IDENTIFICATION OF CHARCOAL FROM SAFCA SITES CA-SAC-15, CA-SAC-485, CA-SAC-1112, AND CA-SAC-1142, SACRAMENTO COUNTY, CALIFORNIA

Eighteen charcoal samples from sites CA-SAC-15, CA-SAC-485, CA-SAC-1112, and CA-SAC-1142 were submitted for identification. These sites are located on natural levees of the Sacramento River near Natomas in northeastern Sacramento County, California. Radiocarbon dates reflect multiple occupations of the area. The earliest dates of 7470 and 3700 cal BP are from site CA-SAC-1142, while the most recent dates from site CA-SAC-15 reflect occupation of the area just prior to, during, and after the Medieval Climatic Anomaly (Medieval Warm Period).

本次共送检了采自CA-SAC-15、CA-SAC-485、CA-SAC-1112与CA-SAC-1142四个遗址的18份炭质样品，用于种属鉴定。上述遗址均坐落于美国加利福尼亚州萨克拉门托县东北部纳托马斯附近的萨克拉门托河天然堤地带。本次获取的碳十四测年数据表明，该区域曾存在多期人居活动。其中，CA-SAC-1142遗址的测年结果最早，分别为7470 cal BP与3700 cal BP；而CA-SAC-15遗址的最新测年数据则显示，该区域曾在中世纪气候异常期（Medieval Climatic Anomaly，即中世纪暖期Medieval Warm Period）之前、期间及之后均有人类活动遗存。