Last Updated:2025/11/23

The geologist carefully measured the sole mark left by the burrowing organism on the sandstone bed.

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The geologist carefully measured the sole mark left by the burrowing organism on the sandstone bed.

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地質学者は、砂岩層の底面に残された、下位層の上面の形が写った痕跡(底面痕)を注意深く測定した。

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