Pinard, S.; Mamet, B. (1998). Taxonomie des petits foraminifères du Carbonifère supérieur-Permien inférieur du bassin de Sverdrup, Arctique canadien. Palaeontographica Canadiana. 15: 1-253.

333336

Pinard, S.; Mamet, B.

1998

15: 1-253

Publication

Available for editors  

The foraminiferal stratigraphy of the Late Carboniferous-Early Permian is commonly based on fusulines that provide a reliable zonal framework. Up to now, geologists have neglected smaller foraminifers although they have some biostratigraphic value, as this study will demonstrate. This work is concentrated on the Late Paleozoic pericratonic Sverdrup Basin in the Canadian Arctic. The basin, 1300 km long and 400 km wide, is characterized by a cyclic sedimentation and numerous environments that are observed from the margin to the depocenter. More than forty stratigraphic sections have been studied, ranging from the Bashkirian to the Sakmarian (Antoinette, Belcher Channel, Canyon Fiord, Hare Fiord, Otto Fiord, Mount Bayley and Nansen formations). The rocks consist of carbonates, evaporites and elastics. The data of a few Sakmarian-Artinskian, Artinskian and post-Artinskian («Wordian?») samples that belong to the Raanes, Trappers Cove, Great Bear Cape and Degerböls formations are included. More than 4000 thin-sections have been examined and 170 taxa that belong to 58 genera are present. Most of the taxa have been previously recorded in North America or Eurasia, but a few are new. Hence we describe 17 new species (Amphoratheca robusta, Bradyina? arctica, Climacammina cummingsi, Endothyra? bamberi, Globivalvulina nassichucki, Neohemigordius beauchampi, N. sverdrupensis, Pseudopalaeospiroplectammina kerri, Pseudovidalina minor, P. multihelicis, P. pararecta, P. permiensis, Syzranella higginsi, S. ozadetzi, Syzrania embryi, S. raanesensis, Tetrataxis gigantea). Twelve (maybe 13) biostratigraphic assemblages are recognized that reasonably characterize the Bashkirian-Sakmarian succession. The faunal assemblages of the Upper Carboniferous and lowermost Permian are often missing at the margin of the basin. Three mediocre but characteristic faunas were observed in the Sakmarian-Artinskian, Artinskian and post-Artinskian («Wordian?») rocks. Paleoclimatic and paleogeographic implications are hard to assess due to the lack of comparison material. The Bashkirian fauna contain a mixture of Tethyan and North American taxa (Janischewskina versus Zellerinella). The diversity and abundance of Permian taxa are quite low.

RIS (EndNote, Reference Manager, ProCite, RefWorks)
BibTex (BibDesk, LaTeX)

[Back to search]