Darker colors on the map indicate greater thickness of selected shale.
Gray = no known Marcellus
Yellow = 0-25ft.
Orange = 26-50ft.
Pink = 51-75ft.
Violet = 76-100ft.
Black = over 100ft.
- Credit: N/A
- Ownership: West Virginia Geological and Economic Survey
- Publication: N/A
- Editor: N/A
- Publisher: N/A
