42 
LARAMIE BASIN, WYOMING. 
bambini, I. sagensis, Avicula linguiformis, A. nebrascana, and Bacu- 
lites compressus. The first and last of these forms also occur in the 
sandy beds which intervene between the massive sandstone and the 
top. of the thick mass of shales of the lower part of the Montana. 
These sandy beds yielded Nucula planimarginata, Lucina, and 
Cinulia on the south shore of James Lake. In the north bank of 
Little Laramie River, at a point 2 J miles north of Carroll Lake, the 
shale member yielded Mactra gracilis, Baculites ovatus, and B. 
anceps var. obtusus, forms which are believed to represent a high 
Pierre horizon. In upper beds of the shale member a mile south- 
east of James Lake, in the SW. \ NW. \ sec. 7, T. 17 N., K. 75 W., was 
found a nearly complete skeleton of a large saurian which has not 
yet been classified. In upper beds of the Montana at Bengaugh's 
ranch on Cooper Creek, in the SE 
following were found: 
Inoceramus cripsii var. barabini Morton. 
Inoceramus sagensis Owen. 
Ostrea pellucicla M. and H. 
Avicula linguiformis E. and S. 
Avicula nebrascana E. and S. 
Pectunculus wyomingensis (Meek). 
Modiola galpiniana (E. and S.). 
Tancredia americana M. and H. 
sec. 21, T. 18 N., R. 77 W., the 
Callista (Dosiniopsis) nebrascensis M. 
and H. 
Baculites ovatus Say. 
Micrabacia americana M. and H. 
Capulus. 
Anomia. 
Pentacrinus. 
Serpula. 
The following were collected from the upper portion of the lower 
part of the Montana, as shown in the section on page 37, in the 
SE. J sec. 8, T. 20 N., R. 76 W., a short distance from the base of Pine 
Ridge, 2 miles southeast of Rock River station: 
Ostrea pellucida M. and H. 
Syncyclonema rigida H. and M. 
Avicula nebrascana E. and S. 
Avicula linguiformis E. and S. 
Inoceramus sagensis Owen. 
Pinna lakesi White. 
Yoldia evansi M. and H. 
Cardium speciosum M. and H. 
Legumen planulatum Conrad. 
Tellina scitula. 
Liopistha (Cymelia) undata M. and H. 
Corbulamella gregaria M. and H. 
From beds slightly higher were 
barabini and /. vanuxemi. 
From beds 1,100 feet above the 
feet below the top of Lookout Flat, 
the following were obtained : 
Avicula linguiformis E. and S. 
Inoceramus cripsii var. barabini Morton. 
Protocardia subquadrata E. and S. 
Baculites ovatus Say. 
Anchura rostrata Gabb. 
Anchura americana E. and S. 
Fasciolaria (Piestocheilus) alleni White. 
Fusus (Serrifusus) dakotensis M. and EL 
Baculites ovatus Say. 
Helicoceras mortoni var. tenuicostatum 
M. and H. 
Placenticeras intercalare M. and H. 
Leptosolen. 
Volutomorpha (?). 
Actseon. 
Heteroceras. 
obtained Inoceramus cripsii var. 
sandstone in Pine Ridge and 150 
as shown in the section on page 37, 
Baculites compressus Say. 
Ostrea. 
Lucina. 
