226 R. T. Hill—Outlying Areas of the Comanche 
Prof. Marcou insisted that the beds from which this species 
came were of Jurassic age, and upon its occurrence he main- 
tained the existence of the Jurassic system in this region. It 
occurs at Belvidere, as on the original plains of the Kiamitia 
near Goodland, in Indian Territory, where it was last year col- 
lected by Mr. T. Wayland Vaughan of my division, and at 
Kent* in Trans Pecos, Texas, stratigraphically above and inti- 
mately associated with the species which he called Gryphea 
itchert. Thus we have in Kansas and Indian Territory Prof. 
ee alleged Jurassic species occurring stratigraphically 
above species he called Cretaceous, which facts forever remove 
any previous doubt, if any existed, in favor of his theory of 
the existence of the Jurassic formation in Texas, Indian Terri- 
tory, New Mexican region. 
A lithologic comparison of the Belvidere shales and those 
of the Washita division, North Texas section, is also of 
interest. While differing in detail, there is one broad generic 
resemblance. They are both in general shallower water deposits 
than the beds of the Fredericksburg division, the shales being 
blacker and containing beds of littoral sand. ’ 
Owing to the underlying Dakota flora of the Cheyenne 
sandstone there may be doubt in the minds of some whether 
to assign the Belvidere shale to the Dakota or to the Washita 
division, but it is difficult in view of the facts presented to see 
upon what possible ground they could have been referred to 
the Trinity division. ; 
Prot. Knowlton’s determination of the dicotyledonous Dakota 
flora in the top of the Cheyenne sandstone shows that from 
a paleontologic standpoint these sandstones have no resem- 
blance to the flora of the Trinity division at Glen Rose, 
Texas, beds which contains a flora of typical Potomac non- 
dicotyledonous species.t| The Cheyenne sandstones are of 
far later age than the Trinity, and occupy a stratigraphic 
position at the base of the Washita midway between the 
Trinity and the Dakota. 
These facts being true, Prof. Cragin’s assertion that the 
Dakota sandstone (No. IV of the general section) in Kansas 
rests directly on the Fredericksburg division without the inter- 
vention of the Washita division is also disproved. 
Concerning the correlation of the Belvidere beds with the 
Neocomian, as done by Prof. Cragin, we can only repeat our 
opinion, founded upon facts previously given, that the Washita 
division is homotaxially nearer the equivalent of the Gault, 
and that the lower lying beds of the Trinity division are 
ase seconde to Mr. E. T. Dumble, American Geologist, November, 1893, pp. 
+ See Proceedings U. S. National Museum, vol. xvi, pp. 261-282. 
