WebWissahickon to group rank containing the Loch Raven Schist as well as other formations, and he changed the Glenarm series to Glenarm Supergroup containing the Setters … http://www.mgs.md.gov/publications/report_pages/RI_27.html
PGS History - philageo.org
WebThe Glenarm Series is changed to the Glenarm Supergroup. The Setters Formation and the Cockeysville Marble are each divided into six units of member and lens rank. The Wissahickon Formation is elevated to group status and divided into six formations and numerous units of lesser rank. The Wissahickon Formation is a mapped bedrock unit in Pennsylvania, New Jersey, and Delaware. It is named for the Wissahickon gorge in Fairmount Park, Philadelphia. In Maryland formations, the term "Wissahickon" is no longer used. Rocks in this classification have since been divided into several units, such as … See more The Wissahickon is described as a pelitic schist and gneiss with interlayers of quartzite. Color is highly variable as is the mineralogy. A general description for the unit is a silver to brown garnet mica-schist. Metamorphic grade See more The current map sought to divide the Wissahickon into three informal units. The type described here has been the restricted … See more • Geology portal • Geology of Pennsylvania • Geology of Delaware See more Depositional age The age indicated on the most recent geologic map of southeast Pennsylvania shows the Wissahickon being Ediacaran to Cambrian in age. This age is a relative date since the sediments that created the Wissahickon are … See more Wissahickon schist is quarried as a building stone and is used primarily as a decorative stone rather than a weight bearing stone. … See more • Secompmap See more banchon jai ngim
Legend (topo/Geology_Age) - Pennsylvania Department of …
WebDec 2, 2024 · Stratigraphy: Wissahickon Schist (a.k.a. Wissahickon Formation), Glenarm Series (Glenarm Supergroup), Neoproterozoic to Cambrian; metamorphism in the Late Ordovician to Silurian Locality: Jarrettsville, western Harford … WebThe designation "Wissahickon formation" is no longer used in Maryland. The legend presented here was reproduced from the 1968 Geologic Map of Maryland, but does not reflect current theory. The "Wissahickon' group has been broken up into various divisions by several authors. WebGlenarm Wissahickon"" formation (Probably lower Paleozoic) at surface, covers 24 % of this area. Lithologically similar to oligoclase-mica schist of the Wissahickon Formation … banchot hindi meaning