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1884. ] Geology and Paleontology. 59 
flow which once covered the country as far as traversed by the 
railroad from Deming to Silver City. Its age I could not 
ascertain. 
A great display of the Loup Fork formation is seen in the 
drainage basins of the heads of the Gila river. In traveling west- 
ward from Silver City, its beds first appear in the valley of Man- 
gus creek, which enters the Gila from the east. Crossing the 
Gila, the mail route to the west passes through the valley of 
Duck creek, which flows eastwards into that river. Though 
bounded by eruptive hills and mountains, and their outflows, the 
valley was once filled with Loup Fork beds; which have been 
extensively eroded, the principal exposures being on the north 
side of the valley, forming the foothills of the Mogollon range. 
n the divide between the waters of the Gila and San Francisco 
rivers, the formation rises in bluffs of 300 feet elevation. 
descent into the valley of the San Francisco brings to light a still 
greater depth of this deposit. The valley, which extends from 
the cafion which encloses the river south from the mouth o ry 
creek, to the Tulerosa mountains on the north, and between the 
Mogollons on the east :and the San Francisco range on the west, 
was once filled with the deposit of a Loup Fork lake. This mass 
basaltic outflows or not. When so protected, the river flows 
hrough comparatively narrow cafions. Where the outflow is 
for the fortunate discovery, by Mr. Robert Seip, of the skull of a 
Species of rhinoceros of the typical Loup Fork genus Aphelops. 
It is apparently the A. fossiger Cope, a species abundant in the 
Loup Fork beds of Kansas and Nebraska. It was found near 
the mouth of Dry creek, in a conglomerate bed of the formation. 
In the valley of the San Francisco, the Loup Fork beds reach 
a thickness of 500 teet, and consist of sand, clayey sand, soft 
Sandstone and conglomerates of larger and smaller pebbles of 
eruptive material, having a near resemblance to those of the 
gion of Santa Fé —&. D. Cope. 
ON New LeMUROIDS FROM THE PUERCO FORMATION.—The ani- 
Px of the Eocene period, of the Adapidz, may belong to the 
puroidea, but the evidence which I have derived from the feet 
— €lycodus! has led me to refer them? to the insectivorous divi- 
on of the Bunotheria, to the neighborhood of the Tupæidæ and 
Wade. At the same time I retained provisionally the gen- 
= 
Sah “N.S. GG Survey W. of rooth mer., G. M. Wheeler, Iv, p. 140. 
; seedings Academy Nat. Sciences of Philada., 1883, pp- 78-80. 
