Summary: Reviewof Palaeobotanyand Palynology,68 (1991): 1-28 1
Elsevier Science Publishers B.V., Amsterdam
Comparison of pollen and macrofossils in packrat (Neotoma)
middens: A chronological sequence from the Waterman
Mountains of southern Arizona, U.S.A.
R. Scott Anderson a and Thomas R. Van Devender b
aQuaternary Studies and Environmental Sciences Programs, Bilby Research Center, Northern Arizona University,
Flagstaff, AZ 86011, U.S.A.
bArizona-Sonora Desert Museum, 2021 N. Kinney Road, Tucson, AZ 85743, U.S.A.
(Received April 25, 1990; revised and accepted November 27, 1990)
Anderson, R.S. and Van Devender, T.R., 1991. Comparison of pollen and macrofossils in packrat (Neotoma)middens: A
chronological sequence from the Waterman Mountains of southern Arizona, U.S.A. Rev. Palaeobot. Palynol., 68: 1-28.
Pollen percentages in moss polsters and soil samples were compared with percent plant cover along 30-m transects in
desertscrub vegetation, Waterman Mountains, Arizona, in the northeastern Sonoran Desert. These data were used to interpret
pollen assemblages and associated plant macrofossils from 14 packrat (Neotomasp.) middens radiocarbon dated from 1320
to 22,450yr B.P.
A macrofossil:pollen index (MPI) was used to compare the presence and relative abundances of pollen and macrofossils in
midden samples. In general, pollen and macrofossils from Sonoran Desert middens reflectsimilar vegetation signals. Calculation
of S~rensen's Similarity Index (S1) comparing the presence or absence of midden pollen and macrofossils indicates greater