found in ocean sediments
在海洋沉积物中发现
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The fossils were found in a seam of limestone that was 50 feet thick and was created when ocean sediments solidified millions of years ago.
化石是在50英尺深的石灰岩层里，它形成在大约百万年前由于海水泥沙沉淀物的堆积硬化。
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