Take a trip to a time 20,000 to 10,000 years ago when the San Francisco Bay was just a riverbed with this QUEST video provided by KQED. Viewers will be introduced to megafauna that roamed the Bay Area and hypotheses about their extinction. You will explore what the California Bay Area looked like up to 20,000 years ago, discover how Columbian mammoths used Bay Area rocks to maintain their health,  examine the different kinds of animal species that lived in the area during the Pleistocene era.