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Album caption: Laharic breccia in the lower member of the Livingston Formation. Hammer for scale; handle is about 35 cm long. Published as Figure 5 in U.S. Geological Survey Bulletin 1665, "The Livingston Formation in the Madison Range of Southwestern Montana."
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The geology of western and northern Gallatin National Forest was mapped in two parts as part of an evaluation of its mineral resource potential by the USGS. Previously, the western part was released as Map A and the northern part as Map B of USGS Geologic Investigations Series Map I-2584. These maps were compiled, digitized, and produced using the USGS software program GSMAP. All the original source maps were simplified on mylar overlays, digitized at their original map scales and projections, and then merged into the final maps. After editing, the digital maps were filtered to remove all points not necessary for improving resolution at a scale of 1:126,720 (2 mi per in., the scale used by the USDA Forest Service)....
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Album caption: Rounded volcanic boulder in upper member of the Livingston Formation. Head of hammer is about 20 cm long. Published as Figure 6 in U.S. Geological Survey Bulletin 1665, The Livingston Formation in the Madison Range of Southwestern Montana. 1987.
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The Ennis 1:100,000 quadrangle lies within both the Laramide (LateCretaceous to early Tertiary) foreland province of southwesternMontana and the northeastern margin of the middle to late TertiaryBasin and Range province.The oldest rocks in the quadrangle are Archean high-grade gneiss, andgranitic to ultramafic intrusive rocks that are as old as about 3.0Ga. The gneiss includes a supracrustal assemblage of quartz-feldspargneiss, amphibolite, quartzite, and biotite schist and gneiss. Thebasement rocks are overlain by a platform sequence of sedimentaryrocks as old as Cambrian Flathead Quartzite and as young as UpperCretaceous Livingston Group sandstones, shales, and volcanic rocks.The Archean crystalline rocks crop...
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Album caption: Stratigraphically significant pollen and spores from the Livingston Formation of the Madison Range and underlying beds. A., b - Proteacidites spp.; c - Aquilapollenites sp. (equatorial view); d - A Aquilapollenites sp. (polar view); e - Pseudoplicapollis newmanii; f- Complexiopolllis sp.; g, h - Distaltriangulisporites sp. C, (two levels of focus on the same specimen): I - Minerisporites pseudorichardson ii. Specimens in a-d and I are from the Livingston Formation. All specimens enlarged 1000X except i, 1200X. Published as Figure 7 in the U.S. Geological Survey Bulletin 1665, The Livingston Formation in the Madison Range of Southwestern Montana. 1987.
    map background search result map search result map Geologic map of the Ennis 30' X 60' quadrangle, Madison andGallatin Counties, Montana, and Park County, Wyoming Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Western portion Geologic map of the Ennis 30' X 60' quadrangle, Madison andGallatin Counties, Montana, and Park County, Wyoming Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Western portion