The positions of the brown pottery shards they found at Tayuan suggest that the Chienshan cultural stratum intersected the Yuanshan and Botanical Gardens cultural strata. At greater depth, the excavations have also revealed items of a different character thought to belong to a third cultural stratum. This third stratum is currently thought to be related to the Hsuntangpu, a mid- to late-Neolithic culture dating back some 4,000 years.
以年代定位法研判部分褐色陶片等遺物，尖山遺址文化層除了包含「圓山」和「植物園」兩個文化層外，在其下方，還出現了性質不同、考古學上所謂的「第三文化層」，目前判斷是介於新石器時代中期與晚期、距今約 4,000 年前的「訊塘埔文化」。