Geology and Natural History. 153 
It is believed that additional light has been thrown on the 
of the age of the Galisteo sandstone; and that its ‘ialconccll 
ogy has de cided a. that of the Sante Fé marls. The first 
fossils discovered in “Trias” of the Rocky Mountains, have 
enabled me to mee more definite conclusions as to its position 
in the scale of periods. The remains of vertebrata — — 
the latter formation are those of fishes and reptiles. The er 
are rhomboganoid scales of small species which are numerous in 
the coprolites of the reptiles; the latter represent the three orders 
of Crocodiles, Dinosauria, and apparently of Sauropterygia. 
The dinosaurian order is oa by a part of the crown of a 
a ten and names it potho mae CoCcinaru 
regularly fitted dermal bones distinguish this genus from Belodon. 
He remarks that the evidence from this species is favorable to the 
— of this horizon with that of the Trias, although it 
cannot urse be regarded as conclusive, until more perfect 
corms are obtained. 
The thickness of the Eocene of the region is estimated at 3,000 
feet, of the Cretaceous at about 5,000 feet, the Jurassic at 600 ‘feet 
and the Trias at 1 ,000 feet or more. 
2. Fossil Ungulates Jrom New Mexico. — Professor Core 
(Proc. Philad. Acad. Sci., 1875) has described a species of camel, 
about as large as the drom medary, from near Pojuaque, under the 
— Srna vuleanorum. The dental formula is, molars 
so the Hippotherium ealamarium Co ope, from near San 
Tdefoneo, nid Aphelops Jemezanus Cope, a rhinoceros, from near 
the town of Santa 
3. Coal _ in the Subcarboniferous wy. Pennsylvania. ookatter 
0. 2 
reser or White Catskill, Rogers’ Vespertine. are i 
by the tunnel of the East Broad Top Ra ilroad through Sideling 
structing a a of all the measures from the Trenton up to the 
Top, across the outcrops of the Clinton fossil ore- 
beds, the teem hematites of the Hamilton, and the ores of IX 
and XI, Catskill and Umbral (or Cuyahoga’ of Newberry), with 
