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GSA Special Papers
Paleoenvironmental and Tectonic Controls in Coal-Forming Basins in the United States
Author(s)
Geological Society of America

Volume
210
Copyright:
© 1986 Geological Society of America
Geological Society of America
ISBN print:
9780813722108
Publication date:
January 01, 1986
Book Chapter
Styles of coal deposition in Tertiary alluvial deposits, Powder River Basin, Montana and Wyoming
Author(s)
-
Published:January 01, 1986
A detailed comparison of styles of coal deposition of Tertiary rocks in the Powder River Basin shows that stratigraphic variations, areal distributions, and trends of depositional facies are the results of variations in alluvial settings. Styles of coal deposition are examined in coal-zone intervals, which are treated either as individual or multiple depositional packages. Facies stratigraphic variations display a common interrelationship of channel-levee facies bounded by floodplain and backswamp facies. Anomalously thick, minable coal deposits commonly are split into discrete coal beds separated by complexes of channel-levee facies. The areal distribution of channel deposits and laterally juxtaposed minable coal deposits...
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Index Terms/Descriptors
- alluvial fans
- alluvial plains
- Cenozoic
- clastic rocks
- coal
- coal seams
- controls
- deposition
- fluvial features
- Fort Union Formation
- Great Plains
- lithofacies
- Montana
- North America
- organic residues
- Paleocene
- paleoenvironment
- Paleogene
- Powder River basin
- sedimentary rocks
- sedimentation
- stratigraphy
- structural controls
- Tertiary
- thickness
- Tongue River Member
- United States
- Wasatch Formation
- Wyoming
Latitude & Longitude
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