关键词: 三峡地区;新石器时代晚期;洋安渡;零台面石片;打制石器;磨制石器

Abstract: The Yang2an2du site (31°01′43″N, 109°30′24″E) is situated in Fengjie County, Three Gorges Region, and was discovered in 1994 and excavated in 2000. The site was buried in the second terrace of the Yangtze River. According to pottery stylistic [ do you want to use this word ?] research, this site belongs to the Daxi Neolithic Culture, with an absolute date of 5 ka BP.
A total of 616 stone artifacts were unearthed from this site, including hammerstones (6), cores(13), flakes (335), chunks (59), fragments (132), choppers (9), scrapers (32), chipped axes (17), polished axes (3), millstones (5), and polished pebbles (5). Raw materials exploited at this site were pebbles selected from riverbeds, of which more than 80 percent were silicarenite. [ check spelling].
The main flaking technique used at the site was a particular“throwing against anvil”approach, which can produce abundant null-platform flakes easily. Null-platform flakes are the most important kinds of whole flakes. [ I do not quite understand this last sentence ].
There are two kinds of stone tools that coexisted at the site: chipped stone tools and polished stone tools, with the number of chipped stone tools being greater than polished stone tools. In fact, polished stone tools only include three polished axes and five millstones , which were all broken. Choppers and scrapers are smiliar to types in Paleolithic sites, but the chipped axe is a particular kind of chipped stone tool, which is direct ;y associated with the production of polished axes. Although the site is dated to the late Neolithic, the chipped stone tools were still imported.

Key words: Three Gorges region; Late Neolithic; Yang-an-du; Null-platform flakes; Chipped stone tools; Polished stone tools