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Devonian (c. 388-375 Ma) Horn River Group of Mackenzie Platform (NW Canada) is an open-shelf succession recording oceanic anoxic
events; Kabanov, P. Journal of the Geological Society vol. 176, 2018 p. 29-45,
https://doi.org/10.1144/jgs2018-075 (NRCan Cont.# 20180027)