11i< iyi<i>>, D'His dm/ ■liifii tn It'.nis.. — ]\f<(r<'oit. oil 
shows Mes(jzoic Cephalopoda such as: Midillicotid mul Potmm,- 
r(;n(s, mixed with Dyassic forms such as: An'cnlopicten. Gcrrllla. 
Clydophoriis. etc. It is a fauna related with the Russian fauna 
of the Artinsk beds, and may l)e considered as the American rep- 
resentative of a part of tlie Russian Dyas (Permian). 
Some of the vertebrates determined ])y professor Cope liave 
been found, according to Mr. Cummins, in the strata of tlie lower 
part of the Clear Fork division, about a little above the horizon 
■of the fossiliferous limestone, with Malli^-offid of the Military 
•crossing (Baylor county). So it will be best and more logical to 
separate from the Clear Fork division, about ;>()(> feet of its 
lowest strata, which will reduce its whole thickness of 1,1)75 feet, 
as given by Mr. Cummins, to about 1,(5(10 feet. Then the Clear 
Fork tlivision. so reduced, is a formation above the ])yas, and 
represents the Lower Trias or Hunter sandstone of Europe. Where 
I saw it, just north of tlu' Wichita mountains, all along our road, 
hy the o5th parallel, after passing the Cross Timbers to Rock 
Mary and the natural mounds, 1 did not find fossils; but on lith- 
■ological and stratigraphic ground. 1 have no doubt that all the 
strata there are Lower Trias. In my reconnaissance of 18oH, it 
was impossiltle to do more than to follow the road, with a few 
ycig-zags, right and left, because it was a heavy marching with a 
military escort, with strict ordt'i's not to go outside and never to 
lose view of the main column. 
The Double Mountain division is remarkable on account of its 
heavy and important dolomitic limestone, its very thick beds or 
lenticular masses of white gypsum and its salty clays and shales. 
3Ir. Cummins says that he saw among the dolomites many casts 
of fossils, but he does not give a single determination even of 
family, genus or species, so we are entirel}' ignorant of their na- 
ture. 1 did not find any trace of fossils, when T crossed that for- 
mation, except near Ki)soni spi'ing, before reaching Antelope 
hills. wlier«' I found a large fossil tree, beautifully silicified and 
traiisfoi'ined in jas[)er. which when polished I'esemliles somewiiat 
the Piiniltrs jlciroti! of the Trias of the ^'al d'Ajol in the A'osges. 
I have considered that gypsum group as n'presenting the ^Middle 
Trias or Musclielkalk of (Jermany: and 1 continue to do so. for 
nothing in it recalls in any way the Dyas of Knghmd. l-'rance ami 
Saxony: it is a younger formation. 
The Dockum beds or division of .Mi-. Cnmmins. was deseril>e(l 
