636 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



CEPHALOPODA. 



Baculites asper Morton? 



Baculites asper Morton, 1834 : Synopsis Org. Eem. Cret. Gr., p. 43, PI. I, figs. 12 and 13; 

 PI. XIII, fig. 2. Stanton, 189-4: Bull. U. S. Geol. Surv. No. 106, p. 167, 

 PI. XXXVI, figs. 4 and 5. 



Occurs with Inoceramus acuteplicatus, etc., at the locality one-fourth 

 mile above the mouth of Sickle Creek, and is abundant associated with the 

 same fauna on the Missouri River below Fort Benton, in the upper part of 

 the Colorado formation. It is also found at Cinnabar Mountain. 



Scaphites ventricosus Meek and Hayden. 



Scaphites ventricosus Meek and Hayden, 1862: Proc. Acad. Nat. Sci. Pliila., p. 22. 

 Meek, 1876: U. S. Geol. Surv. Terr.. Yol. IX, p. 425, PI. VI, figs, la, b, and 8a, b. 

 Stanton, 1894: Bull. U. S. Geol. Surv. No. 106, p. 186, PI. XLIY, figs. 8-10; 

 PI. XLY, fig. 1. 



Several specimens from the localities above mentioned on Snake River, 

 and a fragment believed to belong to this species from the black shales of 

 Electric Peak. 



It occurs well preserved at Cinnabar Mountain just north of the Park, 

 and with the preceding species below Fort Benton. 



MONTANA FORMATION. 1 

 BRACHIOPODA. 



Lingula subspatulata Hall and Meek. 



Lingula subspatulata Hall and Meek, 1S54: Mem. Am. Acad. Arts and Sci., Yol. Y, 

 p. 380, PI. I, figs. 2«, b. White, 1876: U. S. Geog. and Geol. Surv. W. lOOtli 

 Meridian, Yol. IY, p. 169, PI. XY, fig. 4a. 



Two specimens from sandstone overlying bituminous shale on Rattle- 

 snake Creek, probably same horizon as the remainder of the species 

 mentioned below. 



1 See pp. 606-607 for remarks on the horizon of the following species. 



