Leiorhynchus rockymontanum

Leiorhynchus rockymontanum is a somewhat strange looking brachiopod. It takes the Rhyconellid body habits of a central sulcus to extreme limits. AS you can see from the pictures below the body does not have much actual depth to it, in fact it's somewhat flat. However, the shape of the central sulcus bends the body out of shape. This and the next specimen are both from the Finis Shale of Jacksboro, Texas and hail from the Carboniferous period (Pennsylvanain).







Specimen #2