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Paleoenvironments and regional stratigraphic framework of the Middle-Upper Albian Lepine Formation in the Liard Basin, Northern Canada

2005; Canadian Society of Petroleum Geologists; Volume: 53; Issue: 1 Linguagem: Inglês

10.2113/53.1.25

2368-0261

David M.S. Jowett, Claudia J. Schröder-Adams,

Geological formations and processes

Research Article| March 01, 2005 Paleoenvironments and regional stratigraphic framework of the Middle–Upper Albian Lepine Formation in the Liard Basin, Northern Canada D.M.S. Jowett; D.M.S. Jowett Department of Earth Sciences, Carleton University, Ottawa, ON K1S 5B6, d.jowett@utoronto.ca Search for other works by this author on: GSW Google Scholar C.J. Schröder-Adams C.J. Schröder-Adams Chair of Earth Sciences, Department of Earth Sciences, Carleton University, Ottawa, ON K1S 5B6, csadams@css.carleton.ca Search for other works by this author on: GSW Google Scholar Author and Article Information D.M.S. Jowett Department of Earth Sciences, Carleton University, Ottawa, ON K1S 5B6, d.jowett@utoronto.ca C.J. Schröder-Adams Chair of Earth Sciences, Department of Earth Sciences, Carleton University, Ottawa, ON K1S 5B6, csadams@css.carleton.ca Publisher: Canadian Energy Geoscience Association Received: 08 Dec 2003 Accepted: 11 Jun 2004 First Online: 02 Mar 2017 Online ISSN: 2368-0261 Print ISSN: 0007-4802 © The Society of Canadian Petroleum Geologists Bulletin of Canadian Petroleum Geology (2005) 53 (1): 25–50. https://doi.org/10.2113/53.1.25 Article history Received: 08 Dec 2003 Accepted: 11 Jun 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation D.M.S. Jowett, C.J. Schröder-Adams; Paleoenvironments and regional stratigraphic framework of the Middle–Upper Albian Lepine Formation in the Liard Basin, Northern Canada. Bulletin of Canadian Petroleum Geology 2005;; 53 (1): 25–50. doi: https://doi.org/10.2113/53.1.25 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 The thick Middle to Late Albian Lepine Formation in the Liard Basin of northeastern British Columbia, southern Yukon and Northwest Territories preserves a continuous record of sedimentation during a time of multiple sea-level fluctuations that produced pronounced unconformities elsewhere in the Cretaceous Western Interior Seaway. Although sediment supply was high, the rapidly subsiding sub-basin produced sufficient accommodation to maintain offshore and shelf conditions throughout the interval. Using lithology, micropaleontology, well log correlations and Rock Eval pyrolysis, the 1000 m thick Lepine Formation is divided into five units in upper/lower offshore and shelf facies. The foraminiferal fauna differs substantially from that described from the Peace River Foothills and documents a continuous marine record during flooding of the Joli Fou Sea and the transition to the Mowry Sea. Regional well log correlations show significant thinning of the Lepine Formation southwards to the equivalent upper Buckinghorse and Hasler formations. Markers at transgressive surfaces can be traced for greater than 400 km along the foredeep. The thick, lower to middle part of the Lepine Formation (Units 1–3) contains foraminifera of the Ammobaculites wenonahae Zone and Ammomarginulina Assemblage Zone that record stressed oceanographic conditions related to periods of uplift west and northwest of the Liard Basin during the Joli Fou and lower Viking intervals. The transition between the two major inundations (Joli Fou and Mowry) is represented by a thick continuous interval in the Liard Basin. The Viking marker (lowermost Unit 3), traced in well logs and projected onto the outcrop section, has no obvious biostratigraphic definition. A major increase in foraminiferal diversity occurs near the base of the Bougie member (Unit 4), indicating more normal marine conditions within the Mowry Sea. A major flooding surface above the Bougie member is correlated with the 'Viking grits' (base of Unit 5) transgressive lag in the Peace River region of the Rocky Mountain Foothills. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.