Lopez de Bertodano Formation - AbsoluteAstronomy.com

The Lopez de Bertodano Formation is a geological formation in the James Ross archipelago

James Ross Island

James Ross Island is a large island off the southeast side and near the northeastern extremity of Antarctic Peninsula, from which it is separated by Prince Gustav Channel. Rising to , it is irregularly shaped and extends in a north-south direction. It was charted in October 1903 by the Swedish...

of the Antarctic Peninsula

Antarctic Peninsula

The Antarctic Peninsula is the northernmost part of the mainland of Antarctica. It extends from a line between Cape Adams and a point on the mainland south of Eklund Islands....

. The strata date to the end of the Late Cretaceous

Late Cretaceous

The Late Cretaceous is the younger of two epochs into which the Cretaceous period is divided in the geologic timescale. Rock strata from this epoch form the Upper Cretaceous series...

(upper-lower Maastrichtian

Maastrichtian

The Maastrichtian is, in the ICS' geologic timescale, the latest age or upper stage of the Late Cretaceous epoch or Upper Cretaceous series, the Cretaceous period or system, and of the Mesozoic era or erathem. It spanned from 70.6 ± 0.6 Ma to 65.5 ± 0.3 Ma...

stage), about 70-65 million years ago. Dinosaur remains are among the fossils that have been recovered from the formation.

Dinosaur Dinosaur Dinosaurs are a diverse group of animals of the clade and superorder Dinosauria. They were the dominant terrestrial vertebrates for over 160 million years, from the late Triassic period until the end of the Cretaceous , when the Cretaceous–Paleogene extinction event led to the extinction of... s of the Lopez de Bertodano Formation
Genus	Species	Unit	Material	Notes	Images
Polarornis Polarornis Polarornis is a genus of prehistoric bird, possibly a loon. It contains a single species Polarornis gregorii known from incomplete remains of one individual found on Seymour Island, Antarctica, in rocks which are dated to the Late Cretaceous .The discovery of Polarornis gregorii was first announced...	P. gregorii	Lower Sandwich Bluff Member	Partial skull and skeleton, holotype Holotype A holotype is a single physical example of an organism, known to have been used when the species was formally described. It is either the single such physical example or one of several such, but explicitly designated as the holotype...	A loon Gaviiformes Gaviiformes is an order of aquatic birds containing the loons or divers and their closest extinct relatives. Modern gaviiformes are found in many parts of North America and northern Eurasia , though prehistoric species were more widespread.-Classification and evolution:There are five living...
	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 Vegavis Vegavis is a genus of extinct bird that lived during the Late Cretaceous of Antarctica, some 65 mya. It belonged to the clade Anseriformes...	V. iaai	Lower Sandwich Bluff Member	Partial skeleton, holotype Holotype A holotype is a single physical example of an organism, known to have been used when the species was formally described. It is either the single such physical example or one of several such, but explicitly designated as the holotype...	An anseriform
Undescribed Cariamae Cariamae Cariamae is a suggested name for a group of primarily flightless birds that have been around for 63 million years. The group includes the families Cariamidae, Phorusrhacidae, Bathornithidae, Idiornithidae and Ameghinornithidae...	Unnamed species	Cape Lamb Member	Isolated femur	Close relative of cariamids and phorusrhacids
Undescribed charadriiform	Unnamed species	Cape Lamb Member	Partial skeleton
Undescribed euornithopod	Unnamed species
Undescribed hadrosaurid Hadrosaurid Hadrosaurids or duck-billed dinosaurs are members of the family Hadrosauridae, and include ornithopods such as Edmontosaurus and Parasaurolophus. They were common herbivores in the Upper Cretaceous Period of what are now Asia, Europe and North America. They are descendants of the Upper...	Unnamed species		Isolated tooth
Undescribed theropod	Unnamed species		Fragments

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