Fossils display puzzling loss of evolution right through ultimate ice age top

Studies of tens of 1000’s of fossils from the La Brea tar pits in California have discovered no transparent proof of any of the species evolving in reaction to falling temperatures as ice sheets unfold around the continent, or to the later warming when the glacial duration ended.

“They’re not fluctuating with climate change like so many biologists believe that everything must do,” says Donald Prothero at California State Polytechnic University in Pomona. “They’re static, despite obvious evidence of climate change at 20,000 years ago.”