Leslie, Andrew , Pfefferkorn, Hermann , Nassichuk, Walter , Utting, John .
Paleoenvironments of plant fossils from the Emma Fiord Formation (Visťan, Mississippian) of the Canadian Arctic Archipelago.
VISťAN floras from the Emma Fiord Formation at three localities in the Canadian Arctic Archipelago fill a gap in the knowledge of the regional distribution of floras of this age. The floras occur in two lithologies, limestone and organic - rich black shale, representing different facies of fluvio-lacustrine settings. The rivers and lakes that deposited these sediments existed in half-grabens in an area that underwent rifting well in advance of the beginning of widespread sedimentation in the Sverdrup Basin. Marginal lacustrine carbonate facies are dominated by the lycopsids Lepidodendron volkmannianum and Lepidophloios sp. Clastic lacustrine and fluviatile facies are dominated by pteridosperms and fragmentary lycopsids. The different facies also influenced the palynofloras, with those from lacustrine deposits varying from diverse to depauperate, while palynofloras from the fluviatile facies were uniformly depauperate. The macrofloras and palynofloras are comparable to those found in similar tectonic and sedimentary settings in Alaska, Greenland, and Spitsbergen. These floras are distinctly divided by lithologies into an in situ lycopsid dominated assemblage in the carbonate facies and an allochthonous assemblage of fragmentary pteridosperms and lycopsids in the clastic facies.
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1 - University of Chicago, Department of Geophysical Sciences, 5734 S. Ellis Avenue, Chicago, Illinois, 60637, USA
2 - University of Pennsylvania, Department of Earth and Environmental Sciences, 240 South 33rd Street, Philadelphia, Pennsylvania, 19104, USA
3 - Geological Survey of Canada, Natural Resources Canada, 3303 - 33 Street North West, 1st Floor, Room. 115, Calgary, Alberta, T2L 2A7, Canada
4 - Geological Survey of Canada, Natural Resources Canada, 3303 - 33 Street North West, Room. 2206, Calgary, Alberta, T2L 2A7, Canada
Presentation Type: Oral Paper:Papers for Sections
Date: Monday, July 31st, 2006
Time: 10:30 AM