What are cavities left in rocks when a shell or bone dissolves called

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asked Oct 22, 2016 180k views

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Neil Twist · Answer 1 · 2016-10-28T20:48:07+0000

It's a fossil form formed by either a mold or a cast. If an organism completely dissolves in the rock, it can leave an impression in the rock, called an external mold. If that mold gets filled with minerals, it becomes a cast.

What are cavities left in rocks when a shell or bone dissolves called

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