| Cockeysville Marble | |
|---|---|
| Stratigraphic range: Precambrian, Cambrian, or Ordovician | |
 Polished slab of the marble from Cockeysville. Width of slab inside black border is approximately 10.7 cm. | |
| Type | metamorphic |
| Unit of | Glenarm Supergroup |
| Underlies | Wissahickon Formation |
| Overlies | Setters Formation |
| Thickness | about 750 feet[1] |
| Lithology | |
| Primary | marble |
| Location | |
| Region | Piedmont of Maryland |
| Type section | |
| Named for | Cockeysville, Maryland |
| Named by | Williams and Darton, 1892[2] |
The Cockeysville Marble is a Precambrian, Cambrian, or Ordovician marble formation in Baltimore, Carroll, Harford and Howard Counties, Maryland. It is described as a predominantly metadolomite, calc-schist, and calcite marble, with calc-gneiss and calc-silicate marble being widespread but minor.[1]
The extent of this formation was originally mapped in 1892[2] within Baltimore County.