Lingula from Pennsylvanian rocks of the Eastern Kentucky Coal Field.
The modern Lingula brachiopod looks just like the Lingula fossils found in Kentucky. This is why Lingula is known as a living fossil. Brachiopods are divided into two main groups, the Articulate and the Inarticulate. The two shells of inarticulate brachiopods are not hinged together and there are no hinge teeth to align the shells. Lingula is an inarticulate brachiopod. Fossil inarticulate brachiopods are not common in Kentucky.
Most brachiopod fossils in Kentucky are articulate, that is, they are hinged and may have hinge teeth to align the two shell. All of the following brachiopods are articulate.
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