|Subdivision of the Cretaceous system|
according to the ICS, as of 2017.
The Early Cretaceous (geochronological name) or the Lower Cretaceous (chronostratigraphic name), is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 146 Ma to 100 Ma.
A large igneous province on the Liaodong Peninsula, China, c. 131–117 Ma lasted for 10 million years. It was the result of the subduction of the Kula and Pacific plates, which was probably caused by a superplume.
During this time many new types of dinosaur appeared or came into prominence, including ceratopsians, spinosaurids, carcharodontosaurids and coelurosaurs, while survivors from the Late Jurassic continued to persist.
A 125 Ma-old boreosphenidan mammal found in the Yixian Formation, China, is one of the oldest mammal fossils found. The fossil location indicates early mammals began to diversify from Asia during the Early Cretaceous. It was related closer to metatherians (marsupials) than eutherians (placentals) and had feet adapted from climbing trees.
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