A recently published paper in the Canadian Journal of Earth Sciences by Koch et al. (2022) presents valuable analytical data for samples of Ordovician–Silurian rocks in the Fire Bay area of northern Ellesmere Island. Based on these data, Koch et al. propose two changes to the geology of the Fire Bay area that are the subject of the commentary herein: revisions to the Ordovician–Silurian stratigraphy of the area and interpretation of a large fault (“Fire Bay Fault”). The geological framework of the Fire Bay area determined by Trettin (1998) is briefly reviewed below and then the proposed revisions of Koch...

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