North American land mammal age
Geologic timescale for North American fauna beginning during the Late Cretaceous / From Wikipedia, the free encyclopedia
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The North American land mammal ages (NALMA) establishes a geologic timescale for North American fauna beginning during the Late Cretaceous and continuing through to the present. These periods are referred to as ages or intervals (or stages when referring to the rock strata of that age) and were established using geographic place names where fossil materials were obtained.[1]