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Revised stratigraphy, regional correlations and new bentonite radiometric ages for the Albian Loon River Formation, Fort St. John Group, northwestern Alberta

2013; Canadian Society of Petroleum Geologists; Volume: 61; Issue: 4 Linguagem: Inglês

10.2113/gscpgbull.61.4.331

2368-0261

B. Hathway, Graham Dolby, D H McNeil, Sandra L. Kamo, Matthew T. Heizler, Nancy Joyce,

Geological and Geochemical Analysis

Research Article| December 01, 2013 Revised stratigraphy, regional correlations and new bentonite radiometric ages for the Albian Loon River Formation, Fort St. John Group, northwestern Alberta B. Hathway; B. Hathway Alberta Geological Survey Alberta Energy Regulator 402 Twin Atria Building 4999 – 98th Avenue Edmonton, AB, Canada T6B 2X3 Search for other works by this author on: GSW Google Scholar G. Dolby; G. Dolby G. Dolby and Associates 6719 Leaside Drive S.W. Calgary, AB, Canada T3E 6H6 Search for other works by this author on: GSW Google Scholar D.H. McNeil; D.H. McNeil Geological Survey of Canada 3303 – 33rd Street NW Calgary, AB, Canada T2L 2A7 Search for other works by this author on: GSW Google Scholar S.L. Kamo; S.L. Kamo Jack Satterly Geochronology Laboratory Department of Earth Sciences University of Toronto 22 Russell Street Toronto, ON, Canada M5S 3B1 Search for other works by this author on: GSW Google Scholar M.T. Heizler; M.T. Heizler New Mexico Bureau of Geology and Mineral Resources Socorro, NM, USA 87801 Search for other works by this author on: GSW Google Scholar N. Joyce N. Joyce Geological Survey of Canada 601 Booth Street Ottawa, ON, Canada K1A 0E8 Search for other works by this author on: GSW Google Scholar Bulletin of Canadian Petroleum Geology (2013) 61 (4): 331–358. https://doi.org/10.2113/gscpgbull.61.4.331 Article history received: 23 Jul 2013 accepted: 02 Nov 2013 first online: 13 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation B. Hathway, G. Dolby, D.H. McNeil, S.L. Kamo, M.T. Heizler, N. Joyce; Revised stratigraphy, regional correlations and new bentonite radiometric ages for the Albian Loon River Formation, Fort St. John Group, northwestern Alberta. Bulletin of Canadian Petroleum Geology 2013;; 61 (4): 331–358. doi: https://doi.org/10.2113/gscpgbull.61.4.331 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of Canadian Petroleum Geology Search Advanced Search Abstract Although the mudstone-dominated Loon River Formation of northwestern Alberta has clear value as a mappable lithostratigraphic unit, its limits have previously not been well defined. The formation definition is here brought into line with the North American Stratigraphic Code with the delineation of upper, lower and lateral boundaries, and the definition of a composite type section with its lower part in the cored well 00/14-18-123-19W5M/0, and an upper part consisting of outcrop sections along the Boyer and Ponton rivers.Wireline-log, core and outcrop correlations indicate that regional transgressive/flooding surfaces TS1 and TS11, which respectively mark the base of the Spirit River Formation and top of the Peace River Formation in the Peace River area, mark the base and top of the Loon River Formation farther north. Transgressive/flooding surface TS9, at the top of the Spirit River Formation in the south, can be traced northward as an allostratigraphic surface to subdivide the Loon River Formation into lower and upper intervals.The Spirit River and laterally equivalent lower Loon River interval form a northward prograding and thinning clastic wedge. New biostratigraphic data and correlation with the Spirit River Formation indicate that the lower Loon River Formation is of Early to Middle Albian age. In contrast, the Peace River–upper Loon River interval is thicker to the north. Initial mapping of discontinuities within the upper Loon River Formation indicates that it may consist of a series of northward offlapping sedimentary wedges. New U–Pb and 40Ar/39Ar ages for two bentonite beds, age-diagnostic dinocysts, and foraminifera of the Haplophragmoides multiplum Subzone indicate a Middle Albian age for the basal part of the upper Loon River Formation and confirm wireline-log correlation with the basal Harmon Member of the Peace River Formation to the south. The age of the uppermost part of the upper Loon River Formation is less certain. Foraminifera indicative of the Late Albian Miliammina manitobensis Zone and Late Albian dinocysts in samples from the overlying Shaftesbury Formation provide an upper age limit, and these strata may be as young as Upper Albian. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.