Waldron shale
The Waldron shale is a fossiliferous rock formation in Indiana. It has fossils such as gastropods, trilobites and trace fossils. It dates back to the end of the Silurian, around 423 million years ago.
The Waldron shale is a fossiliferous rock formation in Indiana. It has fossils such as gastropods, trilobites and trace fossils. It dates back to the end of the Silurian, around 423 million years ago.