Geologic map of the Alley Spring quadrangle, Shannon County, Missouri
Scientific Investigations Map
3161
Links
- More information: USGS Index Page (html)
- Plate: Sim 3161 (pdf)
- NGMDB Index Page: National Geologic Map Database Index Page
- Download citation as: RIS | Dublin Core
Abstract
The Alley Spring 7.5-minute quadrangle is located in south-central Missouri within the Salem Plateau region of the Ozark Plateaus physiographic province. About 1,990 feet (ft) of flat-lying to gently dipping Lower Paleozoic sedimentary rocks, mostly dolomite, chert, sandstone, and orthoquartzite, overlie Mesoproterozoic volcanic rocks. A small exposure of the volcanic rocks exists near the eastern edge of the quadrangle. Unconsolidated residuum, colluvium, terrace deposits, and alluvium overlie the sedimentary rocks. Karst features, such as sinkholes, caves, and springs, have formed in the carbonate rocks. Many streams are spring fed. Alley Spring, the largest karst spring in the quadrangle, has an average discharge of 81 million gallons per day. The topography is a dissected karst plain with elevation ranging from 630 ft where the Jacks Fork River exits the quadrangle to more than 1,140 ft at numerous places in the northern half of the quadrangle. The most prominent physiographic feature is the valley of the Jacks Fork River. Most of the land in the quadrangle is privately owned and used primarily for grazing cattle and horses and growing timber. A large minority of the land within the quadrangle is publicly owned, either by the Missouri State Forests or by the Ozark National Scenic Riverways of the National Park Service. Geologic mapping for this investigation was conducted in 2003 and 2004.
Suggested Citation
Weary, D.J., Orndorff, R.C., 2012, Geologic map of the Alley Spring quadrangle, Shannon County, Missouri: U.S. Geological Survey Scientific Investigations Map 3161, 1 Plate: 55 x 33 inches, https://doi.org/10.3133/sim3161.
ISSN: 2329-132X (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Geologic map of the Alley Spring quadrangle, Shannon County, Missouri |
| Series title | Scientific Investigations Map |
| Series number | 3161 |
| DOI | 10.3133/sim3161 |
| Year Published | 2012 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | National Center |
| Description | 1 Plate: 55 x 33 inches |
| Country | United States |
| State | Missouri |
| County | Shannon County |
| Other Geospatial | Alley Spring quadrangle |
| Datum | 1927 North American datum |
| Projection | Polyconic, Universal Transverse Mercator zone 15 |
| Scale | 24000 |