A partial skeleton of a primitive bird, Rahona ostromi, gen. et sp. nov., has been discovered
from the Late Cretaceous of Madagascar. This specimen, although exhibiting avian features …

WE report here the discovery of a primitive dinosaur skeleton from Upper Triassic strata in
northwestern Argentina. The 1-m-long skeleton represents a new taxon, Eoraptor lunensis …

We describe the osteology of the new small theropod dinosaur Masiakasaurus knopfleri,
from the Late Cretaceous Maevarano Formation of northwestern Madagascar …

Theropods have traditionally been assumed to have lost manual digits from the lateral side
inward, which differs from the bilateral reduction pattern seen in other tetrapod groups. This …

40Ar/39Ar dating of sanidine from a bentonite interbedded in the Ischigualasto Formation of
northwestern Argentina yielded a plateau age of 227.8±0.3 million years ago. This middle …

Recent discoveries of fossil vertebrates from the Late Cretaceous of Madagascar include
several specimens of a large theropod dinosaur. One specimen includes a nearly complete …

The tyrannosauroid fossil record is mainly restricted to Cretaceous sediments of Laurasia,
although some very fragmentary Jurassic specimens have been referred to this group,. Here …

The Titanosauria, the last surviving group of the giant sauropod dinosaurs, attained a near-
global distribution by the close of the Cretaceous period (65 Myr ago). With the exception of …

Background During much of the Late Cretaceous, a shallow, epeiric sea divided North
America into eastern and western landmasses. The western landmass, known as Laramidia …

The fossil record of Jurassic theropod dinosaurs closely related to birds remains poor. A new
theropod from the earliest Late Jurassic of western China represents the earliest diverging …