Carney Lake Complex of Treves (1960) is revised as Carney Lake Gneiss. Type area designated as eastern half of T40N, R29W [in Dickinson Co., northwestern MI]. Consists of 85 percent granitic gneiss; remainder is granodiorite and syenite dikes. Gneiss is not uniform in appearance, but varies from gray plagioclase-biotite gneiss to red microcline-biotite gneiss. Contains 10 percent inclusions of amphibolite, biotite schist, and metasedimentary rocks. Rocks are overlain by middle Precambrian Sturgeon Quartzite (early Animikie age) to the south and west; to the north, the rocks are in fault contact with middle Precambrian (late Animikie) Michigamme Slate. Age is early Precambrian based on stratigraphic position and radioisotope dates ranging from 2,590 to 1,240 on several minerals (biotite, microcline, zircon); age is estimated as 2,700 m.y. as reported by Davis and others (1960).

Source: GNU records (USGS DDS-6; Reston GNULEX).

Is the southernmost exposed Archean unit in MI's Upper Peninsula, Dickinson Co, Lake Superior region. Strongly deformed and cataclastic gneissic rocks consisting of mostly granitic gneiss with minor interlayered hornblende-biotite gneiss and biotite-rich gneiss. Correlation chart. Is assigned a Late Archean age.

Source: GNU records (USGS DDS-6; Denver GNULEX).