Pg. 620, 623, 625. Deep Lake metaquartzite. Coarse to fine, massive to slabby metaquartzites, of grayish-white, dark-gray, light-gray, and brownish-gray colors, with a few beds of fine fluvial conglomerate and also scattered pebbles and clay balls; cross-bedding very regular; concealed beds probably schists. Thickness 2,000+ feet. Underlies Headquarters schist, probably conformably. Overlies gneissic complex, but contact not seen and relation unknown. Age is Precambrian. Assigned to early Algonkian.
Best exposed around Deep Lake and in the vicinity of Gold Hill, in T. 17 N., R. 79 W., Carbon Co., Medicine Bow Mountains, southeastern WY. Named from Deep Lake.

Source: US geologic names lexicon (USGS Bull. 896, p. 586); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).

Deep Lake Metaquartzite changed to Deep Lake Formation; several rock types present. Crops out mainly in central Medicine Bow Mountains, east part of mapped area, Ts16 to 19N, Rs78 to 80W, Albany and Carbon Cos, WY in the Northern Rocky Mountain region. Isolated outcrops (quartzite) can be mapped as far west as T17N, R82W. No well-exposed section found. Exceeds 12,000 ft thick near Phantom Lake in T16N, R80W where section consisting of quartzite, metabasalt, amphibolite, schist, and conglomerate measured. Partial section 5,000 ft thick measured at Gold Hill in secs 10 and 11, T16N, R80W where the formation is quartzite with pebbles of quartz and chert. Some quartzite beds are cross-bedded. Metaconglomerate found at two localities is the most distinctive rock type. Four types--coarse-grained, pebbly, feldspathic, and sericitic--of quartzite identified. Siliceous marble interbedded with quartzite present at four localities. In contact with hornblende gneiss and gneissic granite which are considered basement. Cross-bedding in quartzite indicates Deep Lake is younger than basement gneiss. Is older than Libby Creek Group (new). Of older Precambrian age.

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

Deep Lake Metaquartzite of Formation raised in stratigraphic rank to Deep Lake Group and divided into six newly named formations (ascending): Magnolia Formation, Lindsey Quartzite, Campbell Lake Formation, Cascade Quartzite, Vagner and Rock Knoll Formation. Overlies Phantom Lake Suite (new). Unconformably underlies Headquarters Formation of Libby Creek Group. Formations of the Deep Lake were deposited in three cycles. The first (Magnolia and Lindsey) is a fining-upwards fluvial cycle. The second (Campbell Lake and Cascade) is subaerial glacial? paraconglomerates and marine shales. The third began with glacial or glacio-marine deposition of paraconglomerates (Vagner) and continued with deposition of marine limestone and shale (Vagner) and shallow marine and fluvial deposits (Rock Knoll). The cycles may represent regional tectonic and climatic fluctuations. Cyclical deposition ended before Libby Creek laid down. Is 3.3 km thick. Mapped in the Medicine Bow Mountains of Carbon and Albany Cos, WY in the Northern Rocky Mountain region. Geologic map; stratigraphic charts. Early Proterozoic age.

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

Divided into six newly named formations: Magnolia Formation (at base), Lindsey Quartzite, Campbell Lake Formation, Cascade Quartzite, Vagner Formation, and Rock Knoll Formation at top. Is best exposed between Magnolia Lake and Lindsey Lake, Carbon Co, WY in Northern Rocky Mountain region. Is characterized by low-grade metasedimentary rocks, dominantly quartzite. Primary sedimentary features include cross-bedding, ripple marks, and channel scours. Is a sequence of Proterozoic age that overlies the Phantom Lake Metamorphic Suite and underlies Libby Creek Group. Stratigraphic diagrams. Geologic map.

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

Upper contact revised in that Rock Knoll Formation formerly included as the upper formation of the Deep Lake Group of the Snowy Pass Supergroup (first used) is removed from the Deep Lake and reassigned as the lowest formation (of 6) to the lower part of the Libby Creek Group of the Snowy Pass Supergroup. Rock Knoll is removed from the Deep Lake because it is in fault contact with the underlying Vagner Formation, upper formation of the Deep Lake and in depositional contact with the overlying Headquarters Formation of the lower part of the Libby Creek. Term Deep Lake used in the Medicine Bow Mountains of south-central WY in the Northern Rocky Mountain region. Divided into (ascending): Magnolia Formation, Lindsey Quartzite, Campbell Lake Formation, Cascade Quartzite, and Vagner Formation. Unconformably overlies Conical Peak Formation of Phantom Lake Metamorphic Suite. Of Proterozoic age. Geologic map. Stratigraphic chart.

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

Is a unit of fluvial origin used in the Medicine Bow Mountains, Carbon Co, WY in the Northern Rocky Mountain region. Is composed primarily of silici-clastic metasedimentary rocks (quartzite dominated) of fluvial origin that is assigned as the lower group of the Snowy Pass Supergroup (defined). Divided into five formations (ascending order): Magnolia Formation, Lindsey Quartzite, Campbell Lake Formation, Cascade Quartzite, and Vagner Formation. Unconformably overlies Conical Peak Quartzite (new) of Phantom Lake Metamorphic Suite (rank raised). Upper contact placed at base of (rather than top of as was done in earlier report) Rock Knoll Formation, a formation reassigned to the overlying Libby Creek Group. The upper contact is thought to be a thrust fault--the Reservoir Lake fault. Early Proterozoic age. Deposited between 2,450 and 2,100 m.y. Geologic map; exposed areal limit of formations in group shown; stratigraphic table.

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