Revised stratigraphy of the Hazelton Group in the Iskut River region, northwestern British Columbia JoAnne Nelson1, a, John Waldron2, Bram van Straaten1, Alex Zagorevski3, and Chris Rees4 1 British Columbia Geological Survey, Ministry of Energy, Mines and Petroleum Resources, Victoria, BC, V8W 9N3 2 Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, T6G 2E3 3 Geological Survey of Canada, Ottawa, ON, K1A 0E8 4 Imperial Metals Corporation, Vancouver, BC, V6C 3B6 a corresponding author:
[email protected] Recommended citation: Nelson, J., Waldron, J., van Straaten, B., Zagorevski, A., and Rees, C., 2018. Revised stratigraphy of the Hazelton Group in the Iskut River region, northwestern British Columbia. In: Geological Fieldwork 2017, British Columbia Ministry of Energy, Mines and Petroleum Resources, British Columbia Geological Survey Paper 2018-1, pp. 15-38. Abstract The Iskut River region hosts many signifi cant porphyry, precious-metal vein and volcanogenic massive sulphide deposits. Most of these deposits are related to the Hazelton Group (latest Triassic to Middle Jurassic) and affi liated intrusions. Current knowledge of the Hazelton Group is the outcome of piecemeal, local mapping contributions over many years by different workers at different scales, resulting in inconsistencies and errors in stratigraphic nomenclature. Given that exploration interest in the region remains high, and that considerable work has recently been done in the region, a reappraisal of this nomenclature, applying provisions in the North American Stratigraphic Code is required. In our new stratigraphic framework, newly recognized units are given local geographic names; others are correlated with previously established units. Two newly defi ned lowermost Hazelton units, the Klastline formation (new informal name) and the Snippaker unit, are latest Triassic, showing that earliest Hazelton volcanism and sedimentation were coeval with formation of the Red Chris porphyry deposit.