Mikasa_Gensekiyama

三笠市の原石山は、新桂沢ダム堤体の材料を採取するために掘削された採石場跡で、約1億年前に海の底で堆積した地層「三笠層」を大規模に観察できる場所です。 原石山では、ダム建設によって露出した巨大な地層から、太古の海で形成された地質の様子を間近に見ることができます。 現在、原石山は三笠市主催のジオツアーなどに申し込みした方限定で見学できる特別なジオサイトとなっています。 The Genseki-yama Quarry Site in Mikasa City is a former quarry excavated to obtain materials for the construction of the Shin-Katsurazawa Dam embankment, and is a place where visitors can observe the “Mikasa Formation,” geological layers deposited on the seafloor approximately 100 million years ago. At Genseki-yama, massive exposed rock layers created during dam construction allow visitors to closely observe geological formations that originated in an ancient sea. Today, Genseki-yama is a special geosite that can only be visited by participants who apply for guided geopark tours organized by Mikasa City.