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40 million years ago
They started appearing in the Cenozoic period.

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When do small mammals appear in fossil records?

During the KT extinction event the majority of life on earth became extinct. Small mammals, however, were able to survive this mass extinction.


Are fossils records complete or incomplete?

Fossil records are not complete. By some estimates, less than 1% of organisms that have lived appear in the fossil record.


When did dolphins appear on earth?

Fossil records suggest that dolphins evolved around 10-15 million years ago during the Miocene epoch. They are believed to have evolved from land-dwelling mammals that returned to the sea.


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What has the author Mietje Germonpre written?

Mietje Germonpre has written: 'The Belgian quaternary mammals' -- subject(s): Bibliography, Fossil Mammals, Mammals, Fossil, Paleontology


What has the author William Wise written?

William Wise has written: 'Nanette the hungry pelican' 'The world of giant mammals' -- subject(s): Fossil Mammals, Mammals, Fossil 'The cowboy surprise' 'The terrible trumpet'


What has the author Jin Meng written?

Jin Meng has written: 'The osteology of Rhombomylus (Mammalia, Glires)' -- subject(s): Fossil Mammals, Mammals, Fossil, Paleontology


What mammals appear on planet earth?

Many mammals appear on planet earth. Here are some of them:oxhumanpigmonkeycatdogfoxwolfantelopeelephantpolar bearhorse


What has the author Theodore Elmer White written?

Theodore Elmer White has written: 'The endocrine glands and evolution, no. 3: os cementum, hypsodonty, and diet' -- subject(s): Diet, Fossil Mammals, Mammals, Mammals, Fossil, Teeth 'Additions to the Miocene fauna of north Florida' -- subject(s): Paleontology 'The lower Miocene mammal fauna of Florida' -- subject(s): Fossil Mammals, Geology, Stratigraphic, Mammals, Fossil, Paleontology, Stratigraphic Geology