knowlton.i COALVILLE, UTAH, AND VICINITY. 7 
of Bitter Creek just east of the station. The first fossiliferous hori- 
zon in front of the station, clearly belonging to the Fox Hills, is about 
200 yards back from the edge of this bluff. The dip brings this horizon 
down to the level of the valley a little more than a mile from the station. 
Immediately overlying it is a brown ferruginous sandstone containing 
the following marine Cretaceous forms: 
Mactra alta M. & H. 
Mactra warrenana M. & H. 
Dental ium gracile H. & M. 
Ostrea glabra M. & H. 
Inoceramus cripsii var. barabini Mor- 
ton. 
Cardium speciosura M. & H. 
About 4 miles eastward a line of cliffs is reached. The exposures 
are somewhat obscured between the two places, but nearly 700 feet 
of strata are passed, and then the characteristic Fox Hills fauna is 
again found near the base of the cliffs, showing that the formation is 
still marine Cretaceous. In other words, it is shown that there are more 
than 700 feet of typically marine Cretaceous above the coal-bearing 
series in the Point of Rocks section. 
The Point of Rocks flora is the richest and most important thus far 
discovered n the Montana formation. It embraces no fewer than 
58 species belonging to 33 genera. The greater part of the plants 
were obtained in lenticular argillaceous masses in the upper portion of 
the massive sandstone, and a few have been found in the shales over 
the coal. Another locality which has afforded a number of species is 
southeast of the station, in strata apparently as low as in the locality 
ibove mentioned, and possibly even lower. 
The plant-bearing localities of Carbon, Rock Springs, Hams Fork, 
rod Evanston were also visited by us, and a brief account of them 
s given in the joint paper above referred to. 1 They are all regarded 
is being above the Montana. 
COAI/VIIiLE, UTAH, AND VICINITY. 
The geology in the vicinity of Coalville is somewhat complicated, 
tnd extensive differences of opinion have prevailed among geologists. 
Che following brief historical account is given by Mr. T. W. Stanton: 2 
The coal-bearing Cretaceous beds exposed at Coalville, Utah, and on Bear River, 
tear the mouth of Sulphur Creek, Wyoming, have been the subject of considerable 
liscussion, and various opinions concerning their precise age have been published 
>y the several geologists and paleontologists who have visited the localities or ex- 
,mined collections from them. They were referred to the Cretaceous by Messrs. 
leek and Engelmann 3 in 1860, and were compared with certain Cretaceous beds at 
he mouth of the Judith River, then regarded as belonging to No. 1 (Dakota), but 
afterwards proved to be of Fox Plills age. When Captain Simpson's report 4 was 
mblished in 1876, Mr. Engelmann again expressed the opinion that these beds are 
•robably "Lower Cretaceous" [Dakota]. 
i Bull. Geol. Soc. Am., Vol. VIII, pp. 148-150. 
2 The Colorado Formation : Bull. U. S. Geol. Survey No. 106, pp. 37, 38, 1893 (1894). 
3 Proc. Acad. Nat, Sci. Phila., Vol. XII. p. 130 (1860). 
1 Exploration across the Great Basin of Utah in 1859, p. 291(1876). 
