original description
Kirkland, J. I. (1996). Paleontology of the Greenhorn cyclothem (Cretaceous: late Cenomanian to middle Turonian) at Black Mesa, northeastern Arizona. <em>New Mexico Museum of Natural History and Science.</em> Bulletin 9, 1-131, pls. 1-50. [details] Available for editors [request]
From editor or global species database