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 189<br />
et«r» 30 mm.; width of umbilicus, 8 mm,; height of whorl, 12 mm.; thickness of whorl,<br />
10 mm.; umbilical rate, 0.267:1. The paratypa (Calif. Aead. Sci. type Coll.) measures<br />
: diameter, 15 mm.; thickness of whorl, 4 mm. Both of these examples were<br />
found in 189B at Jackass Flat, a mile east of Horsetown, Shasta County, and were<br />
among those recovered from tbe San Francisco fire cf 1W0, This species resembles<br />
Puzosia diadenut, from the Buenaventura zone, and it may be regarded as a lineal<br />
successor from it.<br />
Puzomo wtaveri Anderson, n. sp.<br />
HPiste 41, tout<br />
Shell small, discoidol, compressed, and numerously costate ; umbilicus relatively<br />
broad, walls not abrupt, but rounded on the border, curving to the convex sides;<br />
sides marked by about five transverse, shallow goovea, inclining forward and crossing<br />
the ventral area with a forward sinus; interspaces between grooves occupied by<br />
eight to ten rounded coatae, separated by equally broad rounded hollows; section of<br />
whorl narrowly elliptical; suture line deamoceratid, although not completely exposed.<br />
The holotype of the species is in the Museum of Paleontology, University of<br />
California, and was loaned for fltudy and description through the courtesy of Dr.<br />
B. L. Clark, to whom the author is indebted for information as to its occurrence.<br />
It is well preserved in part, and has the following dimensions: greatest diameter,<br />
nmii ; width of umbilicus, 19 mm,; height of whorl, 30 mm-; thickness of whorl, 20<br />
mm.; umbilical ratio, 0.345:1. This example was found at the Fernandez tunnel<br />
on the Santa Fe Railroad, about 3 miles east of Rodeo, Centra Costa County. Its<br />
horizon is not yet definitely known, but it is presumably from beds of upper Horsetown<br />
age, although they may be younger. Tho beds appear to be nearly equivalent<br />
to those southeast of Crocket, from which a large fragment of Acanthoplitet has been<br />
obtained. The species is named for Dr. C. E. Weaver, in recognition of valuable<br />
contributioni) made to the geological and paleontologies! literature of California and<br />
of ether western States. One or two additional ammonoid species of upper Morsetown<br />
age have been reported from tbe neighborhood of this tunnel.<br />
Beudaniictrat Hitzel<br />
Beudanticera* breweri (Gabb)<br />
{PI«I» 43, ficura 1; pl&t* Spira 1,3)<br />
Ammanilex BrvWti GAUD, Paleont. Calif., vol. 2, 1609, p. 130, pi. 30, fig. S; pi. 19,<br />
fig. fib, only, (not figs, 6,6a); Cottonwood Creek, Shasta County.<br />
Demweeras oremen" STANTON, Geol. Sec. Am., Bull., vol. 5, 1894, p. 446; Horsetown<br />
BEDS—(7) WIIXTEAVXS, Geol. Surv, Canada, Mes. FOBS,, vol. 1, pt. 4, 1900, p.<br />
2&4|Maude Island—AjrpBBaos, Calif. Acad. Sci,, Pr., 3deer„ vol. 2, 1902, p.<br />
62; Horsetown Beds, Shasta County.<br />
Gabb's (1894, pi. 10) original figure and description of this species were quite defective,<br />
and he apparently abandoned them. In the second volume of his work (Gabb,<br />
ISdQa), he gave a new figure and an emended description which better represents the<br />
species. The holotype ia in the collections of the Academy of Natural Soiencea of<br />
Philadelphia and was l oaned for re-figuring and description, through the courtesy of<br />
Dr. H. A. Pilsbry. The species is abundant in the upper part of the Horsetown group<br />
ou Hulen Creek and on the Xorth fork of Cottonwood Creek. Many examples of all<br />
sizes belonging to this species were collected at Locality 1650 (Calif. Acad. Sei.) in the<br />
Neptune zone on Hulen C reek and also at the old mining camp at Horsetown, on Clear<br />
Creek, Many examples of the species are in the Museum of Paleontology, University<br />
of California, and others are in the collections of Stanford University. With