GEOSCAN, résultats de la recherche


TitreNew paleoenvironmentally important species of agglutinated foraminifera from the Oligocene and Miocene of the Beaufort Sea, Arctic Canada
AuteurSchröder-Adams, C J; McNeil, D H
SourceJournal of Foraminiferal Research vol. 24, no. 3, 1994 p. 178-190,
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 30093
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceRégion extracotière du nord; Yukon; Territoires du Nord-Ouest
SNRC107G; 107H
Lat/Long OENS-137.0000 -133.0000 71.0000 69.0000
Sujetsbiostratigraphie; talus continental; plate-forme continentale; glacis continental; distribution stratigraphique des fossiles; distribution de fossiles; assemblages fossiles; morphologie des fossiles; stratigraphie; sédimentologie
Illustrationslocation maps; tables; fossil charts; photomicrographs; schematic cross-sections
ProgrammeCRSNG Conseil de recherches en sciences naturelles et en génie du Canada
Résumé(disponible en anglais seulement)
Six new species of agglutinated foraminifera have been identified from Oligocene to Miocene sequences in the Beaufort-Mackenzie Basin of Arctic Canada. They are Psamminopelta arca n. sp., Labrospira turbida n. sp., Recurvoides brideauxi n. sp., Recurvoides torquis n. sp., Reticulophragmium projectus n. sp., and Gravellina indistincta n. sp. The new taxa have discrete distributions in continental
shelf, slope, and rise facies and are particularly useful in discriminating deltaic and deeper water facies. Labrospira turbida n. sp. is diagnostic of the delta- front facies in the Oligocene Kugmallit sequence. Recurvoides torquis n. sp. is characteristic of mid-basin prodeltal
shelf facies in the Kugmallit and Mackenzie Bay sequences. Reticulophragmium projectus is a deep-water indicator occurring in the Kugmallit and lowermost Mackenzie Bay sequences. Gravellina indistincta occurs in the prodelta/muddy shelf facies and also in deep-basin facies. Recurvoides brideauxi is characteristic of the deep-water continental slope facies, occurring in the Kugmallit, Mackenzie Bay and late Miocene Akpak sequences. Psamminopelta arca n. sp. is typically rare in lower slope to continental rise facies of the Kugmallit
and Mackenzie Bay sequences. Labrospira turbida and Reticulophragmium projectus show morphological adaptations to their contrasting habitats. Both show strengthened tests-L. turbida by thickened sutures and a lenticular shape; R. projectus by
a thick alveolar wall, rotund shape, sinuous sutures, and a ridge on the apertural face.