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Publisher-reported update

2026-08-26

The Carpenter Creek area straddles the Paleozoic basin-platform transition which is coincident with the Dawson thrust in north-central Yukon. North of the thrust, the strata can be broadly divided into two groups: (1) Proterozoic sedimentary and intrusive rocks, and (2) Paleozoic platformal strata with volcanic rock horizons. The two groups of rocks are separated by an angular unconformity. Below the unconformity, Hart River gabbro sills and dikes (ca. 1.38 Ga) intrude the Gillespie Lake Group. Younger Proterozoic rocks that are not intruded by the gabbro occur on the other side of a fault that traces through the Carpenter Creek valley. These rocks are interpreted to be younger than Gillespie Lake Group and are tentatively assigned to Pinguicula Group. Above the unconformity, Paleozoic volcanic and volcaniclastic rocks are interstratified with carbonate rocks. The volcanic rocks occur near the base and top of the Bouvette Formation. South of the Dawson thrust, in its direct hangingwall, volcanic and volcaniclastic rocks are interlayered with shale, chert and sandstone and intruded by discontinuous gabbro bodies of unknown age. Rare limestone lenses within the volcanic rocks…

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