GEOLEX

Summary of Citation: Tuscarora

Publication:
Darton, N.H. and Taff, J.A., 1896, Description of the Piedmont
   sheet [West Virginia-Maryland]: U.S. Geological Survey Geologic
   Atlas of the United States, Piedmont folio, no. 28, 6 p.

Usage in Publication:
Tuscarora quartzite*

Modifications:	Geologic Province:	Dominant Lithology:
Named	Appalachian basin	Quartzite

Summary:
Consists of homogenous mass of coarse, white or gray sand in very hard siliceous matrix. Some small pebbles occur widely scattered. Beds are often very massive, particularly in upper portion. Thickness 480 ft. Overlies Juniata formation; underlies Cacapon sandstone. Publication includes geologic map.

Summary of Citation: Tuscarora

Publication:
Clark, W.B., 1897, Outline of present knowledge of the physical
   features of Maryland: Maryland Geological Survey Volume
   Series, v. 1, pt. 3, p. 172-188

Usage in Publication:
Tuscarora quartzite

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Appalachian basin

Summary:
Named for Tuscarora Mountain, PA. Also known as white Medina sandstone. Consists chiefly of sandstone, hard and massive, generally white to gray. 1500 ft thick.

Summary of Citation: Tuscarora

Publication:
Chen, Ping-fan, 1977, Lower Paleozoic stratigraphy, tectonics,
   paleogeography, and oil/gas possibilities in the Central
   Appalachians (West Virginia and adjacent states) part 1;
   stratigraphic maps: West Virginia Geological and Economic
   Survey Report of Investigations, no. 26-1, 141 p.

Usage in Publication:
Tuscarora Formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Appalachian basin

Summary:
The Tuscarora Formation is included as the uppermost formation in the Judy Gap Group of WV. Overlies the Juniata Formation of the Judy Gap Group and underlies the Clinton Group.

Summary of Citation: Tuscarora

Publication:
Faill, R.T., Glover, A.D. and Way, J.H., 1989, Geology and
   mineral resources of the Blandburg, Tipton, Altoona, and
   Bellwood quadrangles, Blair, Cambria, Clearfield and Centre
   Counties, Pennsylvania: Pennsylvania Geological Survey
   Topographic and Geologic Atlas, 4th series, 86, 209 p., scale
   1:24,000 and 1:48,000

Usage in Publication:
Tuscarora Formation

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Appalachian basin

Summary:
The Tuscarora is recognized throughout the Valley and Ridge province of PA, MD, VA, and WV and correlates with the White Medina sandstone under the Appalachian Plateau to the north. Eastward it grades laterally into the Shawangunk Formation in eastern PA and NJ. The Castanea (red beds) is generally included as a member at the top of the Tuscarora, though originally defined as a separate formation. It is difficult to map separately and is at places interbedded with the typical quartzite of the Tuscarora. The sandstone of the Tuscarora consists of light-gray to light-brown fine- to medium-grained, medium- to thick-bedded quartzite, which weathers white. Interbedded with the quartzite are thin layers of silty shale. The Castanea Member consists of similar quartzite beds which are mottled grayish red to very dusky red. Lower contact with the Juniata appears to be gradational locally. Upper contact is not exposed but is assumed to be conformable. Thickness, calculated from dip and map-pattern width is 170+/-15 m. Most complete exposures are in two quarries in the Frankstown quad at the crest and south end of Canoe Mountain. Exposures of the Castanea Member are rare. Only known exposure in mapped area is along Kettle Road at the foot of Brush Mountain. Age is Early Silurian.

Summary of Citation: Tuscarora

Publication:
Dennison, J.M., Bambach, R.K., Dorobek, S.L., Filer, J.K. and
   Shell, J.A., 1992, Silurian and Devonian unconformity in
   southwestern Virginia, IN Dennison, J.M., and Stewart, K.G.,
   eds., Geologic field guides to North Carolina and vicinity:
   University of North Carolina-Chapel Hill, Department of
   Geology Geologic Guidebook, no. 1, Joint annual meeting of
   Geological Society of America, Southeastern Section, Society
   of Economic Paleontologists and Mineralogists, Eastern Section,
   and Paleontological Society, Southeastern Section, Winston-Salem,
   NC, March, 1992, p. 79-105

Usage in Publication:
Tuscarora Sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Age modified	Appalachian basin

Summary:
Authors believe the Ordovician-Silurian boundary falls within the Tuscarora Sandstone. They claim that an unconformity lies between the lower and upper Tuscarora, and it is within this hiatus of about 8 m.y. that the boundary occurs.

Summary of Citation: Tuscarora

Publication:
Boucot, A.J., Gray, Jane and Hoskins, D.M., 1994, New hughmilleriid
   (Eurypterida) occurrence from the Tuscarora Formation, central
   Pennsylvania, and its environmental interpretation, IN Landing,
   Ed, ed., Studies in stratigraphy and paleontology in honor
   of Donald W. Fisher: New York State Museum Bulletin, no. 481,
   p. 21-23

Usage in Publication:
Tuscarora Formation

Modifications:	Geologic Province:	Dominant Lithology:
Biostratigraphic dating	Appalachian basin

Summary:
A second eurypterid occurrence from the Tuscarora is reported at the Kishacoquillas Gap, central PA. It occurs in either a nonmarine or a brackish-estuarine environment. A definite age cannot be determined, but it is probably Llandoverian.