LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON
LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON
LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON
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description of species 133<br />
Maude Island (Queen Charlotte Islands), from beds that have been thought to<br />
belong in the Haida group, which apparently is much younger than those at Ono.<br />
Nerinea sp. undet.<br />
(PUL* 9, FI«UN» 3,1)<br />
Shell small, spire short, relatively thick, turreted as in the preceding species,<br />
although sloping more rapidly to tbe apex; basal part not known. This species<br />
occurs with the preceding at Locality 1353 (Calif. Acad. Sci.) in the Ono zone, near<br />
tho baae of the Horsetown group on the Cottonwood Creek, Shasta County. Because<br />
of the rarity of the genus in tbe Cretaceous of California, this form is here<br />
recorded with the preceding.<br />
"Nerinea" dispar Gabb<br />
jVerinfo dupar GABB, Paleont. Calif., vol. 1, 1864, p. 113, pi. 19, figs. 63, Gfla; North<br />
fork of Cottonwood Creek, Shasta County; vol. 2,1869, p. 231, "Shasta Group."<br />
Cottonwood Creek—STEWAM, Phila. Acad. Nat.ScL, Pr,, vol. 78,1926, p. 322,<br />
This species seems not to bave been recognized by later writers, and there is no<br />
record of its occurrence in the Shasta series other than that given by Gabb, The<br />
holotype is in the Museum of Paleontology, University of California. Stewart<br />
gives its dimensions as follows: length (incomplete), 55 mm.; width, 13.5 mm.<br />
According to Stewart (1926, p. 322) it is "related to 'Cltmtcala' dtmenlina<br />
(d'Orbigny) from the Cretaceous (Albian) of Europe."<br />
A similar form, although much smaller than Gabb's species, has been found in<br />
the lower Chico beds of Middle fork of Cottonwood Creek.<br />
CEIUTUIIDAE Menke<br />
CEN'FHTUM tlrigotum Stanton<br />
Ctrithium ttriaoaum STANTON, U. S, Geol. Surv., Bull. 133, 1895, p. 71, pi. 13, fig. 7;<br />
Shelton a ranch, 5 miles north of Paskenta, Tehama County.<br />
"Shell small, slender, consisting of nine or ten rounded whorls, surface ornamented<br />
by narrow, elevated, transverse eeatae and by revolving line*., There are<br />
eight coetae on each whorl, so arranged that they form continuous varices the full<br />
length of the shell. Pour of the revolving lines are visible on the spire.<br />
"Height, G mm.; greatest breadth, 2 mm."<br />
The list of species (Stanton, 1SG5, p. 18) containing this form contains also Apatite<br />
cratiicallis, "Olcotltphanua" mulabilis Stanton, "HoplUe*" angulatut, and other<br />
species characteristic of the Paskenta group.<br />
Potamide* diadema Gabb<br />
Potamuto diadema GABB, Paleont. Calif., vol. 1, 1864, p. 130, 227, pi. 20, fig. 85;<br />
North fork of Cottonwood Creek, Shasta County; vol. 2, 1869, p. 227; "Shasta<br />
Group," Cottonwood Creek—STANTON, U, S. Geol. Surv,, Bull. 133, 1895, p.<br />
13; lower Horsetown, North fork of Cottonwood Creek—STEWART, Phila.<br />
Acad. Nat. Sci., Pr., vol. 78,1926, p. 356; Locality and horizon as above.<br />
This specieB tB abundant in the lower beds of the Horsetown group of the Shasta<br />
series.<br />
It has been found abundantly in the beds exposed near tbe bridge at Ono (Locality<br />
1353, Calif. Acad. Sci.), where it ia associated with Neocrasprdilee aguila nov.,<br />
Acroleuikii kerrunsii nov., and Inaceramus colonicus nov.