Reply to the discussion by Hadlari on "age and significance of the fire bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada".

The article focuses on responding to Hadlari's interpretation of the Fire Bay area in northern Ellesmere Island, Canada, which differs from Koch et al.'s conclusions. Topics include the rationale for changing the stratigraphic nomenclature, the significance of the Fire Bay fault, and a clarification of U–Pb zircon data, challenging Hadlari's assumptions and supporting Koch et al.'s proposed revisions to the geological framework.