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 157<br />
related to "Craspeditts" tenuis (von Kocnen), which this author regards aa of Hauterivian<br />
age, Spath cites other species of this genus in tho lower Hauterivian zones<br />
at Speeton, England. The holotype has the following dimensions (partly estimated):<br />
greatest diameter, 185 nun.; width of umbilicus, 66 mm.; height of whorl,<br />
55mm.; thickness of whorl, 60 mm.; umbilical ratio, 0.336:1.<br />
The species is found at Locality 1353 (Calif. Acad. Sci.), associated with Lytoeeras<br />
traski nov., Phylloceras occidentals nov., Aeroteuthis kemensit nov., /noceramus<br />
colonicus nov., and many other molluscan species of Hauterivian age.<br />
.Yeoerofpedifos recloria Anderson, n. sp.<br />
(?i*C« 33, firurt 3)<br />
Shell of moderate eiie, discoidal anguatumhilicate, moderately inflated, umbilical<br />
walls steep, rounded above, merging with the slightly convex sides; sides with many<br />
costae; umbilical ribs arising on the walls, inclined backward, curving strongly<br />
on crossing the border, swelling slightly near the middle of the side, and branching<br />
here into four, sometimes five, finer costae, all with forward inclination crossing the<br />
side, and also tbe periphery, without interruption; suture line only imperfectly<br />
exposed. The holotype of the species (Calif, Acad- Sci. type Coll.) was found at the<br />
mouth of Rector Creek, near Ono, Shasta County, about 50 feet beneath the bed<br />
containing the preceding species. It appears to belong to the group of N. semilaevis<br />
(von Kocnen), although occurring in somewhat younger beds, which are regarded as<br />
lower Hauterivian in age. Von Koenen refers his Bpecies with some doubt to tho<br />
lower Valanginian of Osterwald.<br />
The holotype of the present species consists of an inner coil, septate throughout,<br />
having the following dimensions: greatest diameter, S3 mm.; width of umbilicus, 11<br />
mm.; height of whorl, 25 mm.; greatest thickness, 25 mm.; umbilical ratio, 0.208:1.<br />
Afeocratpeditea siffnaiis Anderson, n. sp.<br />
(Pint* M, %uru 1)<br />
Shell rather large, discoidal, slightly inflated, section of whorl flatly semi-elliptical,<br />
aides slightly flattened; umbilicus of moderate width, walla abrupt, rounded<br />
on the border; ventral border rounded; sides numerously coetate, the riba arising<br />
on the umbilical walls as coarse ridges, inclining at firBt backward, but above the<br />
umbilical border bending gently forward, then dividing into two or three rather<br />
straight costae, which are rather fine and rounded, and which cross the periphery<br />
without interruption; suture line partly shown in the figure. The holotype (Calif.<br />
Acad, Sci. type Coll.) was found by Mr. M. A. Wilcox on the eastern portion of his<br />
ranch, 5 miles north of Paskenta, Tehama County. According to bis statements it<br />
was found abovo the zone containing -4 ueella erasiuollis, which also contains Dichotomies,<br />
Berriasella, and Bochianitca paskentaenaia, nov., but its more exact position<br />
is not yet known. The holotype has the following dimensions: greatest diameter,<br />
143 mm.; diameter of umbilicus, 56 mm.; height of whorl, AS mm.; thickness of whorl,<br />
3d mm.; umbilical ratio, 0.392:1.<br />
The holotype was not found associated with any other recognized form, although<br />
it was not far from the position occupied by the foregoing and the following species.<br />
Both are thought to represent the lower beds of the Horsetown group in the district<br />
between McCarthy Creek and Elder Creek, Tehama County; they aid, therefore, in<br />
tbe correlation of these beds with those of the Ono zone in the Cottonwood district,<br />
Shasta County. Species of this genus have been found near Garzas Creek, on the<br />
east flank of the Diablo Range, on the west border of the San Joaquin Valley.