Setters Formation
Jump to navigation
Jump to search
| Setters Formation | |
|---|---|
| Stratigraphic range: late Precambrian | |
| File:Setters Formation Marriottsville Road 20211231.jpg Outcrop of Setters Formation along Marriottsville Road, Baltimore County | |
| Type | metamorphic |
| Unit of | Glenarm Group |
| Underlies | Cockeysville Marble |
| Overlies | Baltimore Gneiss |
| Lithology | |
| Primary | Mica-schist |
| Other | Muscovite-gneiss and quartzite |
| Location | |
| Region | Piedmont of eastern North America |
| Country | United States |
| Extent | Maryland, Pennsylvania, Delaware |
The Setters Formation is a geological formation that is located in Maryland, Pennsylvania, and Delaware in the United States. The formation is metamorphic and consists of a complex suite of schist, gneiss, and quartzite.[1]
It is the lowest unit of the Glenarm Group (or Supergroup).[2] The overlying formations of the group are the Cockeysville Marble and the Wissahickon Formation.
Outcrops
[edit | edit source]Some outcrops listed by the USGS[2] are:
- Setters Ridge, which forms north front of Chattolanee anticline, Baltimore County, Maryland.
- Quarries in Avondale, Pennsylvania.
- Eastburn's quarry, New Castle County, Delaware.
Gallery
[edit | edit source]-
Setters Formation showing schist with tourmaline or hornblende crystals on the foliation plane
