Sea kettle - Kaifu

Japanese: 海釜 - かいふ

A small depression in the seabed that is circular, elliptical, or crescent-shaped. They are often found near straits with strong tidal currents, and are formed when the tidal currents erode the seabed or prevent the deposition of sand and mud. They may be on either side of the narrowest part of a strait, be elongated along the strait, or be crescent-shaped at the tip of an island. There are many sea cauldrons in the straits and straits of the Seto Inland Sea, and the reason why elephant fossils are found here in large numbers is because the tidal currents erode the fossil layer and the accumulation of gravel.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

円形・楕円形または三日月形の海底の小凹地。潮流の激しい海峡付近に多く，潮流により海底が浸食されたり砂泥の堆積が妨げられて形成。海峡の最狭部の両側にある場合，海峡に沿って細長い場合，島の先端に三日月形になる場合がある。瀬戸内海の海峡・瀬戸には海釜が多く，ここからゾウ化石が多産するのは潮流による化石層の浸食と礫(れき)の集積の結果である。

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