TO YELLOWSTONE: NATIONAL PARK. 121 
The following is a list of the fossils obtained during our examination of these mountains, as 
identified by Mr. Whitfield : 
Cretaceous, September 4 and 5. 
Ostrea congesta, Con., associated with fragments of carbonized wood. 
Jurassic, September 4 and 5. 
. Camptonectes eatenuatus, Meek. 
. Camptonectes bellistriata, Meck. 
. AMyacites (Pleuromya) subcompressa, Meck. 
. Myalina (Gervillia) perplana, Whitf. (n. sp.). 
. Gervillia erecta, M. & H. 
. Gervillia sparsaradiata, Whitf. (n. sp.). 
. Gryphwa planoconvera, Whitf. (n. sp.). 
a 
~ 
m Co Le 
src St 
Carboniferous, September 4. 
Summit. 
. Cyathopylloid coral. 
. Crinoidal plates. 
. Platycrinus, sp. ?. 
. Spirifera centronata, Winch. 
Limestone interstratificd with the red bands. 
. Productus nebrascensis, Meek. 
. Chonetes mesoloba, Norwood & Pratten. 
. Athyris, sp.?. 
we Os bo 
Nao 
Carboniferous, September 5. 
Summit. 
. Oystiphyllum, sp.?. 
. Campophyllum, sp.?. 
. Campophyllum torquium, Owen. 
. Chetetes, sp.?. 
. Zaphrentis centralis, Ev. & Shum. 2. 
. Syringopora mult-attenuata, McChes. 
. Spirifera centronata, Wiuch. 
Limestone interstratified with the red bands. 
8. Spiriferina Kentuckensis, Shum. 
9. Athyris planosuleata, Phil.?. 
10. Athyris subtilita, (H.) Meek. 
11. Rhynchonella Osagensis, Swall.?. 
12. Streptorhynchus crassus, M. & W. 
13. Productus punctatus, Mart. 
14. Productus costatus, Sow. 
15. Productus Prattenanus, Norwood. 
16. Productus cora?, or perhaps P. Prattenanus, Norwood. 
17. Productus, sp.; may be P. nebrascensis, Meek. 
18. Chonetes mesoloba, N. & P. 
19. Chonetes granulifera, Owen. 
20. Euomphalus, sp. 
AS oR be 
FROM THE BRIDGER MOUNTAINS TO THE FORKS OF THE MUSSELSHELL. 
We camped September 5 on Cottonwood Creek, and made from here a short excursion to the 
west of the road. The main valley of Shields River is a synclival, lying between the Bridger 
Mountains and the Crazy Woman’s Mountains, with an axis pointing in a direction about north 
20° west. In the valley, the rocks are rarely exposed; but riding up tbe creek, two or three miles 
from the road-crossing, we find the rocks dipping 30° east, with the strike north 30° west. The 
exposures here show a friable sandstone, disintegrating readily. The rock has a dark, somber 
appearance, and is made up of a greenish or brownish base, with small grains of quartz and a little 
16 Ww 
