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Deep Sea Drilling Project Initial Reports Volume 15

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Deep Sea Drilling Project Initial Reports Volume 15 15. CALCAREOUS NANNOFOSSILS - LEG 15, DEEP SEA DRILLING PROJECT1 William W. Hay, Institute of Marine and Atmospheric Sciences, University of Miami, Miami, Florida and Fred M. Beaudry, NOAA, National Marine Fisheries Service, Monterey, California INTRODUCTION Chiasmolithus californicus (Sullivan) (ex Coccolithus) Chiasmolithus consuetus (Bramlette & Sullivan) (ex This account of the calcareous nannoplankton encoun- Coccolithus) tered in cores recovered on Leg 15 of the Deep Sea Drilling Chiasmolithus danicus (Brotzen) (ex Cribrosphaerella) Project is intended to serve as an aid in the selection of Chiasmolithus gigas (Bramlette & Sullivan) (ex Cocco- samples for more detailed studies. Indications of the lithus) abundance and state of preservation of calcareous Chiasmolithus grandis (Bramlette & Riedel) (ex Cocco- nannofossils are given in the sections of this volume dealing lithus) with the description of the cores. This chapter contains (1) Chiasmolithus oamaruensis (Deflandre) (ex Tremalithus) a list of the species recognized; (2) a summary of the Chiasmolithus solitus (Bramlette & Sullivan) (ex highest and lowest occurrence surfaces and zones used to Coccolithus) determine stratigraphic position of samples, with data on Chiasmolithus sp. (isolated rims) the position of each surface in each of the holes cored; (3) a Chiastozygus plicatus Gartner series of tables presenting data on the abundances of the Chiastozygus sp. species recognized in each of the samples examined; and Coccolithus apomnemoneumus Hay & Mohler (4) a special section on the Pleistocene calcareous Coccolithus carteri (Wallich) (ex Coccosphaera) nannofossils found in Holes 147, 148,149, and 154A. Coccolithus cavus Hay & Mohler Coccolithus crassus Bramlette & Sullivan SPECIES RECOGNIZED Coccolithus pataecus Gartner The following list includes all of the species which have ^Coccolithus pelagicus (Wallich) (ex Coccosphaera) been recognized and tabulated in Tables 1 through 30. The Coccolithus pseudocarteri Hay, Mohler, & Wade full species name and author is given with an indication of Coronocyclus nitescens (Kamptner) (ex Umbili- the genus in which the species was originally placed. Species cosphaera) discussed in more detail in the special section on the Coronocyclus serratus Hay, Mohler, & Wade Pleistocene are indicated with an asterisk. The original Cretarhabdus conicus Bramlette & Martini descriptions of the other species can be found by consulting Cretarhabdus crenulatus Bramlette & Martini the annotated indices and bibliographies of the calcareous Cribrosphaera ehrenbergi Arkhangelskü nannoplankton published by Loeblich and Tappan (1966, Cribrosphaera linea (Gartner) (ex Cribrosphaerella) 1968, 1969, 1970a, 1970b). Cruciplacolithus tenuis (Stradner) (ex Heliorthus) Actinozygus splendens (Deflandre) (ex Rhabdolithus) Cyclicargolithus floridanus (Roth & Hay) (ex Cocco- Ahmuellerella octoradiata (Gorka) (ex Discolithus) lithus) Arkhangelskiella costata Gartner *Cyclococcolithina leptopora (Murray & Blackman) (ex Arkhangelskiella cymbiformis Vekshina Coccosphaera) Arkhangelskiella ethmopora Bukry Cyclococcolithina macintyrei (Bukry & Bramlette) (ex Arkhangelskiella parca Stradner Cyclococcolithus) Arkhangelskiella specillata Vekshina Cyclolithella annula (Cohen) (ex Coccolithites) *Braarudosphaera bigelowi (Gran & Braarud) (ex Cylindralithus sp. Pontosphaera) Discoaster adamanteus Bramlette & Wilcoxon Campylosphaera dela (Bramlette & Sullivan) (ex Discoaster aster Bramlette & Riedel Coccolithites) Discoaster asymmetricus Gartner Catinaster calyculus Martini & Bramlette Discoaster aulakos Gartner Catinaster coalitus Martini & Bramlette Discoaster barbadiensis Tan Sin Hok *Ceratolithus cristatus Kamptner Discoaster binodosus Martini Ceratolithus rugosus Bukry & Bramlette Discoaster bollii Martini & Bramlette Ceratolithus tricorniculatus Gartner Discoaster brouweri brouweri Tan Sin Hok (= Discoaster Chiasmolithus bidens (Bramlette & Sullivan) (ex brouweri) Coccolithus) ^Discoaster brouweri rutellus Gartner Discoaster brouweri subsp. tamalis Kamptner (= Discoaster tamalis Kamptner) 1 Research supported by the Oceanography Section, National Discoaster brouweri subsp. tridenus Kamptner (= Science Foundation, NSF Grant GA-31969X. Discoaster tridenus Kamptner) 625 W. W. HAY, F. M. BEAUDRY Discoaster brouweri subsp. triradiatus Tan Sin Hok (= Helicopontosphaera intermedia (Martini) (ex Helicos- Discoaster triradiatus Tan Sin Hok) phaera) Discoaster challengeri Bramlette & Riedel ^Helicopontosphaera kamptneri Hay & Mohler Discoaster deflandrei Bramlette & Riedel Helicopontosphaera parallela (Bramlette & Wilcoxon) Discoaster diastypus Bramlette & Sullivan (ex Helicosphaera) Discoaster dilatus Hay Helicopontosphaera recta (Haq) (ex Helicosphaera; H. Discoaster divaricatus Hay seminulum ssp. recta) Discoaster druggi Bramlette & Wilcoxon ^Helicopontosphaera sellii Bukry & Bramlette Discoaster exilis Martini & Bramlette ^Helicopontosphaera wallichi (Lohmann) (ex Cocco- Discoaster extensus Hay lithophora) Discoaster gemmeus Stradner Heliolithus kleinpelli Sullivan Discoaster gemmifer Stradner Heliolithus cf. riedeli Bramlette & Riedel Discoaster hamatus Martini & Bramlette Heliorthus concinnus (Martini) (ex Zygolithus) Discoaster kugleri Martini & Bramlette Kamptnerius magnificus Deflandre Discoaster lenticularis Bramlette & Sullivan Kamptnerius punctatus Stradner Discoaster lidzi Hay Lithastrinus grilli Stradner Discoaster lodoensis Bramlette & Riedel Lithraphidites carniolensis Deflandre Discoaster mediosus Bramlette & Sullivan Lithraphidites quadratus Bramlette & Martini Discoaster multiradiatus Bramlette & Riedel "Loxolithus " Noel Discoaster neohamatus Bukry & Bramlette Lucianorhabdus cayeuxi Deflandre Discoaster nephados Hay Markalius astroporus (Stradner) (ex Cyclococcolithus) Discoaster nobilis Martini Marthasterites furcatus (Deflandre) (ex Discoaster) *Discoaster pentaradiatus Tan Sin Hok Marthasterites tribrachiatus (Bramlette & Riedel) (ex Discoaster perclarus Hay Discoaster) Discoaster perplexus Bramlette & Riedel Microrhabdulus decoratus Deflandre Discoaster phyllodus Hay Microrhabdulus stradneri Bramlette & Martini Discoaster quinqueramus Gartner Micula staurophora (Gardet) (ex Discoaster) Discoaster saipanensis Bramlette & Riedel Neococcolithes protenus (Bramlette & Sullivan) (ex Discoaster saundersi Hay Zygolithus) Discoaster sp. Oolithotus antillarum (Cohen) (ex Discolithus) Discoaster sublodoensis Bramlette & Sullivan Parhabdolithus embergeri (Noel) (ex Discolithus) Discoaster subsurculus Gartner Pontosphaera discopora Schiller ^Discoaster surculus Martini & Bramlette ^Pontosphaera scutellum Kamptner Discoaster tani nodifer Bramlette & Riedel ^Pontosphaera spp. Discoaster tani ornatus Bramlette & Wilcoxon Prediscosphaera cretacea (Arkhangelskii) (ex Coccolitho- Discoaster tani tani Bramlette & Riedel phora) Discoaster trinidadensis Hay Prinsius bisulcus Hay & Mohler Discoaster variabilis Martini & Bramlette *Pseudoemiliania lacunosa Kamptner ex Gartner Discoaster woodringi Bramlette & Riedel Reticulofenestra bisecta (Hay, Mohler, & Wade) (ex Discoasteroides kuepperi (Stradner) (ex Discoaster) Syracosphaera) Discolithina japonica Takayami Reticulofenestra cf. pseudoumbilica Gartner (very small *Discolithina cf. macropora (Deflandre) specimens) *Discolithina spp. Reticulofenestra pseudoumbilica Gartner *"Discolithus" phaseolus Black & Barnes Reticulofenestra umbilica (Levin) (ex Coccolithus) *Discosphaera tubifera (Murray & Blackman) (ex *Rhabdosphaera clavigera Murray & Blackman Rhabdosphaera) *Rhabdosphaera stylifera Lohmann Eiffellithus turriseiffeli (Deflandre) (ex Zygolithus) *Scapholithus fossilis Deflandre *Ellipsodiscoaster lidzi Boudreaux & Hay *Scyphosphaera apsteini Lohmann *Emiliania huxleyi (Lohmann) (ex Pontosphaera) Sphenolithus abies Deflandre Ericsonia subpertusa Hay & Mohler Sphenolithus anarrhopus Bukry & Bramlette Fasciculithus involutus Bramlette & Sullivan Sphenolithus belemnos Bramlette & Wilcoxon Fasciculithus janii Perch-Nielsen Sphenolithus ciperoensis Bramlette & Wilcoxon Fasciculithus tympaniformis Hay & Mohler Sphenolithus heteromorphus Deflandre *Gephyrocapsa californiensis Kamptner Sphenolithus furcatolithoides Locker *Gephyrocapsa kamptneri Deflandre Sphenolithus moriformis Bronnimann & Stradner *Gephyrocapsa oceanica Kamptner Sphenolithus neoabies Bukry & Bramlette *Gephyrocapsa parallela Beaudry & Hay, n. sp. Sphenolithus pacificus Martini *Gephyrocapsa sinuosa Beaudry & Hay, n. sp. Sphenolithus predistentus Bramlette & Wilcoxon *Gephyrocapsa sp. (isolated rims) Sphenolithus radians Deflandre Glaukolithus diplogrammus (Deflandre) (ex Zygolithus) *Syracosphaera clava Beaudry & Hay, n. sp. Helicopontosphaera ampliaperta (Bramlette & Wilcoxon) *Syracosphaera decussata Beaudry & Hay, n. sp. (ex Helicosphaera) * Syracosphaera histrica Kamptner 626 CALCAREOUS NANNOFOSSILS *Syracosphaera jonesi (Cohen) (ex Cricolithus) Site 146 Syracosphaera labrosa Bukry & Bramlette Calcareous nannoplankton occur in the uppermost part *Syracosphaera pulchra Lohmann of Section 1 and in the core catcher sample of Core 1 * Syracosphaera sp. (Table 1). Both assemblages are similar, and contain Tetralithus aculeus (Stradner) (ex Zygrhablithus) Discoaster brouweri, D. pentaradiatus, D. quinqueramus, Tetralithus cf. mums Martini and other species characteristic of the late Miocene Tetralithus gothicus Deflandre Discoaster quinqueramus Zone. All other samples from Tetralithus gothicus trifidus Stradner Core 1 proved to be barren of these fossils,
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