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TitleStratigraphy of the Mount Clark, Mount Cap and Saline River formations in the Hornaday River canyon, Northwest Territories (NTS 97A)
AuthorBouchard, M L; Turner, E C
SourceGeological Survey of Canada, Open File 8180, 2017, 47 pages, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatpdf
ProvinceNorthwest Territories
AreaFranklin Mountains; Wrigley; Hornaday River
Lat/Long WENS-124.0000 -120.0000 69.0000 68.0000
Subjectsstratigraphy; paleontology; Lower Cambrian; Middle Cambrian; systematic stratigraphy; lithostratigraphy; depositional environment; paleotopography; bedrock geology; lithology; sedimentary rocks; arenites; dolostones; sandstones; mudstones; unconformities; sedimentary basins; sedimentary structures; textural analyses; stromatolites; fossils; trace fossils; Mount Clark Formation; Mount Cap Formation; Saline River Formation; Horton Plain; Coppermine Arch; Boot Inlet Formation; Franklin Mountain Formation; wackes; Phanerozoic; Paleozoic; Cambrian
Illustrationslocation maps; geological sketch maps; isopach maps; photographs; correlation sections; stratigraphic sections; rose diagrams
ProgramMackenzie Corridor, Shield to Selwyn, GEM2: Geo-mapping for Energy and Minerals
ProgramPolar Continental Shelf Program
Released2017 01 12
AbstractThis report documents the stratigraphic succession of Lower and Middle Cambrian formations in Hornaday River canyon, northeastern mainland Northwest Territories. Essentially flat-lying strata of the Mount Clark, Mount Cap, and Saline River formations were documented in overlapping sections along the Hornaday River to form a complete composite section. Both the lower, unconformable contact with the Neoproterozoic Boot Inlet Formation and the upper, conformable contact with the Cambro-Ordovician Franklin Mountain Formation are exposed in these sections. The Mount Clark Formation (approximately 78 m thick) consists of cross-bedded, bioturbated quartz arenite with local layers of wacke and was deposited in a high to moderate energy environment, initially over a karsted surface with at least 1-2 m of paleotopography. The Mount Cap Formation (approximately 34 m thick) consists of bioturbated and cross-bedded dolostone interbedded with glauconitic sandstone, deposited in a lagoonal environment. A sharp and possibly unconformable contact separates the Mount Cap Formation from the overlying Saline River Formation. The Saline River Formation (approximately 40 m thick) consists of sandy dolostone, dolomudstone, and mudstone that were deposited in an evaporitic environment. It contains no biogenic structures, but abundant desiccation cracks and halite moulds. Its upper contact with dolostone of the Franklin Mountains Formation is gradational (by interbedding) over 5 - 10 cm.
Summary(Plain Language Summary, not published)
This report documents the succession of rock units of Early and Middle Cambrian age that are exposed along Hornaday River in the northeast part of the mainland Northwest Territories. These rocks can be divided into (in ascending order), formal units called the Mount Clark Formation, Mount Cap Formation, and Saline River Formation. The rock types contained in each formation are described. Mount Clark Formation is mainly sandstone, Mount Cap Formation is dominated by carbonate rocks, and Saline River Formatio is dominated by shale, with some evidence of having been laid down in an extremely salt-rich marine basin. The regional correlation of these formations across the mainland Northwest Territories is discussed.