約850 mにわたり、幅約15mの橋脚のような岩塔（橋杭）が直線状に並びます。約1400万年前に地下から上昇したマグマが熊野層群に貫入した流紋岩（石英斑岩）の岩脈です。岩脈が崩壊して波食棚に散在する漂礫は、巨大地震による津波で運ばれたとされます。（注：橋杭岩も、日本の地質百選『古座川弧状岩脈』に含まれます）弘法大師と天の邪鬼の民話や正直者と海坊主の民話が残されています。国際的に希少な鳥類であるウチヤマセンニュウの繁殖地でもあります。
Over about 850 m, rock towers (bridge piles) like piers with a width of about 15 m are lined up in a straight line. It is a rhyolite (quartz porphyry) dike in which magma that rose from underground about 14 million years ago invaded the Kumano Group. The gravel scattered on the wave-cut platform after the dike collapsed is said to have been carried by the tsunami caused by the great earthquake. (Note: Hashiguiiwa is also included in the 100 Geological Sites of Japan, "Koza River Arc-shaped Rocks".) The folk tales of Kobo Daishi and the evil spirits of the heavens, and the folk tales of honest people and Umibozu are left. It is also a breeding ground for Styan's Grasshopper Warbler(Locustella pleskei), an internationally rare bird.
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2022/01/20(Thu) 17:42 No.151
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