page_title: Glenshaw Formation
hierarchical_section_title: Glenshaw Formation
caption_attribution_description: (downstream is to the lower left) The outcrop near the top of the photo consists of cherty limestones of the Brush Creek Limestone (Glenshaw Formation, lower Conemaugh Group, Missourian Series, lower Upper Pennsylvanian). The rocks in the shadows just above water level are mudshales. Locality: Island Run (at low flow), just downstream from Helmick Bridge (Helmic Bridge), southwest of the town of Eagleport, northwestern Morgan County, eastern Ohio, USA
context_page_description: The Glenshaw Formation is a mapped sedimentary bedrock unit in Pennsylvania, Maryland, West Virginia, and Ohio, of Pennsylvanian age. It is the lower of two formations in the Conemaugh Group, the upper being the Casselman Formation. The boundary between these two units is the top of the marine Ames Limestone. The Conemaugh Group overlies the Upper Freeport coal bed of the Allegheny Formation and underlies the Pittsburgh coal seam of the Monongahela Group.
  The Conemaugh Group consists of cyclic sequences of shale, siltstone, sandstone, red beds, thin impure limestone, and thin nonpersistent coal. Red beds are associated with landslides.
  The thickness of the Conemaugh Group averages about 400 feet in Ohio, and it ranges from 450 feet on the Ohio River in West Virginia to 520 feet in Washington County, Pennsylvania, and then to 890 feet in Somerset County, Pennsylvania.
  The Glenshaw formation was originally mapped in Pennsylvania by Flint, but was extended into West Virginia by Cardwell et al. in 1968. It is also recognized in eastern Ohio.
context_section_description: The Glenshaw Formation is a mapped sedimentary bedrock unit in Pennsylvania, Maryland, West Virginia, and Ohio, of Pennsylvanian age.  It is the lower of two formations in the Conemaugh Group, the upper being the Casselman Formation. The boundary between these two units is the top of the marine Ames Limestone. The Conemaugh Group overlies the Upper Freeport coal bed of the Allegheny Formation and underlies the Pittsburgh coal seam of the Monongahela Group.
  The Conemaugh Group consists of cyclic sequences of shale, siltstone, sandstone, red beds, thin impure limestone, and thin nonpersistent coal.   Red beds are associated with landslides.
  The thickness of the Conemaugh Group averages about 400 feet in Ohio, and it ranges from 450 feet on the Ohio River in West Virginia to 520 feet in Washington County, Pennsylvania, and then to 890 feet in Somerset County, Pennsylvania.
  The Glenshaw formation was originally mapped in Pennsylvania by Flint, but was extended into West Virginia by Cardwell et al. in 1968.  It is also recognized in eastern Ohio.
caption: Outcrops of Brush Creek Limestone, Glenshaw Formation, in Ohio
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