LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

DESCRIPTION OF SPECIES 93
PENTACMNIUAE Gray (emend.)
Fentacrinua Blumenbacb
Penlacrinua tehamotnsu Clark
Penlocrxnut Ukomaensi* CLASK, U. S. Geol, Surv,, MOD. 54, 1315, p. 35, pi, 6, fig. 1;
flhelton's ranch, 5 miles north of Paakenta, Tehama County.
Clark describes the- species as follows; "Column composed of small medium sized
pentagonal joints, some with and acme without sharp reentering angles. Crenulated
ridges pentold. Column perforated by a small ciw&l." Diameter of joint,
3 to 9 mm.; tbicknew of joint, .5 to i nun.
This species ia among the oldest cchincderms found in the Cretaceous of California.
MO LLUS CO IDEA
BRACHIOPODA DumfcrsJ
RHTNCBONELUDAB Fischcr
flftimcAtwefia whitnetfi Gabb
TtrtbraUlLa Whitneyi GABB, Palcoat, Calif., vol. 2, 1866, p. 35. pi. 12, figs. 62, 02a;
"Mioccne," Napa County, California,
flAyrteftamfiia Wfertnsyt GABB, Paleont. Calif., vol, 2, 1869, p. 204, pi. 34, figs. 105,
105a, lOfib: Shuts group (Cretaceous), Colusa County—STANTON, U. S, Geol.
Surv., Bull. 133, 1805, p. 32, pi. 1, figs. 5-10; near Wilbur Springs, Colusa
County, California.
Stanton's account and excellent illustrations o( this spccics are quite adequate.
Its horizon is, however, one of primary importance in tho stratigraphy of this and
other West Coast Cretaceous areas. Stanton states that at its type locality it is
accompanied by PecCen complexicoUa, Modiola major, Luctna eoltttotmit, and other
species. All tbe species mentioned characterize the limestones found here and at
many other localities in California and Oregon. As Aucella cratia, A, inflata, A.
erasficollit, and other Lower Cretaceous apeeies are found in the sandy shales both
east and west of these limestones at tbe type locality, and at other places, there
should be no doubt that the entire fauna of these limestones is of Crctaceous age.
Similar evidences are found in other localities in which this species occurs. In
fact these limestones seem to represent only a local facias in the Lower Cretaceous
(Paskenta group) in the Coast Ranges of California and Oregon. The presence of
Knoxville strata near Wilbur Springs, beneath the lowest beds of the Paskenta
group, ia evident, but hero and at many other places the unconformable relations of
the two aencs is equally clear.
TEHEBK.VTELLIDAE King (emend. Beccher).
Terebratetta d'Orbigny
Terebratella ealifomica STANTOK, tl. S. Geol. Surv., Bull. 133, 1S9&, p. 33, pi. 1,
figs. IS, 13: near Stephenson's on Cold fork of Cottonwood Creek, Tehama
County,
The figures and description of this species by Stanton need no emendment, Tho
species was thought by Stanton to belong in "the upper part of the Knoxville beds,"
which in this paper constitutes the Paskenta group of the Shasta series, The field
position ftnd stratigraphic relations, as well as the species associated with the hole-