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In: Clams, Collection Pieces, Limestone

The Carboniferous clam species, Astartella concentrica Conrad 1842, has been found in rocks dated from 318.1 million to 298.9 million years ago [1]. This is a range of 20 million years. The genus, Astarella, is found in a much more extensive range, 326.4 to 247.2, or 79.2 million years. TwoRead More →