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Geologic units in Cameron county, Pennsylvania

Pottsville Formation (Pennsylvanian) at surface, covers 10 % of this area
Pottsville Formation - Predominantly gray sandstone and conglomerate; also contains thin beds of shale, claystone, limestone, and coal; includes Olean and Sharon conglomerates of northwestern Pennsylvania; thin marine limestones present in Beaver, Lawrence, and Mercer Counties; minable coals and commercially valuable high-alumina clays present locally.
Lithology: sandstone; conglomerate; shale; siltstone; claystone; limestone; coal
Allegheny Formation (Pennsylvanian) at surface, covers 1 % of this area
Allegheny Formation - Cyclic sequences of sandstone, shale, limestone, clay, and coal; includes valuable clay deposits and Vanport Limestone; commercially valuable Freeport, Kittanning, and Brookville-Clarion coals present; base is at bottom of Brookville-Clarion coal.
Lithology: sandstone; shale; limestone; clay or mud; coal
Shenango Formation through Oswayo Formation, undivided (Mississippian and Devonian) at surface, covers 0.5 % of this area
Shenango Formation through Oswayo Formation, undivided - Greenish-gray, olive, and buff sandstone and siltstone, and gray shale in varying proportions; includes "Pocono" ("Knapp") and Oswayo of earlier workers; difficult lithologic distinction between Oswayo and "Knapp"- "Pocono" south and east of type area at Olean, N. Y.; contains marine fossils; includes lateral equivalents of Shenango Formation, Cuyahoga Group, Corry Sandstone, Bedford Shale, and Cussewago Sandstone, plus Oswayo Formation.
Lithology: sandstone; siltstone; shale
Huntley Mountain Formation (Mississippian and Devonian) at surface, covers 5 % of this area
Huntley Mountain Formation - Greenish-gray and light-olive-gray, flaggy, fine-grained sandstone, siltstone, and a few red shale interbeds; includes lower "Pocono" plus "Oswayo" of earlier workers. Forms transition between Catskill Formation and Burgoon Sandstone.
Lithology: sandstone; siltstone; shale
Burgoon Sandstone (Mississippian) at surface, covers 0.7 % of this area
Burgoon Sandstone - Buff, medium-grained, crossbedded sandstone; includes shale and coal; in places, contains conglomerate at base; contains plant fossils; equivalent to Pocono Formation of Ridge and Valley province.
Lithology: sandstone; conglomerate; shale; coal
Lock Haven Formation (Devonian) at surface, covers 2 % of this area
Lock Haven Formation - Interbedded olive-gray mudstone, siltstone, sandstone, and thin conglomerate; marine fossils throughout; "Chemung" of earlier workers. Laterally equivalent to Scherr and Foreknobs Formations.
Lithology: mudstone; siltstone; sandstone; conglomerate
Catskill Formation (Devonian) at surface, covers 0.8 % of this area
Catskill Formation - Grayish-red sandstone, siltstone, shale, and mudstone; locally conglomeratic; contains gray sandstone in upper part; lithologies arranged in fining-upward cycles; equivalent to the Hampshire Formation south of Pennsylvania.
Lithology: sandstone; siltstone; shale; mudstone; conglomerate

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Page Last modified: 13:39 on 25-Apr-2014