LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

DESCRIPTION OF SPECIES 105
been found near the base of this group miles northeast of Mount Diablo by HoBeP
and Staples (Louderback, 1933), and also in basal conglomerates on the northwest
flank of tbe mountain. It also occurs near Orchard Peak, Kern County, where it has
been collected by Hating and Church in tbe Devils Den district
Aucella nolida (Lahuscn)
(Pint* 10, flcurat 3, 4)
•AuccHfl cgncen(Wc9 var, Wwrcs, TJ. S. Geol- Surv., Bull. 4, 1884, p. 13,14, pi. fl, fig. S;
"Fossil Point," Port Miiller, Alaska; tf. S. Geol. Surv., Men. 13, 1B8S, p. 232,
pi. 6, fig. 13.
Aucdla crtMricattis var. wlida LABTOSBN, Mem. Com. Geol. St. Petersburg, vol. 3,
no, 1, 18S8, pi. 5, figs. 14,15; Lower Cretaceous of Russia.
Aveella solida (Lihusen) PAVLOW, Sac. Imper. Nat. Moscou, Nouv. Mem. T, 17,
1907, p. 64, pi. figs. 24a, b, c; Lower jNeocomi&n of Russia; figs. 25,26; Shelton
Ranch, near Paskenta, Tehama County, California,
This species has been found with A, infiata, A. utieHotde^ and Lyiocerat m(«m)jt,
nov., in the lower beds of the Paskenta group in its type district, and in the same
horizon in the Devils Den district, Kern County, where it was collected by Keuma
and Church, It has also been collected by C. F, Averill at Big Bar, Trinity County,
associated with A, cratta and various plant remains, probably at one of the localities
mentioned by Diller (1908, p. 379-382). According to Pavlow the species is found
in the Lower Cretaceous of Russia, in the zone of Svhcraepeditee staiomphalue
(Pavlow), which bas been regarded as an Infra-Valanginian horizon in Russia and
in England.
AuceUa uncitoidet Pavlow
Aucella piochii vox. ouala STANTON, U. S. Geo!. Surv,, Bull. 133, 1895, p. 43, pi. 4,
fig. 14 only; type district of the Paskenta group, Tehama County.
Aucella undloidee PAVLOW, SOO. Imper. Nat. Moscou, Nouv. Mem. T. 17, 1907,
p. 81, pi. 5, figs. 14,15a, b; Lower Neocomian of Tobolsk and Simbirsk, Russia,
and of the Lower Cretaceous in California.
This species is most abundant in the lower beds of the Paskenta, group in its type
district, especially on McCarthy Creek, western Tehama County, where it is associated
with A, inflata, A. toiida, and Lylocerae eatwrnale, nov,, and with Phyllacerat
cf, kftOTDifierwa Stanton. According to Pavlow the species occurs in Russia in the
tone of SuberatpediUa stenomphalue (Pavlow), thus indicating a low position in the
Cretaceous sequence. Svbcratpeditei stenomphalua is regarded as an index fossil ;
Spath places it near the top of the Infra-Valanginian in the standard section of
Europe.
South of Paakenta this apceies has been found at a number of places near the base
of the group, as near Elk Creek village, Glenn County. Croob has collected the
species with A. erasrieollie, Lytoceras cf, eaivmale, and others from the lower beds
of the Paskenta group at the north end of the Berryeaaa Valley, Napa County. This
locality is on the west side of Eticura Creek, 3 milee above its mouth, and half a
mile southwest of the Foster ranch. The coarse sandy beds here form the local base
of tbe group, resting upon serpentina and other basement rocks.
Aucella piriformis L&huaen
(Pl*te a, STURM 3,
AuccHa concentrica y«r. WHITE, U. S. Geol. Surv., Bull. 4, 18S4, p. 13,14, pi. 6, figs. 6,
7; "Fossil Point," Port Millar, Alaska, collected by W. H. Dalt.