POLLEN ANALYSIS OF SAMPLES FROM THE DEPRESSION SITE (48SW13490), BLACK BUTTES PROJECT, SOUTHWESTERN WYOMING

The Depression Site (48SW13490) is located southeast of Point of Rocks at the eastern
edge of the Rock Springs Uplift in Sweetwater County, southwestern Wyoming. Rose Springs
points recovered from the Trench 7 block indicate a Late Prehistoric occupation. The Trench 8
block yielded evidence of two occupations, an Upper component, which is attributed to Rose
Springs people of the Late Prehistoric, and a Lower component that appears to represent an
Archaic occupation. Calibrated radiocarbon ages for the Late Prehistoric occupation are 1260-
960 BP and 970-750 BP for Features 14 and 6, respectively. The Archaic occupation is
anchored by a calibrated radiocarbon age of 5660-5470 BP (Feature 15) (Darlington, personal
communication, January 3, 2003). Pollen analysis was conducted on samples from seven
features to examine evidence of vegetation and possibly human activity during both the Archaic
and Rose Springs occupations at this site. In addition, four samples were examined from
possible occupation surfaces around Feature 16.

洼地遗址（48SW13490）坐落于怀俄明州西南部斯威特沃特县的罗克斯普林斯隆起东缘，岩石角东南侧。从7号探方区块出土的玫瑰泉尖状器（Rose Springs points）表明此处存在史前晚期人类活动遗存。8号探方区块则出土了两处人类活动遗存的证据：上层遗存被归为史前晚期的罗斯普林斯先民遗存，下层遗存则大概率属于古风时期（Archaic）人类活动遗存。14号与6号遗迹的史前晚期遗存校准放射性碳测年结果分别为距今1260-960年与970-750年。古风时期遗存的年代锚点为15号遗迹的校准放射性碳测年数据：距今5660-5470年（达林顿，私人通信，2003年1月3日）。研究人员对7处遗迹的样品开展了花粉分析，以探究该遗址古风时期与罗斯普林斯先民时期的植被状况及可能的人类活动痕迹。此外，还对16号遗迹周边疑似活动面的4份样品进行了检测分析。