Late Pleistocene vertebrates from downtown San Francisco, California

absolute age California carbon algae Artiodactyla Eutheria diatoms C-14 Chordata Elephantoidea Elephantidae Bison Bovidae Cenozoic Mammalia isotopes miospores microfossils radioactive isotopes San Francisco California pollen San Francisco County California Plantae Pleistocene Proboscidea Ruminantia Quaternary Tetrapoda Rancholabrean Theria upper Pleistocene United States Vertebrata Mammuthus palynomorphs