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GeoRef Categories
Era and Period
Epoch and Age
Book Series
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Availability
Rectoglandulina
Permian foraminifers of the Omolon Massif, northeastern Siberia, Russia Available to Purchase
1–3 - Rectoglandulina nucacea Karavaeva and Nestell, n. sp. 1 CRNGE no. ... Available to Purchase
1–4 - Rectoglandulina oviformis Karavaeva and Nestell, n. sp. 1 CRNGE no... Available to Purchase
1–2 - Rectoglandulina dolioliformis Karavaeva and Nestell, n. sp. 1 CRNG... Available to Purchase
Permian smaller foraminifers: taxonomy, biostratigraphy and biogeography Available to Purchase
Abstract: This review has been undertaken in order to present some interpretations about the biostratigraphy of the smaller foraminifers belonging to four classes present during the Permian: Fusulinata, Miliolata, Nodosariata and Textulariata. Biostratigraphic markers of these classes are principally known in the orders and superfamilies of Lasiodiscoidea, Bradyinoidea and Globivalvulinoidea (Fusulinata), Cornuspirida (Miliolata), and in the entire class Nodosariata. The class Textulariata is too little known during the Permian to play a significant biostratigraphical role: nevertheless, the appearance of the order Verneulinida is probably an important bioevent. The main genera among the lasiodiscids are Mesolasiodiscus , Lasiodiscus , Lasiotrochus , Asselodiscus , Pseudovidalina , Xingshandiscus and Altineria ; the bradyinoids Bradyina and Postendothyra ; the globivalvulinoids Globivalvulina , Septoglobivalvulina , Labioglobivalvulina , Paraglobivalvulina , Sengoerina , Dagmarita , Danielita , Louisettita , Paradagmarita , Paradagmaritopsis and Paremiratella ; the miliolates Rectogordius , Okimuraites , Neodiscus , Multidiscus , Hemigordiopsis , Lysites , Shanita and Glomomidiellopsis , and the tubiphytids and ellesmerellids, which might be specialized miliolate and cyanobacterium consortia, with reference to microstructures and phylogenies of these groups. The Nodosariata markers belong to Nodosinelloides , Tezaquina , Polarisella , Geinitzina , Pachyphloia , Rectoglandulina , first true Nodosaria , Langella , Pseudolangella , Calvezina , Cryptoseptida , Cylindrocolaniella , Colaniella , Frondina and Ichthyofrondina , but their lineages are too poorly understood to permit an accurate biostratigraphic use at the present time. The superfamily Geinitzinoidea is emended. Finally, palaeobiogeographical implications based on Shanita , Colaniella and Altineria are given.
FORAMINIFERA, STRATIGRAPHY, AND PALEOECOLOGY OF THE AQUIA FORMATION OF MARYLAND AND VIRGINIA Available to Purchase
ABSTRACT Twenty-two species of planktonic Foraminifera and 89 species of benthonic Foraminifera are recognized in the Aquia Formation. The following 10 species are new: Lagenammina pseudodifflugiformis, Haplophragmoides aquiensis, Rectoglandulina aquiensis, Oolina virginiana, Nonionella aquiensis, Aeolostreptis marylandica, Buliminella marylandica, Fissurina aquiensis, Fissurina marylandica , and Fursenkoina aquiensis . The Aquia Formation contains three planktonic foraminiferal assemblage zones that are useful in correlating outcrop sections within the Aquia and in correlating the Aquia with equivalent units in the Atlantic and Gulf Coastal Plains. The early Paleocene Globigerinoides daubjergensis - Globorotalia compressa Assemblage Zone occurs in the basal part of the Aquia. The Globorotalia pseudobulloides Assemblage Zone of late Paleocene age is present in the middle portion of the Aquia. The Globigerina spiralis - Globorotalia acuta Assemblage Zone, early Eocene in age, is found in the upper fossiliferous section of the Aquia. The Globorotalia pseudobulloides and Globigerina spiralis - Globorotalia acuta zones are elevated to zone rank from subzones since they are distinctive and stratigraphically valid. Paleoecologic analyses indicate that the underlying Brightseat Formation, the Aquia Formation, and the basal clay member of the overlying Nanjemoy Formation were deposited in a gradually shoaling sea. The Bright-seat was deposited in water not exceeding 300 feet in depth, the Aquia in progressively shallower water, and the clay member in shallow brackish water. In highly glauconitic parts of the Aquia the foraminiferal fauna is characterized by a high foraminiferal number, dominance of one species— Anomalinoides umboniferus, low numbers of benthonic species, and a high percentage of planktonic specimens. These facts suggest that the environmental factors important in the formation of glauconite (rate of sedimentation and oxygen content) affected the composition of the foraminiferal fauna.