Publication Date:
2023-07-10
Description:
Benthic foraminifers of the Coniacian-Santonian through the Paleocene were recovered from a continuous pelagic carbonate section from Hole 516F on the Rio Grande Rise. Sixty-five genera and 153 species have been identified, most of which have been reported from other localities. Bathyal depths are reflected in the benthic assemblages dominated by gavelinellids (Gavelinella beccariiformis, G. velascoensis), Nuttallides truempyi, and various gyroidinids and buliminids. Rapid subsidence during the Coniacian-Santonian from nearshore to upper to middle bathyal depths was followed by much reduced subsidence, with the Campanian-Paleocene interval accumulating at middle bathyal to lower bathyal depths.
A census study based on detailed sampling reveals major changes in benthic faunal composition at the Cretaceous/Tertiary boundary transition. It was a time of rapid turnover, with the extinctions of numerous species and the introduction of many new species. Overall, species diversity decreases about 20%, and approximately one-third of latest Maestrichtian species do not survive to the end of the Cretaceous. This shift indicates a significant environmental change in the deep sea, the precise nature of which is not apparent from the foraminifers or their enclosing sediments.
Keywords:
72-516F; Alabamina creta; Allomorphina cretacea; Allomorphina minuta; Allomorphina trochoides; Ammodiscus cretaceus; Anomalinoides welleri; Aragonia semireticulata; Aragonia velascoensis; Astacolus crepidulus; Astacolus gibber; Astacolus jarvisi; Astacolus richteri; Bandyella beckmanni; Bandyella greatvalleyensis; Bathysiphon sp.; Bolivinoides delicatulus; Bolivinoides draco draco; Bolivinoides draco miliaris; Bolivinoides granulatus; Bolivinoides strigillatus; Bulimina midwayensis; Bulimina trinitatensis; Bulimina tuxpamensis; Bulimina velascoensis; Buliminella beaumonti; Ceratobulimina perplexa; Cibicides excavata; Cibicidoides dayi; Cibicidoides pseudoperlucidus; Coryphostoma incrassata; Coryphostoma limonense; Counting 〉150 µm fraction; Deep Sea Drilling Project; Dentalina alternata; Dentalina basiplanata; Dentalina catenula; Dentalina gracilis; Dentalina legumen; Dentalina spp.; Dorothia beloides; Dorothia bulletta; Dorothia cubensis; Dorothia oxycona; Dorothia pupa; Dorothia retusa; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Ellipsoglandulina exponens; Ellipsoidella robusta; Ellipsopolymorphina velascoensis; Eouvigerina americana; Eouvigerina excavata; Fissurina alata; Fissurina oblonga; Fissurina orbignyana; Foraminifera, benthic; Foraminifera, benthic, number of species; Frondicularia jarvisi; Gaudryina aisanna; Gaudryina laevigata; Gaudryina pyramidata; Gavelinella beccariiformis; Gavelinella costata; Gavelinella danica; Gavelinella eriksdalensis; Gavelinella hyphalus; Gavelinella monterelensis; Gavelinella nacatochensis; Gavelinella sp.; Gavelinella stephensoni; Gavelinella velascoensis; Globorotalites conicus; Globorotalites multiseptus; Globulina lacrima; Globulina subsphaerica; Glomar Challenger; Glomospira corona; Glomospira gordialis; Guttulina caudata; Guttulina communis; Gyroidinoides beisseli; Gyroidinoides depressus; Gyroidinoides girardana; Gyroidinoides globosus; Gyroidinoides goudkoffi; Gyroidinoides nitidus; Gyroidinoides octocameratus; Gyroidinoides praeglobosa; Gyroidinoides quadratus; Lagena gracilis; Lagena hispida; Lagena sulcata; Leg72; Lenticulina acuta; Lenticulina macrodisca; Lenticulina midwayensis; Lenticulina muensteri; Lenticulina spp.; Lenticulina velascoensis; Lenticulina whitei; Lingulina pygmaea; Loxostomum eleyi; Marginulina austinana; Marginulina hamutoides; Marginulina oligostegia; Marginulina siliqua; Marginulinopsis texaensis; Neoeponides hillebrandti; Neoeponides lunata; Neoflabellina semireticulata; Nodosaria velascoensis; Nonionella austinana; Nonion havanense; Nuttallides crassaformis; Nuttallides truempyi; Nuttallinella florealis; Nuttallinella sp.; Oolina apiculata; Oolina delicata; Oolina morsei; Oridorsalis biconvexus; Oridorsalis umbonatus; Osangularia cordieriana; Osangularia lens; Osangularia plummerae; Osangularia velascoensis; Period; Planularia liebusi; Pleurostomella austinana; Pleurostomella subnodosa; Pleurostomella torta; Praebulimina carseyae; Praebulimina cushmani; Praebulimina reussi; Praebulimina triangularis; Pseudonodosaria bistegia; Pseudonodosaria manifesta; Pseudouvigerina plummerae; Pullenia coryelli; Pullenia cretacea; Pullenia jarvisi; Pullenia minuta; Pyramidina rudita; Quadrimorphina allomorphinoides; Reophax trinitatensis; Reussella szajnochae; Rhabdammina discreta; Sample code/label; Saracenaria navicula; Saracenaria triangularis; South Atlantic/CONT RISE; Spiroplectammina dentata; Spiroplectammina praelonga; Spiroplectammina sigmoidina; Spiroplectammina spectabilis; Spiroplectammina subhaeringensis; Stage; Stensioeina pommerana; Stilostomella plummerae; Stilostomella pseudoscripta; Tritaxia amorpha; Tritaxia aspera; Tritaxia globulifera; Tritaxia trilatera; Trochammina boehmi; Vaginulina trilobata; Valvulineria lenticula
Type:
Dataset
Format:
text/tab-separated-values, 10465 data points
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