Geology and Paleontology of Canal Zone and Adjoining ... - USGS

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GASTROPODS: EULIMIDAE. MARGINELLIDAE TO HELMINTHOGLYPTIDAE 303 NEW GENERIC AND SUBGENERIC NAMES The following new generic and subgeneric names are proposed. Dolostoma, Turridae, Mangeliinae. Type: Dolostoma anorhepes Woodring, n. sp., Gatun formation, Miocene, p. 398. Gender neuter. Euglyphostoma, 'subgenus of Glyphostoma, Turridae, Mangeliinae. Type: Glyphostoma partefilosa Dall, Gulf of Cali fornia and west coast of Baja California, p. 401. Gender neuter. Floribetta, Pliilinidae. Type: Dolabella aldrichi Dall, Miocene, Florida, Canal Zone, Cuba, p. 420. Gender feminine. Lecattia, subgenus of AverelUa, Helminthoglyptidse, Xanthonycinae. Type: AverelMa (Lecallia) stewarti Woodring, n. sp., marine member of Bohio(?) formation, late Eocene or early Oligocene, p. 429. Gender neuter. Paleocavolina, subgenus of Cavolina, Cavolinidae. Type: Cavolina (Paleocavolina) xenica Woodring, n. sp., Caimito formation, Oligocene, p. 428. Gen der feminine. Rhiglypliostoma, subgenus of
304 GEOLOGY AND PALEONTOLOGY OF CANAL ZONE Gastropods from Gatuncillo formation and occurrence elsewhere of same or related species Continued Species from Gatuncillo formation Galeodea? cf. G. nodosa (Solander). Yasila aff. Y. paytensis Olsson_ Xancus cf. X. peruvianus (Olsson). Ctenilyria ctenista Woodring Persicula (Gibberula) cf. P. semen (Lea). Conus cf. C. sauridens Conrad-. 1 See following paragraph. 2 Described on p. 192 as Terebellum procerumf. Occurrence elsewhere of same or related species G. nodosa, middle to late Eocene, western Europe. Y. paytensis, late Eocene, Peru. X. peruvianus, middle Eocene to late Eocene or early Oligocene, Peru. C. coroni (Morlet), middle to to late Eocene, western Europe. P. semen, middle to late Eocene, soiitheastern U.S. C. sauridens, middle Eocene to early Oligocene, south eastern U.S. Hannatoma cf. H. emendorferi. was described on page 68 as Hannatoma? cf. H. emendorferi. Hundreds of specimens of this species from the new locality 23b show that it is indeed a Hannatoma, to be described in chapter E as a new species. Hannatoma is classified as a cerithid, not a thiarid. That it is a brackish genus is doubtful. The Gatuncillo gastropods have Tethyan (Velates, Terebellum and its subgenus Seraphs], western Euro pean, southeastern United States, West Indian, and Peruvian affinities. Those with southeastern United States and Peru are preponderant. Velates, Diroceri- thium, Hannatoma, Oostrombus, Seraphs, Ectinocliilus, CyprcBdia, Pachycrommium, Yasila, and Ctenilyria are extinct, and Terebellum survives only in the western Pacific Ocean. Age. No reasons are apparent for changing the age assignment in chapter A (p. 22), that is, that the bulk of the formation is of late Eocene age, but that it in cludes middle Eocene. Smaller foraminifera from locality 21 have been claimed to be of early Oligocene age (Jenkins, 1964), although at locality 23, practically along the strike, limestone yielded late Eocene larger foraminifera (p. 20). The Gatuncillo may include de posits of early Oligocene age, but the way to determine that is to examine a series of samples by trenching or augur-holing the upper part of the formation. With some effort that can be done. The Gatuncillo has been alleged to be of Aquitanian (early Miocene) age, with a liberal sprinkling here and there of reworked middle and late Eocene fossils (Eames and others, 1962, p. 36). As a matter of fact, the basis for that allegation the occurrence of Lepidocyclina pustulosa tobleri (Pliole- pidina of Eames and others) has been repudiated (Eames and others, 1968, p. 302). EOCENE OB OLIGOCENE SERIES MARINE MEMBER OF BOHIO(?) FORMATION The term "marine member of Bohio (?) formation" is a poor designation for this unit. Hill's casual desig nation "Vamos a Vamos [Vamos Vamos] beds" cannot be adopted, as it cannot be defined properly. His local ity, on Rio Chagres northwest of what is now Barro Colorado Island (locality 40), is now under the waters of Gatun Lake and the stratigraphic relations were uncertain before it was submerged. (See discussion p. 22-23.) If mapping can be carried out in the peninsula ending in Palenquilla Point (locality 41) and the peninsula to the west, it may be possible to define prop erly the strata containing this distinctive fauna. Species in the families covered in chapter D are tabulated below. In that and other distribution tables the designation "sp." in the locality columns indicates an incomplete or poorly preserved species that may or may not be the same as that in the species column, and the designation "?sp." indicates that the species is ques tioned. Symbols for relative frequency are as follows: Symbols used for relative frequency Number of speci Symbol mens R, rare. 1-2 F, few. - _ - -- - ---- - 3-5 C, common----_---__------------------------------ 6-20 A, abundant.- -- >20 Gastropods from marine member of Bohio (?) formation (Eulimidae, Turridae to Helminthoglyptidae [R, rare; F, few; C, common] Eulima cf . E. jacksonensis Niso (Niso) umbilicata (Lea)?___- Scaphander (Scaphander) cf. S. Retusa (Cylichnina) aff. R. Volvulella (Volvulella) aff. V. Averellia (Lecallia) stewarti Vamos Vamos 40a R R F 40d R R C R Localities F R Palen quilla Point 41 41b R C R R Trinidad F Island 42 ?sp. R If Zemaciesf sp. a is indeed a species of Zemacies, it is a representative of a Paleocene to Pliocene New Zealand-Australian genus heretofore unknown in America. Averellia stewarti, the oldest land snail in Central America, is associated with 40 marine species
Page 1 and 2: Geology and Paleontology of Canal Z
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Page 6 and 7: GEOLOGY AND PALEONTOLOGY OF CANAL Z
Page 8 and 9: GASTROPODS: ETJLIMIDAE, MARGINELLID
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Abderospira... ....................
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Cancellaria (Cancellaria) Continued
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Daphnella Continued pagera.........
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Page ischnum, Strioterebrum........
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PLATES 48-66
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GEOLOGICAL SURVEY PROFESSIONAL PAPE
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16 17 MIDDLE MIOCENE MOLLUSKS FROM
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GEOLOGICAL SURVEY MIDDLE MIOCENE MO
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MIDDLE MIOCENE MOLLUSKS FROM GATUN
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MIDDLE MIOCENE MOLLUSKS FROM GATUN
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