LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

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description of species 179 greatest diameter, 91 mm.; width of umbilicus, 42 mm.; height of whorl, 26 mm,; thickness of whorl, 25 mm.; umhilical ratio, 0.401:1. This species greatly resembles .4canMopti
130 lower chetaceous deposits ijf california and oregon in almost the earliest beds of tbe Paskenta group, but at best they are ram, and the family does not attain prominence until the latter part Of Horsetown time (early-middle Albian). Prom this time on, they appear in increasing numbers up to the close of Horsetown time (late Albian) and they are plentiful in tbe lower beds of the Chico series (late Albian and Cenomanian time). It is not supposed that the several generic groups in this family have had local origin, although there are reasons for believing that most of them belong in a common lineage. Moreover, there appears to be sequential order in their appearance in the Great Valley embayments, and it may be possible to find there antecedents for some of them. Without attempting at this time a discussion as to their origin and development, we may at least indicate here a number of generic groups and their stratigraphies! sequence, as follows: Mdchiarite* Spath first appears in upper-middle Horsetown (mid-Aptian) time, and continues only to the baae of the Hulen beds (lower Albian time), Deamacerat Zittel (group of D, ooj/t), found only in upper Aptian horizons. Puzovia Bayle, found in upper bed* of the Horsetown group (upper Aptian to upper Albian time), continuing into the Chico series (Cenomanian time). De&maceraa (Lalidortdhi) (group of ZJ, mern'omt), appearing first in the Perrin zone with DouuiUeiceraa niamnullaltim var. (middle Albian time), but having its best development in the Neptune zone (upper-middle Albian time). Btudaniicerat Hitiel is found first in the Neptune zone, with the preceding, and continues into the Chico series (uppermost Albian time). It maybe added that Puzosia (group of P. planulata) is found with Ozyt rapid/xerox packardi nov. in the upper part of the Horsetown group (upper Albian); Desmoeeraa (group of D. jugate and D, alamottise nov.) also appears in the lower beds of the Chico series with Pemnflvtena injlatu var. These forms are followed in the Chico series by various others that are referable to either Deanwcerws, Puzoaia, or later to Haitericeras, but these will be considered at a later time, Spath bos proposed for certain Valanginian members of this family the generic name Eodeamoeeras, but no forms referable to thia group have yet been recognized in the California Cretaceous, or perhaps on the Pacific Coast. It may be noted in passing that in their stratigraphic order all the recognized genera of Ecsaoccratidae are preceded by the earlier groups of Parahoplitidae— namely, by Parahoplitoidea Spath, and, except for AfeJeAioriles of the Aptian, by several species of Parahoplilc*. Spath has supposed, however, that the family Deaanoccratidae includes a heterogeneous assemblage of types having origin in Phyllocer&tid&c or in part in Lytoceratidae, both of which abound in the lower beds of the Shasta series (Paskenta group). Dtamoccraa utH/i Anderson (Plata 10. fifura 4-7) Deemocerae voyi ANBEKSON, Calif. Acad. Sci., Pr., 3d ser., vol. 2, 1902, p. 100, pi. 3, figs. SO, 30; North fork of Cottonwood Creek, Shasta County. Shell rather small, discoidal or slightly inflated; umbilicus deep and narrow; ventral surface rounded, sides sloping gradually to the ventral border; marked by numerous fine flexuous growth lines and about six flexuous transversa grooves, seen more often on the cast; grooves bordered by a alight ridge on the shell i ridges more prominent on the periphery, here bending Strongly forward, forming a sinus; section of whorl semi-elliptical in specimens of 50 mm. diameter, whereas it is more nearly circular in younger shells, The involution is deep, the outer whorl embracing more than three-fourths of the preceding whorl. The suture line is Deamoccratid, similar
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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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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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126 lower chetaceous deposits ijf c
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Page 137 and 138: Turbo vrilburerutii STANTOK, U. 8.
Page 145 and 146: 138 lower cretaceous deposits in ca
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Page 179 and 180: 172 lowzh cbetaceous deposits in ca
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230 LiOWEH CRETACEOUS DEPOSITS IN C
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232 lower cretaceotffi deposits in
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334 LOWER CRETACEOtffi DEPOSITS IN
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236 LOWEB CRETACEOUS DEPOBTT6 EN CA
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238 LOWER CRETACEOtffi DEPOSITS IN
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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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