!-- need to determine wether this was not a Pelagornithidae --> as well as a partial skull that might belong to either of the smaller species or represent yet another one.

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Revision as of 10:22, 18 December 2014

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 indisputably 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
Polarornis	P. gregorii	Lower Sandwich Bluff Member	Partial skull and skeleton, holotype	A loon?
Polarornis	P.? sp.	Lower Sandwich Bluff Member	Partial skeleton including wing and hindlimbs	Possibly a more primitive form with strong flight ability and lighter bones
Vegavis	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

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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Revision as of 10:22, 18 December 2014

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References