The Wisconsinan Ice Age
The fossils found at La Brea, lived during the climatic global cooling called the Wisconsinan Ice Age. This ice age produced climatic changes which are believed to have been a major factor in the extinctions of the large mammals found as fossils at La Brea. For 30,000 years of fossil record, recorded at La Brea, life seems to have flourished. The tar pits have recorded an incredibly large range in diversity of the fossils which existed from 40,000 up to 11,000 years ago.