The purpose of this thesis is to introduce excavation data from testing and minor excavation at Chuang-hou Ts’un of Shen-kang Hsiang and at Lung-ch-uan Ts’un and Shan-chiao of Lung-ching Hsiang in Taichung Hsien, west-central Taiwan, the Republic of China. I will consider certain hypotheses based upon that data concerning the prehistoric chronology and culture sequence of west-central Taiwan, the wider cultural contents of the Gray-black Impressed Ware Phase, and the correction of certain dates of sea level changes during Taiwan’s quaternary geohistory.