2pc Paleozoic Carboniferous invertebrate brachiopods Bow spirifer fossil

Description

Famous Fossil-
stone swallow In the Carboniferous period 330 million years ago, there lived a kind of ancient invertebrates. It is a crustacean, a genus of Brachiopod. The outer shell is horizontal and square, and when it extends to the left and right, it gradually shrinks and opens up. The shell has thick radial folds like swallow wings, so the ancients called it a "stone swallow".
stone swallow was originally a marine animal, but due to geological changes, it can now be found more than rocks.
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