STRATIGRAPHIC POLLEN ANALYSIS AT 24BH2521

Six stratigraphic samples from a soil profile at 24BH2521 were examined for
pollen. This soil profile exhibits two occupational components, the upper
representing a Besant ocxxipation near AD 200, and the lower representing a
Powers-Ycnkee occupation around 900 BC. Occupation in southeastern Montana
follows a predictable pattern. Prior to AD 100 occupation is infrequent,
increasing in frequency between AD 100 arri AD 700. Occupation then declines
between AD 750 andAD 1100, ceasing for approximately 200 years before cxmtinuing
(Gene Munson, personal cxaranunicatian, February 21, 1992). Pollen analysis of
this stratigraphic profile was undertaken in an attempt to identify changes in
vegetative or climatic conditions that may have influenced the occupation of the
area.

本次研究对24BH2521遗址一处土壤剖面的6件地层样品开展了孢粉分析。该土壤剖面包含两处居住遗存组分：上层为公元200年左右的贝桑特（Besant）定居遗存，下层为公元前900年左右的鲍尔斯-扬基（Powers-Ycnkee）定居遗存。蒙大拿州东南部的定居活动呈现出可预测的演化规律：公元100年以前，该区域定居活动较为稀少；公元100年至700年期间，定居活动频次逐步提升；公元750年至1100年期间，定居活动有所衰减，在中断约200年后才再度恢复（吉恩·芒森，私人通信，1992年2月21日）。本次地层剖面孢粉分析工作，旨在识别可能影响该区域人类定居活动的植被或气候条件变化。