LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

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description of species 161 (Pictet). The shell is rather large, broadly umbilicate, finely coatate, but tittle involute; section of whorl semi-elliptical; having about 260 costae to tbe whorl, arising partly in the umbilical bullae, from which they separate into two or three thread-like, somewhat sinuous ribs, at first inclining forward, then rising normally on the side, then slightly backward, and again forward, crossing tbe periphery without interruption; the major ribs, below the umbilical bullae, inclining forward in the dorsal zone; between the umbilical bullae, four to eight simple, single costae arising in the dorsal rone parallel to the others; suture lines not yet known. A row of minute tubercules are visible on either side of the ventral zone on each second or third rib. The holotype (Calif. Acad. Sci. type Coll.) was found at Locality 1065 (Calif. Acad. Sci.) on Duncan Creek, three-quarters of a mile north of the Ono-Beegum road. It consists of a little less than one-quarter of a whorl; as nearly as can be estimated, the complete example had the following dimensions: greatest diameter, 147 mm.; width of umbilicus, S3 mm.; height of whorl, 33 mm.; thickness of whorl, 33 mm. This example was found in a hard, dark calcareous concretionary block, similar in character to the overlying beds, and mingled with others In a broeeiated zone, brought to tbe surface by faulting from possibly lower beds. With it were found the holotype of jV«ocomi(« rtiMetft nov. and a large fragment of Crioterat iaJum Gabb. This occurrence seems to represent the lowest fossil-bearing bed yet found in the Shasta series in the Cottonwood district, although lower beds are exposed farther to the south. HOPLITIDAE Hyatt, emend. Spath In tbe Lower Cretaceous of California and Oregon there are few Hoplitidg as compared with contemporary deposits in western Europe or in western Argentina. Forms with sulcata, or even flattened, periphery are not abundant in the Paskenta group, and they disappear before the close of the Valaugintan, although supposedly derivative forms appear in the middle part of the Horsetown group. There ore no known representatives of either Leopoldia or AcontAodt«ct», and few of either Thurmannia or Sleueroceraa (s. a,). In restricted areas in the middle or upper part of tbe Paskenta group are found a few berriasellids of various kinds, especially in the district south of the delta where the fauna ia dominated by heavy-aholled forms of Aucella. Few hoplitida have been found in the Cottonwood district north of the delta, as compared to the number at the south; only two examples have been found in the Cottonwood district, and three species in tho Riddle district in Oregon, all of which have come from the Paskenta group. Most of them are regarded as either Berriatelki or tfcocomitca. In all these forms the periphery is rounded, or only alightly flattened. The ribs are comparatively simple, or but slightly flexed, and, when divided, the branching occurs high on tho aide of the whorl, as in the berriasellids. Neoeemilsa is found in the Paskenta group in the districts north and south of the delta in California, and in the Riddle district in Oregon, in beds of this group, although not tbe same species, TJiurirKinmcv has been found both north and south of the delta area in California, but none in the district about Riddle, nor in any part of the Horsetown group, If derivatives of any of these types occur in strata later than the Paskenta, they must be among the Horsetown forma here grouped under Parahoplitidae Spath, but they do not appear before late Hauterivian time, and then not in great numbers. In the middle part of the Horsetown group (Aptian) appear Parahoplitaidei Spath, and a little higher ParaAopfttcs Anthula and Acanthoplites Siniow, The latter genus continues into the Hulen beds (lower Albian), and with them, possibly belonging in the same lineage, forms of Chelomeetat and Doucillciccrai.
162 lower chetaceous deposits ijf california and oregon In the Perrin aone, somewhat higher in the Hulen hods, there axe many species of Sonneratia and a few of Cleomeeraa, included by Whitehouse in Cleoniceratidae. The relation of these to Hoplitidae is not clear, although like ifaiufanftccrot and others that follow they may be regarded as derivatives of hoplitid types. The boplitids (s. «.) now known from the Paskenta group in California and Oregon may be summarized aa follows: North of the delta, California South of the delta Upper Valanginian TViurmanm'a ;upi(ar nov. Berriaatlla angulaia (Stanton) B. ap., ttov. BocJitam'fra paskenlacnsie nov. Lower, or Middle Valanginian Ncocomitee rueselli nov. Neoctmitea jenkiiui nov. iV. sp. nov. A r . tlippi nov, ThuTmannia paakentae nov. In Oregon Bcrriaeella eroMiplicota (Stanton) B, ap. nov. Btrriatella 1 hyatti (Stanton) Bochiam'let poekentaemii nov. IVeocomite* riddleruit nov, Lylicoeetat paekardi nov. None of the forma possibly derivative from Hoplitidae can be confidently traced to any of the species in the foregoing list, whereas most of tbe forms included under Parahoplitidae have near analogues in the Lower Cretaceous of southwest Aaia or in contemporary deposits in Europe. Thurmannia Hyatt Thurmannia paekenlae Anderson, n. sp. (PtAto ». B
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GEOLOGICAL SOCIETY OF AMERICA SPECI
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CONTENTS Page ITFTHONCCTXOK AJFD AC
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CONTENTS Vli Page PAHT II. PAUBOKTO
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X XLLTTSTBATIONS Plate Faolng page
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2 LOWER CRETACEOUS DEPOSITS INT CAL
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10 LOWER CRETACEOUS DEPOSITS INT CA
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IS LOWER CRETACEOUS DEPOSITS INT CA
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32 LOWER CRETACEOUS DEPOSITS IN CAM
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e s• cj T3 1 2 s tf 5!* p ' a Pas
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42 LOWER CBETACEOOfl DEPOSITS IN CA
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SO LOWER CRETACEOUS DEPOSITS INT CA
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52 LOWEB CRETACEOt?fi DEPOSITS EJ C
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56 3WJWEH CRETACEOUS DEPOSITS IN CA
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60 LOWER CRETACEOUS DEPOSITS IN CAL
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62 LOWEB CBETACEODB DEPOSITS IN CAL
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4 LOWER CRETACEOUS DEPOSITS IN CALI
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68 LOWER CRETACEQTJ9 DEPOBITfl IN C
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0 LOWER CRETACEOUS DEPOSITS IN CALI
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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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106 3WJWEH CRETACEOUS DEPOSITS IN C
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108 LOWSB CEETACEOUB DEPOSITS IN CA
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212 LOWER CRETACEOtffi DEPOSITS IN
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214 loweR cretaceotffi deposits iN
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216 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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240 LOWER CRETACEOUS DEPOSITS IN 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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ANDERSON PLATE Tt
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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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