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These additions have been used in research related to the Cretaceous–Paleogene extinction event and the ensuing recovery, [6] and to the Anthropocene debate, [5] respectively. However, the ages that stretch into the Cretaceous are sometimes referred to as " North American land vertebrate ages " to reflect the fact that mammals, while still ...
The middle–late Campanian formations show a greater diversity of dinosaurs than any other single group of rocks. The late Maastrichtian rocks contain the largest members of several major clades: Tyrannosaurus, Ankylosaurus, Pachycephalosaurus, Triceratops, and Torosaurus, which suggests food was plentiful immediately prior to the extinction ...
Artist's depiction of the end-Cretaceous impact eventSince the 19th century, a significant amount of research has been conducted on the Cretaceous–Paleogene extinction event, the mass extinction that ended the dinosaur-dominated Mesozoic Era and set the stage for the Age of Mammals, or Cenozoic Era.
Skull of Cronopio. Meridiolestida is an extinct clade of mammals known from the Cretaceous and Cenozoic of South America and possibly Antarctica.They represented the dominant group of mammals in South America during the Late Cretaceous. [1]
Late Cretaceous mammals (3 C, 3 P) E. Early Cretaceous mammals (5 C, 7 P) Σ. Cretaceous mammal stubs (112 P) Pages in category "Cretaceous mammals"
The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after creta, the Latin word for the white limestone known as chalk.
The Cenozoic is also known as the Age of Mammals because the terrestrial animals that dominated both hemispheres were mammals – the eutherians in the Northern Hemisphere and the metatherians (marsupials, now mainly restricted to Australia and to some extent South America) in the Southern Hemisphere. The extinction of many groups allowed ...
A Cenozoic chronology based on mammal taxa has been defined on all the continents except Antarctica. [4]: 939 Because the continents have been separated through most of the Cenozoic, each continent has its own system. [5] Most of the units are based on assemblage zones, layers of strata that contain three or more distinctive fossils.