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Stoutameyer Branch (Stotameyer Creek), West Augusta, Augusta Co., Virginia, USA

This page kindly sponsored by Robert Rothenberg
Miarolitic cavities in nepheline syenite

Stoutameyer Branch, West Augusta, Augusta Co., Virginia, USA
View parallel to orientation planes of miarolitic cavities

Stoutameyer Branch, West Augusta, Augusta Co., Virginia, USA
Latitude & Longitude (WGS84): 38° 17' 4'' North , 79° 13' 39'' West
Latitude & Longitude (decimal): 38.28444,-79.22750
Köppen climate type:Cfa : Humid subtropical climate

Wrike and Kearns (2007) reported that boulders and cobbles of miarolitic nepheline syenite occur in the bed of "Stotameyer Creek". On the USGS topographic map this drainage is called Stoutameyer Branch. Material was easily located in that part of the stream adjacent to Stover Shop road, just north of Route 250.

In this gray, dense brittle rock the cavities are highly flattened and occur in planar arrays. Wrike and Kearns (2007) note that the mineral assemblage in the miarolitic cavities is similar to that of the Buck Hill intrusion several miles to the northeast.

Mineral List

3 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

358.9 - 419.2 Ma

ID: 2744936
Chemung Formation (redefined as Foreknobs Formation)

Age: Devonian (358.9 - 419.2 Ma)

Stratigraphic Name: Foreknobs Formation

Description: Chemung Formation (Hall, 1839). Redefined as the Foreknobs Formation (Dennison, 1970). Sandstone and shale, dark-gray and greenish-gray, fine-grained, thin- to thick-bedded, lithic sandstone and interbedded greenish gray, fissile, clay shale. Minor quartz-pebble conglomerate, thin red sandstone, and locally, fossil shell beds. Very thin or absent in southwestern Virginia; thickens to about 2500 feet northeastward in Frederick County. Gradational contact with underlying Brallier Formation and equivalent to part of the Chattanooga Shale to the southwest. Redefined and described as part of the Greenland Gap Group by Dennison (1970).

Comments: Appalachian Plateaus and Valley and Ridge

Lithology: Major:{shale,sandstone}, Minor:{conglomerate}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Wrike, C. and Kearns, L. (2007), A Study of Syenite Dikes Possibly Related to the Buck Hill Intrusion, Augusta County, Virginia, 2007 Student Research Symposium, The Department of Geology and Environmental Science, James Madison University.
Kearns, L. et. al. (2016) Mineralogic study of microminerals in miarolitic cavities in alkali dikes, Augusta County, Virginia: Rocks and Minerals: 91 (4): 369-370.

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