First published use of name for a formation (1 of 7) in the Deep Lake Group in the Sierra Madre, Carbon Co, WY in the Northern Rocky Mountain region. Shown on several tables but no detailed description, discussion of source of name, nor designation of type included. Assigned to the Early Proterozoic. Overlies Magnolia Formation, basal formation of Deep Lake. Underlies Campbell Lake Formation of Deep Lake. Consists of thick green and silver phyllite and thin phyllitic quartzites with rare pebbly layers. Thickness not stated. Of marine origin.

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

Named as one of six formations of the Snowy Pass Group (defined) in the Sierra Madre, Carbon Co, WY, in the Northern Rocky Mountain region. Type area designated for lower part is in SE1/4 sec 4, NE1/4 sec 9, T14N, R87W. Type area for upper part is in E1/2 sec 8, T14N, R87W. Named for Singer Peak. As used in this report, Singer Peak includes Singer Peak of Graff (1979, fig 2) and the overlying Campbell Lake Formation of Graff (1979, fig 2). Term Campbell Lake cannot be recognized with certainty in the Sierra Madre. Lower part consists of thick silver-colored phyllites with red garnet, buff to orange, medium-grained quartzite, thick green and thin blue phyllite, and some lenses of graywacke. The upper part is discontinuous and consists of poorly sorted paraconglomerate of angular granite clasts in a green to black phyllitic matrix, thin quartzite and thin green phyllite. Formation is approximately as much as 831 m thick; thins eastward; exact thickness uncertain because of folding and poor exposure. Interfingers with underlying Magnolia Formation of Snowy Pass. Contact with overlying Cascade Quartzite of Snowy Pass is poorly exposed and probably an unconformity. Correlated with Lindsey Quartzite and Campbell Lake Formation of Medicine Bow Mountains. May be an offshore facies of Medicine Bow. Early Proterozoic age. Geologic map. Stratigraphic tables.

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