| 词条 | Weverton Formation |
| 释义 |
| name = Weverton Formation | image = | caption = | type = Formation | age = Cambrian | period = Cambrian | prilithology = sandstone, quartzite, | otherlithology = shale, siltstone | namedfor = Weverton, Maryland | namedby = | region = Appalachia, Mid-Atlantic United States, and Southeastern United States | country = United States | coordinates = | unitof = Chilhowee Group[1] | subunits = Buzzard Knob Member, Maryland Heights Member, and Owens Creek Member[2] | underlies = Harpers Formation | overlies = Catoctin Formation and London Conglomerate | thickness = | extent = {{Flag|Maryland}}, {{Flag|Pennsylvania}}, {{Flag|Virginia}}, and {{Flag|West Virginia}}[3] | area = | map = | map_caption = }} The Weverton Formation is a quartzite geologic formation in Maryland, Virginia, West Virginia, and Pennsylvania. It is considered the basal member of the Chilhowee Group. [1] The Weverton Formation dates back to the Cambrian period. DescriptionThe Weverton Formation is composed of three members: the Buzzard Knob Member, Maryland Heights Member, and Owens Creek Member[2]. The Buzzard Knob member is a coarse-grained quartzite with pervasive cross-beds. The Maryland Heights member consists of metamorphosed siltstone, coarse-grained metamorphosed greywacke, and quartzite. The Owens Creek Member is a coarse-grained to conglomeratic metamorphosed greywacke.[2][4] The formation was deposited in an alluvial environment[4]. The Weverton Formation is considered the main ridge forming unit in the Blue Ridge Mountains of Maryland.[2] HistoryThe Weverton Formation is sometimes incorrectly spelled Weaverton and has been called the Weverton Sandstone or the Weverton Quartzite.[1][5][6] It was divided into three members originally called the lower, middle, and upper member.[1][2] These members were informally called the Loft Mountain Member, the Oregon Hollow Member, and the Dismal Hollow Member before receiving their formal names in 1992.[2] References1. ^1 2 3 {{cite journal |last1=King |first1=Philip B. |title=Geology of the Elkton area, Virginia |journal=U.S. Geological Survey Professional Paper |date=1950 |volume=230 |pages=17-19 |url=https://pubs.usgs.gov/pp/0230/report.pdf |accessdate=29 June 2018}} 2. ^1 2 3 4 5 {{cite journal |last1=Brezinski |first1=David K. |title=Lithostratigraphy of the western Blue Ridge cover rocks in Maryland |journal=Maryland Geological Survey Report of Investigations |date=1992 |volume=55 |pages=9-18 |url=http://www.mgs.md.gov/reports/RI_55.pdf |accessdate=29 June 2018}} 3. ^[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] 4. ^1 {{cite journal |last1=Southworth |first1=Scott |last2=Brezinski |first2=Donald K. |title=Geology of the Harpers Ferry quadrangle, Virginia, Maryland, and West Virginia |journal=U.S. Geological Survey Bulletin |date=1996 |volume=2123 |pages=12-13 |url=https://pubs.usgs.gov/bul/2123/report.pdf |accessdate=29 June 2018}} 5. ^{{cite book |last1=Williams |first1=G. H. |last2=Clark |first2=W. B. |title=Maryland, its resources, industries, and institutions; geology |date=1893 |publisher=Sun job printing office |location=Baltimore, MC |page=68 |url=https://books.google.com/books?id=DkgVAAAAYAAJ&pg |accessdate=29 June 2018}} 6. ^{{cite journal |last1=Burton |first1=William C. |last2=Froelich |first2=Albert J. |last3=Pomeroy |first3=John S. |last4=Lee |first4=K. Y. |title=Geology of the Waterford quadrangle, Virginia and Maryland, and the Virginia part of the Point of Rocks quadrangle |journal=U.S. Geological Survey Bulletin |date=1995 |volume=2095 |pages=15-16 |url=https://pubs.usgs.gov/bul/2095/report.pdf |accessdate=29 June 2018}}
1 : Cambrian West Virginia |
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