The formation ranges in age from the Middle Eocene (Uintan), with the underlying lower member dated at 46.1 ± 0.1 Ma and the upper member of the Eocene section dated at 38.9 ± 0.3 Ma.[1]
A. C. Henrici and S. R. Haynes. 2006. Elkobatrachus brocki, a new pelobatid (Amphibia: Anura) from the Eocene Elko Formation of Nevada. Annals of Carnegie Museum 75(1):11-35
E. H. Taylor. 1941. A new anuran from the middle Miocene of Nevada. University of Kansas Science Bulletin 27(4):61-69
F. M. Carpenter. 1930. The Fossil Ants of North America. Bulletin of the Museum of Comparative Zoology, Harvard University 70:1-66