Asteroceras Blakei
''Asteroceras'' is an extinct genus of cephalopod belonging to the Ammonite subclass. These fast-moving nektonic carnivores lived during the Triassic and Jurassic periods (from 205.6 to 189.6 Ma). Species *''Asteroceras blakei'' Spath, 1925 *''Asteroceras confusum'' Spath, 1925 *''Asteroceras obtusum'' (Sowerby, 1817) *''Asteroceras reynesi'' Fucini, 1903 *''Asteroceras saltriensis'' Parona, 1896 *''Asteroceras smithii'' (Sowerby, 1814) *''Asteroceras stellare'' (Sowerby 1815) *''Asteroceras turneri'' (Sowerby, 1814) Paleobiology Database - Asteroceras
2014-05-29.

Distribution

''Asteroceras'' fossils may be found in the Jurassic marine strata of Canada, China, Germany, Hong Kong, Hungary, Peru, and Turkey, in the Triassic of United States an ...
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Late Triassic
The Late Triassic is the third and final epoch (geology), epoch of the Triassic geologic time scale, Period in the geologic time scale, spanning the time between annum, Ma and Ma (million years ago). It is preceded by the Middle Triassic Epoch and followed by the Early Jurassic Epoch. The corresponding series (stratigraphy), series of rock beds is known as the Upper Triassic. The Late Triassic is divided into the Carnian, Norian and Rhaetian Geologic time scale, Ages. Many of the first dinosaurs evolved during the Late Triassic, including ''Plateosaurus'', ''Coelophysis'', and ''Eoraptor''. The Triassic–Jurassic extinction event began during this epoch and is one of the five major mass extinction events of the Earth. Etymology The Triassic was named in 1834 by Friedrich August von Namoh, Friedrich von Alberti, after a succession of three distinct rock layers (Greek meaning 'triad') that are widespread in southern Germany: the lower Buntsandstein (colourful sandstone'')'', t ...
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