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1980年12月,上海博物馆考古组在松江县汤庙村遗址进行了一次小型发掘,清理了新石器时代墓葬四座,有随葬石器和陶器三十九件,其中在M_1脚下发现了一件三角形石器,引起了人们的注意。此器系板岩磨制,呈等腰三角形,两侧作双面刃,器身后端两角残缺,中穿一孔,由两面钻琢而成,底面靠后处有一阔舌形凹弧。器长13.9、残宽10.4、孔径3厘米,尖端夹角73°。形制与犂铧相
In December 1980, the Shanghai Museum Archeology Group conducted a small excavation in the site of Tangmiao Village, Songjiang County, clearing up four Neolithic tombs, with 39 burial stone and pottery, of which a triangular stone was found at the foot of M_1 , Has aroused people’s attention. This system is slate mill, was isosceles triangle, both sides for double-edged blade, incomplete rear end of the body, wearing a hole, both sides cut into a drill, the bottom of the back of a wide tongue-shaped concave arc. Length 13.9, residual width 10.4, aperture 3 cm, the tip angle of 73 °. Shape and plowshare phase