GEOSCAN Search Results: Fastlink

GEOSCAN Menu


TitleIntroducing Pulcheripollenites sweetii in honour of the late Dr. A.R. Sweet, as part of a revised stratophenetic framework for Pulcheripollenites spp.
AuthorBell, K M
SourceThe 51st Annual Meeting of AASP-The Palynological Society and Annual General Meeting of the Canadian Association of Palynologists (CAP), programs and abstracts; 2018 p. 9
Year2018
Alt SeriesNatural Resources Canada, Contribution Series 20180259
MeetingThe 51st Annual Meeting of AASP-The Palynological Society and Annual General Meeting of the Canadian Association of Palynologists (CAP); Calgary, AB; CA; August 5-10, 2018
Documentbook
Lang.English
Mediapaper; on-line; digital
File formatpdf
Subjectspaleontology; stratigraphy; systematic paleontology; taxonomy; evolution; fossils; biostratigraphy; fossil morphology; Upper Cretaceous; Campanian; Maastrichtian; Pulcheripollenites sweetii; Pulcheripollenites spp.; Horseshoe Canyon Formation; Dr. A.R. Sweet; stratophenetics; Phanerozoic; Mesozoic; Cretaceous
ProgramMackenzie Corridor, Shield to Selwyn, GEM2: Geo-mapping for Energy and Minerals
Released2018 08 01
AbstractWhen the genus Pulcheripollenites was first designated, three species attributed to this genus (P. inrasus, P. krempii and P. narcissus) were described from the lower part of the Horseshoe Canyon (formerly Edmonton) Formation of central Alberta (Srivastava, 1969). This genus was not recognized as having significant biostratigraphic value as all holotypes came from a single sample now considered to be of late Campanian age. Subsequent studies of Campanian and Maastrichtian strata from west-central Alberta, east-central Yukon Territory and west-central Northwest Territories reveals that the described species of Pulcheripollenites have distinct biostratigraphic ranges. The re-description of three existing species (P. inrasus, P. krempii and P. narcissus), the generic reassignment of a single species (P. pseudomagnificus), and the description of a new species (P. sweetii), along with the documentation of these five species over an extended stratigraphic interval, allows the recognition of biostratigraphic and stratophenetic trends within the Pulcheripollenites complex of species.
The upper age range of Pulcheripollenites has been established as being late Maastrichtian, with P. sweetii and P. pseudomagnificus both associated with assemblage 9 and P. sweetii also associated with assemblage 10 of Nichols and Sweet (1993). The lower age range of Pulcheripollenites in northern Canada is late Campanian with P. narcissus found in association with assemblage 6 taxa (Nichols and Sweet, 1993). Observed through the late Campanian and Maastrichtian are changes: 1) in the polar outline from sub-triangular, to rounded-triangular, to sub-circular; 2) in the equatorial outline from oblate to sub-circular; 3) in the aperture style from brevicolpate, to elongate and then equidimensional pores; 4) in the compound ectexinal sculpture from dominantly striate with prominent lirae and reduced interlirae muri to a more fine and even reticulation; 5) from a tectate margo bordering the colpi to an entirely intectate ectexine; 6) from a footlayer of approximately uniform thickness to one thickening towards and sometimes protruding at the aperture and; 7) in pollen grain diameter, with reduction in size through time. The recognition of these trends within Pulcheripollenites enhances the biostratigraphic utility of this genus in the upper Campanian and Maastrichtian of North America.
Summary(Plain Language Summary, not published)
The biostratigraphic value for species of pollen belonging to the genus Pulcheripollenites was previously unrecognized. The re-description of existing species and description of a new species, along with their documentation over an extended stratigraphic interval from Yukon and west-central Northwest Territories, reveals trends that enhance the utility of this genus for Late Cretaceous biostratigraphic correlation.
GEOSCAN ID312993