LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

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description 1 07 bpecieb 165 stratum is underlain by a thick sequence of conglomerates carrying in the upper part species of Aucella, of the lineage of .1 ucella enwicollis Kcyserling. Tbe holotype affords the fallowing measurements: greatest diameter, 68 mm.; diameter of umbilicus, fl-fi mm,; height of whorl, 34 mm.; thickness, 15 mm. AB many aa eight specimens of this species were obtained from the same stratum. The resemblance of this species to SuftjaynWia Spath (1921, p. 31) is interesting as suggesting a possible relationship of the latter to a Valanginian Hoplitid stock. NEOCOUITIDAB Spath 1924 Neocomite* Uhlig IfeacomiUt jenkinsi Anderson, n. ap.
166 lower crstacequ9 defobit3 in california and obegon on tbe sides, crossing tbe periphery without interruption; secondary ribs interpolated between the others, not extending into the umbilicus; total number of ribs (est,}, about 50 to the whorl; suture lines unknown. The holotype of this species (Calif. Acad. Sci. type Coll.), as found by R. Dana Russell at Locality 1635 on Duncan Creek, associated with Crioceras iaiim Gabb, Lyiocerae cf. traski, and Sptticeraa duticaitcnee nov., has tbe following dimensions: greatest diameter, 73 ram,; width of umbilicus, 13 mm.; height of whorl, mm.; thickness of whorl, 20 mm. This species, although thicker in section and possessing fewer ribs, seems to helong to the group represented by Neocomites stippi nov. It represents the lowest fossil-bearing bed exposed in the Shaata series of the Cottonwood district, although not the loweHt bed exposed in this area, This ia one of the two examples of Neoeomiiei that have been found in this district. Nctmomitet tiippi Anderson, n. sp. (PtAtO 2S, dfUTI S) Two fragmentary examples of a hoplitid species were found in the upper part of the "Aucella crassicaUi* zone" on McCarthy Creek, associated with Aueeifa era aa, Aucella crassiccllia, Aaroteuthis onwnrts, Lytaceras taiurnale nov., and other spcciea. Although incomplete, theae examples are sufficiently well preserved for generic determination and for partial description. Thay belong to the group represented by HopUlei (Neocomilet) angulicoatatue (d'Orbigny), although they have some char^ aetera of "Berriaeella" benecki (Stcuer) from tha Valanginian of western Argentine.. Tho section of the whorl is flatly elliptical and slightly inflated; sides eostats, the riba arising on the umbilical wall, forming on its borders elongated nodes from which some of them branch; others branch from above the middle of tha side, all curving gently forward and crossing the ventral ZGILG with a slight forward curve; umbilicus moderately wide, with abrupt walls; sutures closely crowded, showing a tout, much-divided lobes and saddles; lateral lobe somewhat extended, trifid, each branch terminating in long, slender digitoid points. The holotypa (Calif. Acad. Sci. type Coll.) was found by Mr. Thomas Stipp on the south bank of McCarthy Creek, about 1,000 feet beneath the zone containing Ncocomiics jenJcinei. The horizon is that Of the lower part of the Paskenta group (Infra-Valanginian) of the McCarthy Creek section. The nodes on the umbilical borders, more prominent on the shell than on the cast, somewhat resemble Kilian's (1010, pi. 1) figure of Thurmwnia boissieri (Pictet). Neocomites neocomiensii (d'Orbigny) (Plata S, Spue* S, 2s) Ammmitea neacamiensit D'ORDIGHT, Paleont. Francaise, vol, 1, 1340, p. 203, pi. 58, figs, 8-10; lower beds of the Neocomian terrain, central France. Only a single specimen sufficiently well preserved for illustration has been found in the Lower Cretaceous of California; this was obtained by N. L. Taliaferro in the Waltham Creek Valley, on tbe southwest quarter of section 17, T. 20 S,, ft. 13 E, M. D. M., north of the Coalings-Priest Valley road. In thia example the shell is Compressed, diaeoidal, ornamented by transverse costae, 71 in number, a little flexuous, bifurcating from small nodes on the umbilical border, and again dividing near the middle of the side into two, three, or mors costae as counted nejtr periphery; sides slightly inflated, thickest in the lower one-third of the aide, sloping toward the periphery; costae interrupted on the ventral zone, which is slightly excavated, and bordered by minute costal nodes; maximum width of ventral sone, 2 mm,; maximum
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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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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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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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