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Interstate 99 Skytop roadcut, Skytop, State College, Centre Co., Pennsylvania, USA

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Gossan zone in the Bald Eagle Sandstone from the I-99 Roadcut

Interstate 99 Skytop roadcut, Skytop, State College, Centre Co., Pennsylvania, USA
Acid Rock Drainage pool, I-99 construction near Skytop, PA

Interstate 99 Skytop roadcut, Skytop, State College, Centre Co., Pennsylvania, USA
Gossan zone in the Bald Eagle Sandstone from the I-99 Roadcut

Interstate 99 Skytop roadcut, Skytop, State College, Centre Co., Pennsylvania, USA
Acid Rock Drainage pool, I-99 construction near Skytop, PA

Interstate 99 Skytop roadcut, Skytop, State College, Centre Co., Pennsylvania, USA
Gossan zone in the Bald Eagle Sandstone from the I-99 Roadcut

Interstate 99 Skytop roadcut, Skytop, State College, Centre Co., Pennsylvania, USA
 
Latitude & Longitude (WGS84): 40° 50' North , 77° 58' West
Latitude & Longitude (decimal): 40.83333,-77.96667
Köppen climate type:Dfb : Warm-summer humid continental climate


First road cut along Interstate 99 at Skytop, in sandstone, revealing extensive pyrite vein mineralization with associated Pb-Zn minerals and a wide variety of secondaries. Crushed rocks quickly weathered to secondary sulfates giving the water a very acidic pH. Primary mineralization is pyrite with associated marcasite, sphalerite, and minor galena, chalcopyrite. Other non-metallic minerals are pinkish massive ankerite and baryte. REE phosphates have also been documented, monazite containing the lighter lanthanides as well a some thorium; xenotime-(Y) containing the heavier lanthanides as well as yttrium.

NOTE: Coordinates were generated based on highway, topographic and satellite imagery maps and place the location on center of the roadcut.

Smith (1977), p. 209) noted that A.V. Heyl (personal communication, 1972)reported P. D. Krynine's finding barite and galena in veinlets in the lower Tuscarora quartzite in this area. Smith himself reported major [>10%] amounts of finely crystalline pyrite and drusy quartzite in the Bald Eagle Sandstone. The bitter odor of the mineralization was noticable while driving by prior to the start of construction of I-99.


Mineral List


36 valid minerals.

Rock Types Recorded

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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 Macrostrat.org

Ordovician
443.8 - 485.4 Ma



ID: 3019889
Juniata Formation

Age: Ordovician (443.8 - 485.4 Ma)

Stratigraphic Name: Juniata Formation

Description: Grayish-red, very fine to medium-grained, crossbedded sandstone, and grayish-red siltstone and shale; merges with underlying Bald Eagle Formation to the south; not present east of Susquehanna River, except at Spitzenberg Hill area (Berks County).

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

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License



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References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Smith, II, R. C. (1977) Zinc and Lead Occurrences in Pennsylvania, Pennsylvania Geological Survey, 4th series, Mineral Resource Report 72, 318p.
Hammarstrom, J.M., Brady, K., and Cravotta, C.A., III (2005) Acid-rock drainage at Skytop, Centre County, Pennsylvania, 2004. USGS Open-File Report 2005-1148
Pennsylvania Chapter of the Friends of Mineralogy Newsletter, 32 (1-2), 2-3 (see http://www.mindat.org/mesg-5-40798.html)

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