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The Boso Peninsula in Chiba Prefecture is a hilly region formed by the uplift of sedimentary rocks due to crustal movement. Traces of a reversal of the Earth's magnetic field can be seen in the outcrops of these sedimentary rocks. The geological period known as the "Chibanian" was named around the time when this magnetic field was reversed, but what kind of place was it exactly? We will also take a detour to the Shonan coast of Kanagawa Prefecture as we explore the terrain by motorcycle. ★Website "Listen to the voice of the contour lines!" http://chiririder.com/ ★Geographic Rider's Twitter (Follow now) / chiri_rider ★Question box (For questions and requests not directly related to the video, please go here) https://peing.net/ja/chiri_rider Source of geological map: AIST Geological Survey of Japan "1:200,000 Seamless Geological Map of Japan v2" https://gbank.gsj.jp/seamless/v2.html