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

User AllieCat
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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.
User Neil Twist
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