The Pollen Evidence for the Environment of Early Man and Extinct Mammals at the Lehner Mammoth Site, Southeastern Arizona

Abstract
Fossil pollen is directly associated with a radiocarbon date, mammoth bones, and the same stratigraphic units in which mammoth, bison, tapir, and horse bones and Clovis artifacts were recovered at the Lehner site. The pollen evidence indicates that desert grassland occupied the San Pedro Valley of southeastern Arizona about 9000 B.C.