上白塘遗址埋藏于浙江湖州安吉县西苕溪流域的红色黏土堆积中，于2019年调查时发现。2022年浙江省文物考古研究所联合安吉县博物馆对上白塘遗址进行了发掘，发掘面积1100 m²，采集和出土石制品共889件，遗物主要集中分布于第3层。石制品类型包括石核、石片、石器、断块和碎片。原料采自遗址附近的砾石，岩性以石英砂岩和硅质岩为主；石核剥片采用徒手锤击，多数缺乏预制程序，但存在少量盘状石核和似棱柱状石核；石片大多为中小型；石器类型较少，主要是刮削器，另有少量砍砸器、石球和石锤等；石器毛坯以石片为主，修理程度有限。初步光释光测年结果显示，第3层的年代为3.5万~8.8万年。上白塘遗址的发掘，为认识MIS 5阶段以来中国南方地区尤其是长江下游地区晚更新世早中期砾石工业石片化和小型化等问题提供了重要材料。

The Shangbaitang site is located in Anji County, Huzhou City, Zhejiang Province. The site is buried in red clay deposits within the Xitiaoxi River basin. In 2022, the Zhejiang Provincial Institute of Cultural Relics and Archaeology and the Anji County Museum carried out excavations at the Shangbaitang site, covering an area of 1100 m². Stone artifacts were unearthed in layer 3 and layer 4. Layer 3 is a homogeneous red soil layer, and stone products were mainly unearthed in this layer. Layer 4 is a reticulated red soil layer, and just unearthed a small amount of stone artifacts. According to the dating results, the age of layer 3 is 35~88 ka before present, and the age of layer 4 is more than 100 ka before present. A total of 889 stone artifacts were founded at this site, including 817 from Layer 3 and 47 from Layer 4, along with 25 collected from ground survey. The artifacts include stone cores, flakes, tools, broken blocks and fragments. Preliminary analysis indicates that the raw materials were mainly local gravels, primarily quartz sandstone and a high proportion of siliceous cobbles. Stone cores were percussed through freehand hammering without a prepared process, but the presence of discoidal and prismatic cores suggests some degree of organization in the reduction sequence, reflecting a progressive aspect of core-flake industry. Flakes were predominantly small. There is a low proportion of tools. Scraper was the dominant tool type, along with a small number of choppers, spheriods, and hammers. Tool blanks were mostly flakes with limited retouching, and finely retouched tools were almost absent. Additionally, 18 refitted groups of artifacts were identified, indicating minimal post-depositional disturbance. The early and middle Late Pleistocene was a crucial phase in human evolutionary history. During this period, the majority of sites in northern South China transformed into a lithic industry dominated by flake tools, but the cultural landscape of the lower Yangtze River region during this period remains unclear. Shangbaitang is a rare site that has undergone scientific excavation and dating, and has yielded a large number of stone artifacts. Compared to the Middle Pleistocene, the raw materials, sizes, and types of stone artifacts at this site have undergone significant changes. The proportion of small and medium-sized flake tools is significantly higher than that of large pebble tools, making it a typical representative site of the miniaturization and flaking of the pebble industry. In conclusion, the chronological data and lithic assemblages from the Shangbaitang site provide crucial materials for understanding the emergence and development of small flake tool industries in southern China.