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TitleDistribution of "anomalously thick sandstone bodies" in the Middle Triassic of the Western Canada Sedimentary Basin
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorDixon, J
SourceGeological Survey of Canada, Open File 5120, 2006, 12 pages; 1 CD-ROM, (Open Access)
LinksMetadata - Métadonnées
PublisherNatural Resources Canada
Documentopen file
MediaCD-ROM; digital; on-line
RelatedThis publication is related to Dixon, J; (2004). Evidence for a major unconformity in Middle Triassic strata (Doig, Halfway and lowermost Charlie Lake formations) of the Grande Prairie area (Map-sheet 83 M; townships 70 to 80, ranges 1W6 to 13W6), west-central Alberta, Geological Survey of Canada, Open File 1580
File formatreadme
File formatgif; htm; jpg; pdf (Adobe Acrobat Reader); rtf
ProvinceAlberta; British Columbia
NTS83M; 93P; 94A
AreaFort St. John; Dawson Creek; Grande Prairie
Lat/Long WENS-122.0000 -118.0000 57.0000 55.0000
Subjectsstratigraphy; sedimentology; Middle Triassic; sedimentary rocks; sandstones; faults, normal; well locations; stratigraphic correlations; slump structures; gamma ray logging; sea level changes; transgressions; erosion; regressions; unconformities; sedimentary basins; shoreface deposits; muds; Western Canada Sedimentary Basin; Peace River Embayment; Beatton High; Halfway Formation; Doig Formation; Gwillim Thrust; Charlie Lake Formation; Montney Formation; siliciclastics; Phanerozoic; Mesozoic; Triassic
Illustrationssketch maps; stratigraphic charts; stratigraphic correlations; stratigraphic sections; block diagrams
Released2006 04 01
AbstractIsolated, thick sandstone bodies in the Middle Triassic Doig Formation have been termed "anomalously thick sandstone bodies" (ATSBs) and are present in west-central Alberta and northeast British Columbia. They occur at several stratigraphic levels within the Doig Formation, over a limited geographic area. The ATSBs tend to become younger to the west and southwest, reflecting the direction of progradation for Middle Triassic sediments. Their distribution closely parallels the Peace River Embayment, a basin-scale depression that originated in the Carboniferous and continued to subside during the Triassic.
The ATSBs formed in translational and rotational slumps on muddy prograding siliciclastic sediment lenses during periods of relative sea-level fall. Lower and middle shoreface deposits filled in these slumps during base-level fall and were subsequently capped by a thin layer of transgressive sandstone when sea-level began to rise.

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