Reconnaissance geologic map of the Sliderock Mountain area, Sweet Grass and Stillwater counties, Montana
Miscellaneous Field Studies Map
2259
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Abstract
The remains of a deeply eroded Late Cretaceous stratovolcano centered near Sliderock Mountain dominate the map area. The volcano consists mostly of lahars, although basaltic andesite lava flows are also present. An extensively eroded, weakly mineralized hypabyssal intrusive complex, inferred to represent the volcano's solidified magma chamber, intrudes previously erupted lava flows and associated lahars. Cretaceous sandstone and shale and Paleozoic sedimentary rocks, principally limestone of the Madison Group, host the stratovolcano; remnants of these rocks are preserved as large xenoliths and roof pendants.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Reconnaissance geologic map of the Sliderock Mountain area, Sweet Grass and Stillwater counties, Montana |
| Series title | Miscellaneous Field Studies Map |
| Series number | 2259 |
| DOI | 10.3133/mf2259 |
| Edition | - |
| Year Published | 1994 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | Map: 31.37 x 33 inches |
| Country | United States |
| State | Montana |
| County | Stillwater County;Sweet Grass County |
| Other Geospatial | Sliderock Mountain |
| Scale | 50000 |
| Google Analytic Metrics | Metrics page |