LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

99 LOWEB CBETACEODB DEPOSITS IN CALIFORNIA. AND OREGON
It may be that ia some cases errors have resulted, aud in fact they could
scarcely be avoided, but if this work were delayed until these and other
difficulties were removed, it would not soon be done. However, the remoteness
of this province from that of Europe and other regions from
which Lower Cretaceous faunas have been described affords some measure
of relief from the exactions imposed upon students working under the
shadow of older institutions. Whatever shortcomings may result from
these and other circumstances, it is believed that there are many students
of Meso&oic paleontology in this and other countries who will welcome
the new and significant matter contained in this contribution, even though
in the view of some it may seem defective. For such students this work
has been done.
ECHINODERMATA
Echinoderm remains are not abundant in the Pacific Coast Cretaceous,
aJthough in both California and Oregon they have been found sparingly
in the lowest stratigraphic group of the Shasta series, and also in the lower
part of the Chico series and in its later beds. Stanton (1895, p, 31} has
mentioned the discovery of spines and fragments of the test of Cidarts,
and joints of the column of Pentacritvus, on the Shelton ranch, north of
Paskenta, Tehama County, and the latter genus also at Stephenson's
on the Cold fork of Cottonwood Creek, Tehama County.
Clark later described these forms as far as their fragmentary condition
permitted; accounts of them are here given. At both localities these
fossils occur in the Paskenta group of the Shasta series, not far from its
local base, and incidentally indicate near-shore conditions of the strata
from which they came. Evidences connected with their occurrence and
their associates confirm this view. Stanton (1835, p. 22) also mentions
the finding of remains of PerUacrinus in beds of nearly the same age new-
Riddle, Oregon.
CIDA&IDAE Gray
Cidaris Leake
Cidarit tchamaensw Clark
Ctttori* tehamaemrie CXtA&K, XT. B, Geo!. 8nrv„ Mon. 51, 1916, p. 44, pi, 9, fie. 1;
Shelton'a ranch, 5 mi lea north of Fasten ta, Tehama County .—KEW, Univ.
Calif, Publ, Geo)., vol. 12, 1920, p. 54, pi. 3, 1; locality as above.
This species is described from a single apine, BS follows: "Test unknown. Spines
large and. dub-ahaped, witk rows ot granule* intending from neck to point of spine."
Length 30 nun.; width in thickest port, 12 mm.