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The Paleocene is usually broken into Lower and Upper subdivisions. The Faunal stages from youngest to oldest are: Danian/Montian?/(lower Midway) Thanetian/Selandian?/Landenian?/Heersian?/(Upper Midway) |
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On land, plants became quite modern. Paleocene and later plant fossils generally are attributed to modern genera or to closely related taxa. Marine faunas also came to resemble modern faunas with only the marine mammals and the Charcharinid sharks missing. The major area of fast faunal evolution was among the land mammals which -- largely freed from reptile competition for niches -- exploded in size and diversity during the Paleocene. |
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On land, plants became quite modern. Paleocene and later plant fossils generally are attributed to modern genera or to closely related taxa. Marine faunas also came to resemble modern faunas with only the marine mammals and the Charcharinid sharks missing. The major area of fast faunal evolution was among the land mammals which -- largely freed from reptile competition for niches -- exploded in size and diversity during the Paleocene. |
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