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Abstracts 9. Possible Paleosols or Exposed Sediments, Carboniferous Kiskatinaw Formation (Stoddart Group), Alberta and British Columbia
Variegated, homogenized, sandy mudstones exhibiting massive and brecciated textures occur in lower parts of the marginal marine and deltaic Kiskatinaw Formation. The lithologies, textures and vertical profiles suggest that these and other beds, are paleosols. The interpretation proposed is that the sediment was exposed after a splay flood event in an interdistributary bay fill or deltaic lake setting.
The paleosols are characterized by nodules, roots, slickensides, rare burrows, desiccation cracks, pisolites, chert bands, and waxy textures. The presence of vertical fractures, variegated colours (red, green, yellow), colour banding and mottling, rimmed concretions, finely laminated micritic and clayey crusts, and calcareous and hematitic cements suggest that the original sediment was leached and oxidized. Sedimentary structures are rare but do occur as relict features below the massive zones. Black carbonaceous fragments and films, often slickensided, are common. Massive units including vertical root like structures occur below coal stringers.
Acknowledgments and Associated Footnotes
1 Institute of Sedimentary and Petroleum Geology, Calgary
2 Lakehead University, Thunder Bay, Ontario
Copyright © 2010 by the Canadian Society of Petroleum Geologists
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