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The AAPG/Datapages Combined Publications Database
CSPG Special Publications
Abstract
Symposium Abstracts
Subsurface Facies of the Glauconitic Sandstone, Mannville Group, Southern Alberta: Abstract
Abstract
The Glauconitic Sandstone, a well
defined stratigraphic unit in the Mannville Group of Southern Alberta (Townships 1 to 45, Ranges 1 to 20W4), shows three distinct facies on the basis of gamma ray
log
signature and litho-logic sequences exhibited in cores and cuttings.
Facies 1 is defined by a ‘blocky’ gamma ray pattern and a typical ‘fining-upward’ channel sequence
, beginning with a crossbedded sandstone and ending in most cases with a thin coal seam. Facies 2 is a typical ‘coarsening-upward’, offshore bar
sequence
with characteristic gamma ray pattern. Environments indicated by sedimentary structures and trace fossils in the
sequence
, change from offshore at the base to foreshore at the top. Facies 3 shows a ‘coarsening-upward/fining-upward’ gamma ray pattern with minor indentations. Bioturbated mudstones at the base of the
sequence
coarsen upward to a zone of gravels, interbedded with fine sandstones; the latter containing possible hummocky cross-stratification. The
sequence
becomes finer again towards the top, leading to mudstone and coal. Sedimentation seems to have started below storm-wave base and ended up in a coastal swamp.
Acknowledgments and Associated Footnotes
1 Institute of Sedimentary and Petroleum Geology, 3303 - 33rd Street N.W., Calgary, Alberta T2L 2A7
Copyright © 2009 by the Canadian Society of Petroleum Geologists