EXAMINATION OF FOUR FEATURES FOR POLLEN TO DETERMINE HISTORIC OR PREHISTORIC ORIGIN, ARIZONA

Four sanples from AZ U:9:112 (ASM) were examined to identify whether or not
three of the four features represented were modern or prehistoric. Features are
located within an alfalfa field. The fourth sample represents a Classic Period
canal and was examined to provide baseline information with which to compare the
other three features. Presence of Medicaao (alfalfa) pollen was soiaght as the
only obvious evidence of contamination. If the features represent historic
origin during a period of cultivation, one would also expect to see a change in
pollen frequencies with more weedy plants associated with agriculture
represented.