...Donald R. Lamb; Robert B. Johnson Abstract Natural percussion cones are found on cobbles and boulders of quartzite of the Medicine Peak Quartzite (Precambrian) in Wyoming. Similar cones have been duplicated in the laboratory on cobbles of Medicine Peak Quartzite and on pieces of plate...

... and are characterized by pronounced "knob-and-kettle" topography and tills rich in crystalline constituents. More recent deposits at the base of Medicine Bow Peak, W. of the source of Libby Creek, have been considered by some workers as recent moraines, but are more likely protalus ramparts overlying latest Pinedale...

... ( Houston et al. 1992 ). The Bridger Peak quartzite is correlated with the Conical Peak quartzite of the Medicine Bow Mountains (Fig.  3 ), which is interpreted to be deposited in a fluvial to shallow-marine environment ( Houston et al. 1992 ). The Phantom Lake suite, Vulcan Mountain metavolcanics...

...Brainerd Mears Abstract Periglacial polygons, 100 ft. above timberline, are restricted to soil in an alpine meadow on a diorite dike which cuts massive quartzite weathering to felsenmeer. The nets appear inactive because of lichen-covered surface blocks, a distinctive "A" soil horizon, deeply...

... in the Medicine Bow Mountains of southeastern Wyoming. These shear zones are generally interpreted as a mid-crustal thrust system rotated to its present-day subvertical orientation during late-stage, orogen-scale folding. However, the map geometry, presence of large domains of S tectonites, and vertical mineral...

...John L. Severson ABSTRACT A southeastward-plunging synclinal mountain ridge, capped by Mississippian rocks, rises from a base of Cambrian rocks in the Sunwapta Pass area. Detailed sections involving Silurian and Devonian rocks were studied from the Nigel Peak area on the north southward...

..., and deformation mechanism analyses of the northern mylonite zone of the eastern Medicine Bow Mountains. Mylonites of this zone record a complex deformation history, but the main deformation phase was sinistral/northwest-side-up oblique transpression. Evidence for southeast-side-up, dip-slip motion...

... Clapp and Deiss, 1931 Nelson and Dobell, 1961 McNamara Formation Mount Shields Formation McNamaro Formation Red Plume Banner Banner Banner Quartzite Quartzite Quartzite Quartzite Helena Formation Mount Shields Formation Shields Formation Shepard Shepard Shepard Shepard Miller Peak Quartzite Formation...

...) this thrust probably developed along the earlier-formed zone of basement weakness, and (4) this inferred major Laramide thrust may markedly affect presumed hydrocarbon potential. Fig. 2 —Relation of thickness of (a) Meade Peak and (b) Retort Members of Phosphoria Formation (Permian) to Medicine Lodge...

... subprovince, and two Archean terrains that may be allochthonous to the 3.0 Ga craton, (4) the Sierra Madre – Medicine Bow block, and (5) the Black Hills – Hartville block. A thick, fast lower crustal layer, imaged by Deep Probe, corresponds geographically with the Bighorn subprovince and may be an underplate...

.... Downstream, it skirted the southern end of the Carmen culmination and crossed the northern part of the Maiden Peak basement-cored culmination before occupying a longitudinal valley in the footwall of the Medicine Lodge thrust south of segment A. The Hawley Creek paleoriver flowed farther to the south...

... conglomerate, brown quartzite, and minor amounts of gray limestone. Detritus composing this formation was derived from uplands of the Antler orogenic belt in central Nevada. In the Pequop Mountains the Diamond Peak Formation is approximately 1,200 ft (366 m) thick ( Thorman, 1970 , p. 2425). The Chainman Shale...

...., 1993 ; Foster et al., 2006 ). These exposures of Paleoproterozoic and Archean basement occur in the Wyoming Province, the Medicine Hat and Grouse Creek blocks, and the Priest River and Clearwater complexes ( Fig. 1 ). These Precambrian rocks are exposed in scattered outcrops and areas extending from...

... per cent are rhyolite welded tuff and flow rock resembling both that in the Bivouac formation and that in the Teewinot formation of middle Pliocene age on Pilgrim Peak 5 miles north. The quartzite and volcanic fragments are about equally well rounded. The former are so much harder that they have...

... to be much more fertile for later melting than the adjacent Archean lithosphere, as exemplified by Cretaceous and younger magmatism and mineralization being largely confined to the Great Falls tectonic zone, rather than adjoining Archean lithosphere of either the Medicine Hat block or Wyoming craton (e.g...

...-lateral, strike-slip displacement. Folds just southeast of the Laramie Peak shear zone, with ages for syndeformational titanite growth in fold hinge areas ranging from 1755–1740 Ma, provide strong evidence for renewed shortening and continuation of the Medicine Bow Orogeny in the Laramie Mountains...

... Madre, MB = Medicine Bow Mountains, LM = Laramie Mountains, RH = Richeau Hills, LPSZ = Laramie Peak shear zone † z = zircon, s = sphene, a = apatite, b = baddeleyite, h = hornblende § (1) Premo and Van Schmus, 1989 ; (2) Snyder et al., 1995 ; (3) Cox et al., 1995 ; (4) Loucks et al., 1988...

... of the Medicine Bow Mountains ( Mears, 2001 ). Both lakes are in glacial till overlying predominantly quartzite bedrock and receive nearly all of their hydrologic input from snowfall and associated warm-season surface and subsurface flow ( Mensing et al., 2012 ). Small bedrock-dominated watersheds and a short...

... the Archean Wyoming province and Proterozoic Colorado province. The time of emplacement of the Horse Creek anorthosite complex coincides with late stages of the Medicine Bow orogeny, in which Proterozoic island arcs collided with the Wyoming province. The Horse Creek anorthosite complex was emplaced in a zone...