UCSB has an informational page about the former bay area coastline [1]. In general, we have excellent models of the late Pleistocene coastline changes for most

UCSB has an informational page about the former bay area coastline [1]. In general, we have excellent models of the late Pleistocene coastline changes for most of the west coast and the ease of access from major universities means there's been a lot of surveying, especially in places like the channel islands. Our understanding of the first settlers is immensely better than our understanding of their immediate ancestors because we've found so little in Siberia/Alaska/Northeast Asia. One of the big issues holding back progress has been the difficulty of improving the glaciation model resolution, which has become increasingly important as the evidence builds that humans entered the new world pretty much as soon as it was possible rather than waiting for conditions to be "easy" (read: still incredibly hostile). [1] https://animations.geol.ucsb.edu/2_infopgs/IP2IceAge/cSFBayFlood.html https://animations.geol.ucsb.edu/2_infopgs/IP2IceAge/cSFBayF...