Guogang Shell Fossil Layer. The Guogang Shell Fossil Layer contains shell fossils formed approximately one to six million years ago. The rock strata feature bivalves, pteropods, gastropods, and. The Guogang Shell Fossil Layer contains shell fossils formed approximately one million to six million years ago. The rock strata feature fossils of bivalves, pteropods, gastropods, and corals. During the Japanese colonial era, in the 5th year of the Showa period (1930), the Governor-General of Taiwan designated it for preservation. In the 44th year of the Republic of China (1955), the Miaoli County Historical Records Committee erected a stone monument for the Guogang Shell Fossil Layer, declaring the area for academic research only and prohibiting indiscriminate reclamation to preserve the ancient shell fossil layer.
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Miaoli