Harpers Schist. Shows older folded schistosity parallel to bedding cut by younger cleavage inclined to bedding.
Type
Metamorphic
Unit of
Chilhowee Group
Sub-units
Snowden Member (VA), Montalto Quartzite Member (PA)
Underlies
Antietam Formation
Overlies
Weverton Formation
Lithology
Primary
Schist
Other
Phyllite, shale
Location
Region
Appalachia, Mid-Atlantic United States, and Southeastern United States
Country
United States
Extent
Maryland, Pennsylvania, Virginia,[1] West Virginia
Type section
Named for
Harpers Ferry, West Virginia
Named by
Arthur Keith (1894)[2]
Photomicrograph of Harpers Schist
The Harpers Formation is a geologic formation in Maryland, Pennsylvania, Virginia, and West Virginia, consisting of schist, phyllite, and shale. It dates back to the early Cambrian period. It is considered part of the Chilhowee Group.
^Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
^Arthur Keith, 1894. Harpers Ferry folio, Virginia, Maryland, West Virginia. United States Geological Survey Geologic atlas of the U.S. Folio 10. Field edition. Washington D.C., engraved and printed by the US Geological Survey. 5p., 5 maps. folio.
Pennsylvania. Quartzite sample of HarpersFormation from near Verona, Virginia Harpers Shale by Jefferson Rock in Harpers Ferry, West Virginia Sample of...
is closely associated with the HarpersFormation, Weverton Formation, and the Loudoun Formation. The Catoctin Formation lies over a granitic basement rock...
The Harper Ranch Formation is a geologic formation in British Columbia. It preserves fossils dating back to the Permian period. Earth sciences portal Canada...
portion to converge and attack Harpers Ferry from three directions. Colonel Dixon S. Miles, Union commander at Harpers Ferry, insisted on keeping most...
over the granite. This was followed by the Weverton Formation, HarpersFormation, and Antietam formation in which sand and rock sedimented on the ocean floor...
the Triassic Stockton Formation unconformably overlies the folded Ledger. The HarpersFormation overlies the Ledger Formation due to a thrust fault in...
The Marcellus Formation or the Marcellus Shale is a Middle Devonian age unit of sedimentary rock found in eastern North America. Named for a distinctive...
Jefferson Rock is a rock formation on the Appalachian Trail in Harpers Ferry, West Virginia. It consists of several large masses of Harpers shale, piled one upon...
contains four formations; the Loudoun Formation, Weverton Formation, HarpersFormation and Antietam Formation. Another name for the Harpersformations is the...
Plateau Southworth, Scott; Brezinski, Donald K. (1996). "Geology of the Harpers Ferry quadrangle, Virginia, Maryland, and West Virginia" (PDF). U.S. Geological...
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it outcrops; in others, especially its Southern Ontario portion, the formation can be less prominent as a local surface feature.[citation needed] In...
shale with some sandstone. There are two main formations encompassed by the group: the Mahantango Formation and the Marcellus Shale. In southwestern Virginia...
the Portage Group. The West Falls formation is bounded above by the Java Formation and below by the Sonyea Formation. It comprises the Angola Shale and...
The Kanawha Formation is a geologic formation in West Virginia. It preserves fossils dating back to the Carboniferous period. Earth sciences portal Paleontology...
The Oswego Formation is a geologic formation in West Virginia. It dates back to the Ordovician period. Earth sciences portal Paleontology portal Paleozoic...
The Swift Run Formation is a geologic formation in Virginia and West Virginia. It dates back to the Neoproterozoic. Earth sciences portal Virginia portal...
The Maccrady Formation is a geologic formation in West Virginia. It preserves fossils dating back to the Carboniferous period. Earth sciences portal Paleontology...
The Genesee Formation (Group) is a geologic formation in New York. It is equivalent the Harrell Shale in Pennsylvania. It date back to the Upper Devonian...
The New River Formation is a geologic formation in West Virginia. It preserves fossils dating back to the Carboniferous period. Earth sciences portal...
Sandstone is a sandstone geologic formation in West Virginia, Virginia, Pennsylvania, and Maryland. The formation includes the Cedar Creek Limestone...
The Hampton Formation is a geologic formation in Iowa. It preserves fossils dating back to the Carboniferous period. Earth sciences portal Iowa portal...
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