Shadow Lake Formation
The Shadow Lake formation is a geological unit that crops out in Southern Ontario, Canada and northern Pennsylvania, United States. The shaly sections act as a caprock to petroleum reservoirs.
| Shadow Lake formation | |
|---|---|
| Stratigraphic range: Middle Ordovician | |
| Type | Geological formation |
| Unit of | Black River & Simcoe Groups |
| Underlies | Gull River Formation |
| Overlies | Grenville basement Loysburg Formation |
| Thickness | 0–10 m (0–33 ft) |
| Lithology | |
| Primary | Sandstone, conglomerate |
| Other | Siltstone, shale |
| Location | |
| Region | Ontario Pennsylvania |
| Country | Canada United States |
| Type section | |
| Named for | Shadow Lake |
| Named by | Liberty |
| Year defined | 1969 |
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