前弧海盆に堆積した田辺層群の上部層が広大な波食棚に露出し志原の千畳敷として有名です。砂岩と泥岩の折り重なった砂岩泥岩互層が分布し海食崖・海食洞・波食棚などの海岸地形が発達します。地層には生痕化石が多く見られます。海岸南側の村島磯は田辺層群の下部層の傾斜した地層が観察できます。

Mudstone in the lower layer invades the upper layer of the Tanabe Group deposited in the forearc basin to form a mud diapir. The columnar intrusive rock that was once liquefied deep underground due to an earthquake and cut into the upper stratum is called mud diapir. When it erupts on the seabed or the surface of the earth, it becomes a mud volcano. This world's mud volcano is known for Kumano Nada (seabed) and Niikappu, Hokkaido (land).

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うえもり　う 2022/01/19(Wed) 20:55 No.100