LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

48 LOWER CRETACEOUS DEPOSITS INT CALIFORNIA AND OREGON
examples of Lytoceras saturnale were obtained from beds near the base
of the group. Two and a half miles farther west, at Locality 1665 (Calif.
Acad. Sci.) on Duncan Creek, still tower beds are exposed, although the
lowest beds are here faulted down and hidden. From the somewhat
breceiated strata, and from blocks possibly brought up from beds now
concealed, were obtained Spiticeras duncanense nov., Neocomites rmseili
nov., Crioceras latum Gabb, Crioceras cf. nolani Kilian, and Hoplocrioceras
remandi (Gabb). These species may not all represent the same horizon,
but they show a low position in the Valanginian sequence, and therefore
ore low in the Paskenta group, although not from its lowest beds found in
the Cottonwood district, or in the district north of Thomes Creek.
On the J. Sylvester ranch, 2 miles south of Locality 1665, from beds
1000 feet higher in tbe section, were obtained Inoceramua ovatus Stanton
and Hoplocrioceras remandi (Gabb), The first of these, described from a
low part of the group near Elder Creek, occurs here also in nearly the same
stratigraphic level. The second species has also been found near the
Watson school on Roaring River nearly 1000 feet above the base of the
section.
In the western part of the Cottonwood district basal and near-basal
conglomerates occur at many places, as at Beegum Peak, and 2 miles to
the north. Some of these basal and near-basal conglomerates in the
Cottonwood district seem to mark the debouchure of streams entering the
embayment from the hinterland during early Cretaceous time. One
such stream, still carrying water, is at the big bend of the North fork of
Cottonwood Creek, where two branches of the stream emerge from the
crystalline rocks of the basement complex. The basal conglomerates at
this point are 40 to 100 feet thick. Some of the boulders have a diameter
of 2 OT 3 feet and consist of various types of rock.
A locality still farther west, at the base of the section, is near the old
well-known "Arbuckle Diggings," frequently noted by Gabb. From this
locality, Gabb listed a number of invertebrate species which he believed
had been found there. The position of the old mine is 12 miles west of
Ono, at the base of the series. Shales and thin-bedded sandstones formed
the "bed-rock" of the old diggings. Repeated search here during the last
few years has failed to discover any trace of molluscan fossils within a
radius of a mile about the old mine. The species listed by Gabb include
some that could not have come from this locality, and it is very doubtful
if any of them were taken from the mine itself. The list given by Gabb
(1864) follows:
"Criacmu" pcrcostatum Gabb Ammontfe* (rosfet Gabb
"Aneglaeeras" sp. undet. A. batesi Tr&ak
Baeuliiti chicotniis Traak
The species contained in this list represent three or more widely separated
horizonB in the Cottonwood district. Baculiies chicoensis belongs in the