pecimens of one
species seem to be indistinguishable; the specimens of another Angels
Peak member are perhaps slightly more advanced; and seven include
specimens, distinguishable in greater or lesser degree, which suggest,
principally in smaller size, a less advanced stage for the Angels Peak
faunule.

In general, the non-ferungulate part of the Angels Peak faunule seems
to depart more widely from what is typical of the "Torrejon" fauna than
do the Carnivora and Condylarthra. Because the former is very poorly
represented in the faunule, and not too well known elsewhere in the San
Juan Basin, it may be argued that the apparent differences would
disappear with the acquisition of more material. This may be so, but at
present the point can not be demonstrated.

It is not justified at present to maintain that the Angels Peak species
occupy an earlier position in the Torrejonian than do those obtained
from outcrops between Kimbetoh and the heads of the two forks of Arroyo
Torrejon. Indeed, the stratigraphic position of the Angels Peak pocket
with a considerable thickness of Torrejonian strata beneath it, tends
to argue against such a view. Nevertheless, it is possible, if not
probable, that such is the case, or at least that detailed work would
reveal a series of faunules of slightly different ages in the
Torrejonian stage of the Nacimiento formation. Of course, chance in
collecting, as well as geographic and ecologic differences, play their
part in giving such a local faunule as that at Angels Peak its somewhat
different aspect, but these factors may not account altogether for the
observed differences.

LITERATURE CITED

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