OF THE UPPER MISSOURI. 81 
on sandstone, supposed to be trails of Planarian worms, are all the organic remains yet 
known from this locality. At Sage creek and on the Yellowstone, where the Cretaceous 
rocks are exposed, the fossils indicate a blending of Nos. 4 and 5. Wherever No. 5 is 
exposed in the vicinity of Tertiary beds the strata of both the White river and lignite 
basins repose directly upon it. It covers a large area around the Black hills, but its entire 
limits are not yet known. 
The following catalogue of Cretaceous fossils taken from a paper published by Mr. Meek 
and myself in the Proceed. Acad. Nat. Sci. Phila. Oct. 1860, is so arranged as to show the 
stratigraphical position as well as vertical range of each species, and the reader is referred 
to the vertical section of the Cretaceous rocks of the Northwest. 
“Of the 194 Cretaceous species and varieties enumerated in the following catalogue, seven 
are common to the Nebraska and New Jersey beds, viz.: Nautilus Dekayi, Ammonites 
placenta, A. complexus, A. lobatus, Scaphites Conradi, Baculites ovatus, and Gryphaa vesi- 
cularis?; and the following five species are probably common to Nebraska and foreign lo- 
calities, viz.: Nautilus Dekayi, Inoceramus problematicus, Gryphea vesicularis, Cucullea 
Jibrosa, and Microbacia coranula.”* 
Formations in ascending order. 
1 2 3 | 4 5 
CRETACEOUS SPECIES. 
ARTICULATA. 
ANNELIDA. 
TUBICOLA. : 
Serpula? tenuicarinata, M. & H. May 1857, Pr. Acad. Nat. Sci. Phil. 134, * 
MOLLUSCA. : 
CEPHALOPODA. 
TEUTHIDA. 
. . oe 
Phylloteuthis subovatus, M. & H. May 1860, Pr. Acad. Nat. Sci. Phil. 175, . 
BELEMNITIDA. : 
Belemnitella bulbos a, M. & H. March 1856, Pr. Acad. Nat. Sei. Phil. 70, 
NAUTILIDA. 
eee Dekayi, wae 1834, sae Or. Rem. oh i 8, = 4, and = 13, : : 
AMMONITID. 
Ammonites percarinatus, Hall & Meek, 1854, Mem, Am. Acad. Arts and Sci. he 
Boston, v. N. 8. pl. iv, fig. 2, . 
Ammonites y — M. x H. May 1860; “Be Ai Nat. Bei: Phil. 
* 
? . . 
Ammonites com plexus, Hall & Meck, 1854, pore hin Arts al Sci. Bos- is 
ton, " N. 8. 394, pl. iv, fig. 1 . ; 
pe coa ee gk 
* See remarks accompanying the paper from which this Catalogue is taken. 
VoL. x1r.—I11 
