What is Waldron shale?
The '''Waldron [[shale]]''' is a fossiliferous [[rock formation]] in [[Indiana]]. It has fossils such as [[gastropods]], [[trilobite]]s and [[trace fossil]]s. It dates back to the end of the [[Silurian]], around 423 million years ago. {{biology-stub}} [[Category:Fossils]] [[Category:History of Indiana]] [[Category:Rock formations]]