Terebratulide stratigrapihc ranges

Genus durations calculated from the observed first and last occurrence data from the revised brachiopod Treatise on Invertebrate Paleontology (Curry and Brunton 2007), with genera assumed to range from the base of the stage in which they first occurred to the top of the stage in which they last occurred. Ages of stage boundaries are from the revised Devonian timescale of Ogg et al. (2009)