Brady, L.F., 1947, Invertebrate tracks from the Coconino sandstone of northern Arizona: Journal of Paleontology, v. 21, no. 5, p. 466-472.
Brady, L.F.
Journal of Paleontology, v. 21, no. 5, p. 466-472.
Invertebrate, Trace Fossil, Paleontology, Coconino Sandstone - Permian, (Aubrey Group),