| 词条 | Harpers Formation |
| 释义 |
| name = Harpers Formation | image = File:Bulletin 799 Plate 8A Harpers Schist.jpg | caption = Harpers Schist. Shows older folded schistosity parallel to bedding cut by younger cleavage inclined to bedding. | type = Formation | age = Cambrian | period = Cambrian | prilithology = Schist | otherlithology = Phyllite, Shale | namedfor = Harpers Ferry, West Virginia | namedby = Arthur Keith (1894)[1] | region = Appalachia, Mid-Atlantic United States, and Southeastern United States | country = United States | coordinates = | unitof = Chilhowee Group | subunits = Snowden Member (VA), Montalto Quartzite Member (PA) | underlies = Antietam Formation | overlies = Weverton Formation | thickness = | extent = Maryland, Pennsylvania, Virginia[2], West Virginia | area = | map = | map_caption = }} 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. Notable exposuresThe type section is in gorges of the Potomac River and the Shenandoah River at Harpers Ferry. {{Portal|Earth sciences|West Virginia|Paleontology|Cambrian|Paleozoic}}References1. ^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. 2. ^[https://vtechworks.lib.vt.edu/bitstream/handle/10919/19078/Read%20and%20Eriksson.pdf?sequence=1 Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau]
1 : Cambrian West Virginia |
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