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TitleSedimentology and ichnology of an Early-Middle Cambrian storm-influenced barred shoreface succession, Colville Hills, Northwest Territories
AuthorHerbers, D S; MacNaughton, R B; Timmer, E R; Gingras, M K
SourceBulletin of Canadian Petroleum Geology vol. 64, no. 4, 2016 p. 538-554,
Alt SeriesEarth Sciences Sector, Contribution Series 20160254
PublisherCanadian Society of Petroleum Geologists
Mediaon-line; digital; paper
File formatpdf; html
ProvinceNorthwest Territories
NTS96M; 96N; 96L; 96K
AreaColville Hills
Lat/Long WENS-127.0000 -123.0000 68.0000 64.0000
Subjectscores; drillholes; storms; storm deposits; stratification; lithology; ichnology; Hummocky cross-stratification (HCS); Mount Clark Formation
Illustrationslocation maps; stratigraphic columns; photographs; core logs; 3-D models; diagrams
ProgramMackenzie Corridor, Shield to Selwyn, GEM2: Geo-mapping for Energy and Minerals
Released2017 01 13
AbstractThis study presents the first detailed sedimentological and ichnological study of the Cambrian Mount Clark Formation from the Colville Hills region of the Northwest Territories, Canada. Based on analyses of four industry drill cores, eight lithofacies are identified that occur in a recurring facies association. This facies association records a progradational storm-influenced shoreface succession preserving offshore to upper shoreface sedimentary environments. Storm influence is indicated by the presence of hummocky cross-stratification (HCS) and of tempestite/fair-weather couplets consisting of low-angle cross-bedded sandstone with thin bioturbated interbeds. Marine flooding surfaces are expressed as pebbly transgressive lags that separate near-shore and overlying offshore sedimentary environments. Piperock is common, represents the most oil stained lithology, and is preserved within a wave-dominated shoreface succession. The sedimentological and ichnological character of this succession suggests that predictable shoreface stacking patterns and sandstone distributions characterize the Mount Clark Formation in the subsurface of the study region.
Summary(Plain Language Summary, not published)
The manuscript documents the sedimentary character of a thick package of sandstone buried beneath the Colville Hills, NWT. These rocks are called the Mount Clark Formation and were deposited between roughly 500 million and 540 million years ago. They preserved sedimentary structures and fossil burrows that together suggest that they were deposited in along the advancing shoreline of a shallow sea that was affected by fair-weather waves and storms. Mount Clark Formation is known to contain oil and gas reserves; the present study suggests that oil may be preferentially associated with sandstone beds characterized by a strongly developed fabric produced by numerous vertical burrows.