This study of 23 pollen samples allows recognition of a sequence of ecosystem changes occurring in central New Mexico between A.D. 1280 and 1400 and also in the 1650 - 1750 period. It also discusses the effects of such changes on aboriginal maize agriculture. Draft of the report included in Archaeological Excavations at Pueblo del Encierro.

Draft of an article submitted for publication in, "Plateau." Suggests discrepancies between pollen cross-dating and ceramic cross-dates with tree rings may be the expected consequence of difference between the time pollen is deposited in a sample and the duration of the use-lifes of ceramic styles associated with the sample. Rejected by reviewers.