Gazin, C. L.
1941. The mammalian faunas of the Paleocene of central Utah, with notes on the geology. Proc. U. S. Nat. Mus., 91, no. 3121: 1-53, 3 pls., 29 figs. in text.
Granger, Walter.
1917. Notes on Paleocene and lower Eocene mammal horizons of northern New Mexico and southern Colorado. Bull. Amer. Mus. Nat. Hist., art. 32: 821-830, 2 pls., 1 fig.
Matthew, W. D.
1937. Paleocene faunas of the San Juan Basin, New Mexico. Trans. Amer. Philos. Soc., n. s., 30: i-viii, 1-510, 65 pls., 85 figs. in text.
Osborn, H. F.
1929. The titanotheres of ancient Wyoming, Dakota, and Nebraska. U. S. Geol. Surv., Monog. 55 (2 vols.): i-xxiv, i-xi, 1-953, 236 pls., 797 figs. in text.
Simpson, G. G.
1937. The Fort Union of the Crazy Mountain Field, Montana, and its mammalian faunas. U. S. Nat. Mus., Bull. 169: i-x, 1-287, 10 pls., 80 figs. in text, 62 tbls.
1948. The Eocene of the San Juan Basin, New Mexico. Amer. Jour. Sci., 246: 257-282, 363-385, 5 figs. in text.

University of Kansas, Museum of Natural History, Lawrence, Kansas. Transmitted July 1, 1950.

Transcriber's Notes

Page 4: Changed preceeding to preceding
(field work in the preceding summer).