| Baltimore Gneiss | |
|---|---|
| Stratigraphic range: Precambrian | |
 Photomicrograph of Baltimore Gneiss | |
| Type | Geological formation |
| Underlies | Setters Formation |
| Lithology | |
| Primary | Gneiss |
| Other | Paragneiss and amphibolite |
| Location | |
| Region | Piedmont of eastern North America |
| Country |  United States |
| Extent | Maryland |
| Type section | |
| Named for | Baltimore |
The Baltimore Gneiss is a Precambrian geological formation in the Piedmont region of Maryland, Pennsylvania, and Delaware.[1]
- ^ Crowley, William P.; Cleaves, Emery T. (1974). Geologic map of the Towson Quadrangle, Maryland (Map). 1:24000. Maryland Geological Survey.