| Bloomsburg Formation | |
|---|---|
| Stratigraphic range: Gorstian - Ludfordian[1] ~ | |
 A hand sample of the Bloomsburg Siltstone from Port Clinton, Pennsylvania | |
| Type | sedimentary |
| Underlies | Wills Creek Formation |
| Overlies | Clinton Group, McKenzie Formation, Mifflintown Formation, and Shawangunk Formation |
| Thickness | up to 5,000 feet (1,520 m)[2] |
| Lithology | |
| Primary | Siltstone |
| Other | Shale, Claystone, Sandstone, Limestone |
| Location | |
| Region | Appalachian Basin of eastern North America |
| Extent | Maryland, New Jersey, New York, Pennsylvania, and Virginia |
| Type section | |
| Named for | Bloomsburg, Pennsylvania |
| Named by | I. C. White, 1883[3] |
The Silurian Bloomsburg Formation is a mapped bedrock unit in Pennsylvania, New Jersey, New York and Maryland. It is named for the town of Bloomsburg, Pennsylvania, in which it was first described. The Bloomsburg marked the first occurrence of red sedimentary rocks in the Appalachian Basin.
- ^ Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
- ^ Wood, G.H., Trexler, J.P., Kehn, T.M., (1964). Geology of the West-Central Part of the Southern Anthracite Field and Adjoining Areas, Pennsylvania. United States Geological Survey, C-46.
- ^ White, I.C., 1883, The geology of the Susquehanna River region in the six Counties of Wyoming, Lackawanna, Luzerne, Columbia, Montour, and Northumberland: Pennsylvania Geological Survey Report of Progress, 2nd series, v. G7, 464 p.