The Needmore Formation was originally described by Willard and Cleaves in 1939 as a dark- to medium-gray limy shale, based on exposures in southern Fulton County, Pennsylvania. They considered it part of the Onondaga Group.[2]
DeWitt and Colton (1964) described the Needmore as "soft calcareous medium dark-brownish-gray and greenish-gray shale and mudrock...and soft, slightly calcareous very fissile brownish-black shale" that is not resistant to weathering. They estimated its thickness in their study area (southern Bedford County, Pennsylvania, and most of Allegany County, Maryland) as approximately 150 feet.[3]
Fossilsedit
DeWitt and Colton (1964) identified brachiopods (Coelospira acutiplicata, Eodevonaria arcuata), trilobites (Viaphacops cristata), and ostracods (Favulella favulosa) in the Needmore.[3]
Relative age dating places the Needmore in the middle Devonian.
Referencesedit
^Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
^ abWillard, Bradford, and Cleaves, A.B., 1939, Ordovician-Silurian relations in Pennsylvania: Geological Society of America Bulletin, v. 50, no. 7, p. 1165-1198.
^ abdeWitt, W. Jr., and Colton, G. W., 1964, Bedrock geology of the Evitts Creek and Pattersons Creek Quadrangles, Maryland, Pennsylvania, and West Virginia: U.S. Geological Surveys Bull. 1179, pl 1 and 2. [1]
This article about a specific stratigraphicformation in Maryland is a stub. You can help Wikipedia by expanding it.
needmore, shale, devonian, needmore, formation, mapped, bedrock, unit, pennsylvania, maryland, virginia, west, virginia, needmore, formationstratigraphic, range, emsian, typesedimentaryunderliesmarcellus, shale, millboro, shaleoverliesoriskany, formationlithol. The Devonian Needmore Formation or Needmore Shale is a mapped bedrock unit in Pennsylvania Maryland Virginia and West Virginia Needmore FormationStratigraphic range Emsian 1 TypesedimentaryUnderliesMarcellus Shale and Millboro ShaleOverliesOriskany FormationLithologyPrimaryshaleLocationRegionAppalachian MountainsCountryUnited StatesExtentMaryland Pennsylvania Virginia and West VirginiaType sectionNamed forNeedmore PennsylvaniaNamed byWillard and Cleaves 1939 2 Contents 1 Description 1 1 Fossils 1 2 Notable Exposures 2 Age 3 ReferencesDescription editThe Needmore Formation was originally described by Willard and Cleaves in 1939 as a dark to medium gray limy shale based on exposures in southern Fulton County Pennsylvania They considered it part of the Onondaga Group 2 DeWitt and Colton 1964 described the Needmore as soft calcareous medium dark brownish gray and greenish gray shale and mudrock and soft slightly calcareous very fissile brownish black shale that is not resistant to weathering They estimated its thickness in their study area southern Bedford County Pennsylvania and most of Allegany County Maryland as approximately 150 feet 3 Fossils edit DeWitt and Colton 1964 identified brachiopods Coelospira acutiplicata Eodevonaria arcuata trilobites Viaphacops cristata and ostracods Favulella favulosa in the Needmore 3 Notable Exposures edit Type locality is between Needmore and Warfordsburg in southern Fulton County Pennsylvania Age editRelative age dating places the Needmore in the middle Devonian References edit Paleozoic Sedimentary Successions of the Virginia Valley amp Ridge and Plateau a b Willard Bradford and Cleaves A B 1939 Ordovician Silurian relations in Pennsylvania Geological Society of America Bulletin v 50 no 7 p 1165 1198 a b deWitt W Jr and Colton G W 1964 Bedrock geology of the Evitts Creek and Pattersons Creek Quadrangles Maryland Pennsylvania and West Virginia U S Geological Surveys Bull 1179 pl 1 and 2 1 nbsp This article about a specific stratigraphic formation in Maryland is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Needmore Shale amp oldid 1201889272, wikipedia, wiki, book, books, library,
