LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

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CRETACEOUS SEDIMENTARY DIVISIONS 45 here by a considerable variety of AueeUa, including tbe rugose, heavyshelled forms given in the list below. In this part of the group belongs the so-called "Avcella cramatllii zone," although this species itself seems to be somewhat rare. This list, although probably not complete, is representative of these beds, here at least, and should serve for their identification in other parts of the State, or of the West Coast. The cephalopod species found here include: flWamitna ttippi HOY. Lytaceras talurnalc nov. DicheUmiUM tthamaensii nay. Bochianitet pmkentaemi* nov. "Detmotera*" californicum Stanton Xcro(
46 LOWER CRETACEOUS DEPOSITS INT CALIFORNIA AND OREGON a considerable list of plants, nine of which were specifically named, with three others named only generically. These plants were determined by Knowlton, whose assignment could be interpreted to mean tbe uppermost beds of the Knoxville series, as here understood. The horizon is that of "Zone K," of an earlier contribution (Anderson, 1933, p. 1252). The foregoing list contains the most characteristic molluscon species found here in the lower part of the group. The upper portion of the group in this district is composed almost wholly of slightly indurated clay shales, in which there are occasional lenticular, but thin beds of limestone, and more rarely thin beds of sandstones. In the lower part of these shales on McCarthy Creek, not far east of the Burt ranch house, are found tfeocomite* jcnkinri nov., Thurmannia paekentae nov., Subaslicrta sp., AuceUa nuciformis Pavlow, A. terebraiuloidea Lahusen, and various plant remains. About 1200 feet higher in the section on McCarthy Creek were obtained a fragment of Lytoccras satumale and AuceUa piriformis, and with them a large leaf of a cycad species and other plant remains. In the dark shales not far above this horizon were found a small species of Lytaczraa ef. L. traski nov. and a small species of AuceUa. Farther south the upper shales of this group have not yielded determinable fossils. Such shales appear in the same stratigraphic position in the section as far south as the Berryessa Valley, but no fossils have been found in them. In lithological character these shales do not differ from those of the Horsetown group nor from shales in the Knoxville scries, as found farther west. The line of division between the Paskenta group and the overlying Horsetown beds in this district is not marked by any lithological change, and its position is often a matter of approximation or of doubt. Cctlonwood District.—In tbe northern part of the Cottonwood districtthat is, in the triangular area north of the Middle fork and west of Ono— there is a thick sequence of sandstones, sandy shales, and clear dusky shales, and at their base some bouldery conglomerates, The entire sequence lies below the fossil-bearing beds at Ono and beneath the conglomerates here regarded as forming the basal beds of tho Horsetown group. Stratigraphieally these shales and sandstones occupy the position of the Paskenta group as found in its type district. Westward from Ono this group becomes progressively thicker by the successive emergence of lower beds along its contact with the basement rocks. North of Roaring River the group varies in thickness from less than 1000 feet near Ono to nearly 4000 feet on the upper Roaring River. The Lower Cretaceous age of these beds is unquestionable, and, although faunally unlike those of the Paskenta group on McCarthy Creek, and northward, lacking its Aucellan fauna, it must be regarded as forming a facies of this group and as being of contemporary deposition. In its lithological order there is much similarity in the two districts, in that the lower half of the group is prevailingly
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98 LOWER CRETACEOUS DEPOSITS IN CAL
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98 LOWER CHETACEOUS DBPOfllTa IK CA
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100 3WJWEH CRETACEOUS DEPOSITS IN C
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102 LOWEB CBETACEQUS DEPOSITS IN CA
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104 LOWER CRETACEOUS DEPOSITS IN CA
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108 LOWSB CEETACEOUB DEPOSITS IN CA
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114 LOWER CHETACEOTJS DEF08JTS IN C
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118 loweb cbetaceodb deposits in ca
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120 loweb cbetaceodb DEPOSITS in ca
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122 loweb cbetaceodb depOSitS in ca
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124 lower chetaceous deposits ijf c
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Turbo vrilburerutii STANTOK, U. 8.
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138 lower cretaceous deposits in ca
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140 lower cretaceous deposits of ca
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166 lower crstacequ9 defobit3 in ca
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170 LOWER ChETACEOUS DEPOSITS Ijf C
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172 lowzh cbetaceous deposits in ca
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176 lower chetaceqtfs depobits in c
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182 lower cretaceotffi deposits IN
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184 lower cretaceotffi deposits in
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193 LOWER CRETACEOtffi DEPOSITS IN
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188 LOWER cretaceotffi deposits IN
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214 loweR cretaceotffi deposits iN
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222 lower CbETACEoUB depobits in ca
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224 lower cbetaceoub depobits in ca
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228 lower cbetaceoub depobits in ca
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230 LiOWEH CRETACEOUS DEPOSITS IN C
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236 LOWEB CRETACEOUS DEPOBTT6 EN CA
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242 LOWER CBETACEOtrS DEPOSITS IN C
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EXPLANATION OF PLATES 347 PLATE 2.
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EXPLANATION OF PLATES 249 PLATE 4,
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250 LOITER CRETACEOUS DEPOSITS IN C
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EXPLANATION OF PLATES 251 PLATE FL.
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EXPLANATION OF PLATES 253 PLATE 8
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EXPLANATION OF SPATES 255 PLATE 10.
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ANDERSON PLATE 30 CRETACEOUS FOSSIL
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EXPLANATION OF PLATES PLATE 14,-—
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EXPLAKATIOiT Ot PLATES 261 PLATE 10
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EXPLANATION OF PLATES 263 PLATE 18,
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PLATE 20.—CUBTACEOCS FOSSILS FROM
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ANDERSON PLATE M CRETACEOUS FOSSILS
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ANDEBSON PLATE 33 CRETACEOUS FOSSIL
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ANDEBSON CRETACEOUS FOSSILS FROM CA
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ANDERSON CRETACEOUS FOSSILS FROM CA
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ANDERSON CRETACEOUS FOSSILS FROM OR
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ANDERSON PLATE 4ft
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ANDKRSON PLATI S3
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CRETACEOUS FOSSILS FROM CALIFORNIA
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explanation op plates 281' PLATE 56
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2 loweb. chetaceous deposits in cal
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284 loweb. chetaceous deposits in c
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2 loweb. chetaceous deposits in cal
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290 loweb. chetaceous deposits In c
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explanation op plates 281' PLOATE 4
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392 loweb. chetaceous deposits IN c
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explanation' of plates 293 PLATE 48
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294 LOWEb. ChETACEOUS DEPOSITS IN C
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explanation op plates 281' PLATE SO
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296 LOWEb. ChETACEOUS DEPOSITS IN C
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explanation of plates 297 PLATE 52.
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explanation op plates PLATE 54.—-
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explanation op plates 281' PLATE S6
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explanation op plates PLATE 63.—C
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explanation op plates FLATS M.—CH
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312 lower cbxtace008 deposits in ca
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explanation op plates PLATE 70.—-
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324 lower cretaceous deposits itf c
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EXPLANATION OP PLATES 281' PLATE 72
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ANDERSON FUT1 TS CRETACEOUS FOSSILS
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ANDERSON CRETACEOUS FOSSIL FROM CAL
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ANDERSON PLATE 78 I CRETACEOUS FOSS
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330 Area flmwrwa, 9B (Mwrnfort) tuf
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332 index Dwcriptbni ol epociM, 90
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334 INDEX "JEotttmc/k" 191, IM uctD
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HTOBX AmAspftlu—tontinuti xliatfl
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338 Sawn. 173 Siakijrou, 31 Smith,
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LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

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