462 N. H. DARTON PALEOZOIC AND MESOZOIC OF ^YYOMING 



near Eock Eiver station. Three miles southwest, near the old stage road 

 crossing of Cooper creek, they found in higher beds 25 species of a char- 

 acteristic Fox Hills fauna. Plants were collected also at the "Button 

 Creek" coal mine, 6 or 7 miles northwest of the coal mine above referred 

 to. Owing to the limited exposures, the stratigraphic relation of the beds 

 was not clear, but they appeared to be at a higher horizon than the older 

 localities. Stanton and Knowlton concluded as follows : 



It is evident from the preceding tliat the coal-bearing series of the Laramie 

 plains is in large part, if not wholly, older than the true Laramie, as that 

 formation is usually defined, although it yields what has been supposed to be 

 a Laramie flora ; that is, instead of conformably overlying the Fox Hills beds, 

 it is overlain by them or included within them." 



. Marine fossils were collected from the Montana beds at two localities 

 by Mr Siebenthal and determined by Mr Stanton- The species from 

 Bengaugh's ranch, on Cooper creek near the Albany-Carbon county line, 

 are: Inoceramus cripsi var. harabini Morton, I. sagensis Owen, Ostrea 

 pellucida M. & H., Avicula linguiformis E. & S., A. nebrascana E. & S., 

 Pectunculus Wyoming ensis (Meek), Modiola galpiniana (E. & S.), Tan- 

 creclia americana M. & H., CalKsta (Dosiniopsis) nebrascensis M. & H., 

 Baculites ovatus Say, Helicoceras mortoni var. tenuicostatum M. & H., 

 Placenticeras intercalara M. & H., and Leptosolen volutomorpha, ( ?) 

 Actceon, and Heteroceras. From beds slightly higher were obtained Ino- 

 ceramus cripsi var. harabini and I. vanuxemi. From beds above the 

 sandstone in "Pine Eidge," 2 miles south of Eock Eiver station, Wyoming, 

 were obtained Avicula linguiformis E. & S., Inoceramus cripsi var. hara- 

 bini Morton, Protocardia subquadrata E. & S., Baculites ovatus Say, B. 

 compressiis Say, Micrabacia americana M. & H., Ostrea, Lucina, Gapulus. 

 Anemia, Pentacrinus, and Serpula. Fossils collected by me at various 

 localities west of Laramie were determined by Mr Stanton. The upper 

 beds of the lower division yielded Inoceramus harabini, Mactra gracilis, 

 Cardium speciosum, and the latter also occurs abundantly in higher beds 

 near Sheep mountain. The massive sandstone at the base of the upper 

 division is highly fossiliferous on the bank of the Little Laramie river at 

 J. Ernest's ranch, 17 miles west of Laramie. It yielded Inoceramus hara- 

 bini, I. sagensis, Avicula linguiformis, A. nebrascana, and Baculites com- 

 pressus. In a slightly higher sandstone east of Sheep mountain I found 

 a cast of an egg case of a fish classed by Dr Gill in the Harriotta.^'^ 



In the upper beds of the loAver division (Pierre), 14 miles north- 

 west of Howell, I discovered a skeleton of a saurian which Mr W. H. 

 Eeed, of Laramie, lias identified as Cleosaurus. A collection of fossils 



=" Science, vol. 22, 190.5, pp. 601-602. 



