Trace-fossil assemblages in the Lower Triassic Toad Formation, La Biche River map area, southeastern Yukon

Research Article| June 01, 2010 Trace-fossil assemblages in the Lower Triassic Toad Formation, La Biche River map area, southeastern Yukon Robert B. MacNaughton; Robert B. MacNaughton Geological Survey of Canada (Calgary), Natural Resources Canada, 3303–33 Street NW Calgary, AB T2L 2A7 Search for other works by this author on: GSW Google Scholar John-Paul Zonneveld John-Paul Zonneveld Geological Survey of Canada (Calgary), Natural Resources Canada, 3303–33 Street NW Calgary, AB T2L 2A7 1Current address: Department of Earth and Atmospheric Sciences, 1–26 Earth Sciences Building, University of Alberta, Edmonton, AB, Canada T6G 2E3 Search for other works by this author on: GSW Google Scholar Author and Article Information Robert B. MacNaughton Geological Survey of Canada (Calgary), Natural Resources Canada, 3303–33 Street NW Calgary, AB T2L 2A7 John-Paul Zonneveld 1Current address: Department of Earth and Atmospheric Sciences, 1–26 Earth Sciences Building, University of Alberta, Edmonton, AB, Canada T6G 2E3 Geological Survey of Canada (Calgary), Natural Resources Canada, 3303–33 Street NW Calgary, AB T2L 2A7 Publisher: Canadian Society of Petroleum Geologists Received: 21 Jan 2010 First Online: 02 Mar 2017 Online ISSN: 2368-0261 Print ISSN: 0007-4802 © The Society of Canadian Petroleum Geologists Bulletin of Canadian Petroleum Geology (2010) 58 (2): 100–114. https://doi.org/10.2113/gscpgbull.58.2.100 Article history Received: 21 Jan 2010 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Robert B. MacNaughton, John-Paul Zonneveld; Trace-fossil assemblages in the Lower Triassic Toad Formation, La Biche River map area, southeastern Yukon. Bulletin of Canadian Petroleum Geology 2010;; 58 (2): 100–114. doi: https://doi.org/10.2113/gscpgbull.58.2.100 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 Two outcrop sections of the Lower Triassic (Griesbachian = Early Induan) Toad Formation in southeastern Yukon (La Biche River map area; NTS 95 C) contain well-preserved trace fossils. Strata consist of interbedded shale, siltstone, and sandstone in varying proportions and are interpreted to record deposition on a wave-dominated shelf. Trace-fossil diversity and abundance are low in facies interpreted to be of distal-shelf origin but are moderate to high in offshore-transition and lower-shoreface strata. Sandstone packages interpreted as shoreface deposits are effectively barren. The most common ichnofossils are dwelling networks (Spongeliomorpha), infaunal feeding traces (most commonly Planolites), and arthropod-produced furrowing traces (Cruziana). Ichnotaxonomic diversity of the Toad Formation is high relative to many well-documented Griesbachian successions. This supports suggestions that infauna recovered more rapidly in high-paleolatitude regions than in low-paleolatitude regions following the end-Permian extinction. The studied strata are an outcrop analogue for correlative, gas-producing strata (Montney Formation) in the Ring/Border Field of northeastern British Columbia and the Pedigree Field of northwestern Alberta. Similarities in sedimentology and ichnology between the two successions suggest that prospective reservoir strata may be present regionally in the Lower Triassic. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.