| Bald Eagle Formation | |
|---|---|
| Stratigraphic range: Late Ordovician | |
 | |
| Type | sedimentary |
| Underlies | Juniata Formation |
| Overlies | Reedsville Formation |
| Thickness | 275 +/-25 m[1] |
| Lithology | |
| Primary | sandstone |
| Other | conglomerate, shale |
| Location | |
| Region | Appalachian Mountains |
| Extent | Pennsylvania, Maryland, West Virginia |
| Type section | |
| Named for | Bald Eagle Mountain, Pennsylvania |
| Named by | A. W. Grabau[2] |
The Ordovician Bald Eagle Formation is a mapped bedrock unit in central Pennsylvania, USA. It is a ridge-forming unit in the Appalachian Mountains.
- ^ Faill, R.T., Glover, A.D., and Way, J.H., 1989, Geology and mineral resources of the Blandburg, Tipton, Altoona, and Bellwood quadrangles, Blair, Cambria, Clearfield and Centre Counties, Pennsylvania: Pennsylvania Geological Survey Topographic and Geologic Atlas, 4th series, 86, 209 p., scale 1:24,000 and 1:48,000
- ^ Grabau, A.W., 1909, Physical and faunal evolution of North America during Ordovicic, Siluric, and Early Devonic time: Journal of Geology, v. 17, p. 209-252.