Publication Date:
2023-07-10
Description:
From 12 radiolarian-rich claystone samples of the DSDP-Leg 25, Site 249, situated in the western Indian Ocean southwest of Madagascar 4 species of agglutinated and 38 species of calcareous benthonic foraminifera are described, 13 of them in open nomenclature. As a lot of Valanginian species and Gavelinella barremiana occur in the foraminiferal faunas described here a Valanginian-Hauterivian age is assigned to them. These microfaunas investigated here yield some index species characteristic in the Lower Cretaceous deposits of Northern Germany and also from the near-by Madagascar. Nodosariids dominate in a striking way with 36 species, especially of Astacolus, Citharina, Lenticulina, Lingulina, Marginulinopsis, Nodosaria, Saracenaria, and Vaginulina. Important Neocomian species well-known from other DSDP sites, namely Praedorothia ouachensis (SIGAL) and planktonic foraminifers, are missing. The microfaunas of Site 249 have to be derived from shelf areas.
Keywords:
25-249; Ammobaculites sp.; Astacolus cephalotes; Astacolus microdictyotus; Citharina harpa; Citharina sp.; Citharina truncata; Deep Sea Drilling Project; Dentalina debilis; Dentalina sp.; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Eoguttulina bilocularis; Fish remains; Foraminifera, benthic; Gavelinella barremiana; Globulina bucculenta; Glomar Challenger; Glomospirella gaultina; Indian Ocean//RIDGE; Leg25; Lenticulina nodosa; Lenticulina roemeri; Lenticulina saxonica; Lingulina biformis; Lingulina lamellata; Lingulina semiornata; Lingulina sp.; Lithologic unit/sequence; Marginulina caelata; Marginulina inaequalis; Marginulinopsis bettenstaedti; Marginulinopsis matutina; Nodosaria obscura; Nodosaria sp.; Ophiuroidea remains; Ostracoda; Paalzowella feifeli; Palmula crepidularis; Palmula malakialinensis; Palmula sp.; Porifera spiculae; Pseudonodosaria humilis; Radiolarians abundance; Ramulina tappanae; Reophax aff. eckernex; Reophax sp.; Sample code/label; Saracenaria crassicosta; Saracenaria lutanata; Tristix acutangulus; Vaginulina recta
Type:
Dataset
Format:
text/tab-separated-values, 600 data points
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