Drook Formation
| Drook Formation | |
|---|---|
| Stratigraphic range: Ediacaran | |
| Type | Formation |
| Unit of | Conception Group |
| Sub-units | Clam Cove, Peter's River, Biscay, Cape English, Torbay, Bauline Line and Broad Cove River Members |
| Underlies | |
| Overlies | Gaskiers Formation |
| Thickness | 770 m (2,526 ft) |
| Lithology | |
| Primary | Siliceous Siltstone |
| Other | Sandstone, Tuff |
| Location | |
| Region | Newfoundland and Labrador |
| Country | Canada |
| Type section | |
| Named for | Drook |
| Named by | S.B. Misra |
| Year defined | 1971 |
 | |
The Drook Formation is a geologic formation in Newfoundland and Labrador. It preserves fossils dating back to the Ediacaran period which have been dated to 575.8 ± 0.5 million years ago, making them the oldest macroscopic complex fossils in Newfoundland until the discovery of fossils in the pre-Gaskiers glaciation Rocky Harbour Formation and underlying Mall Bay Formation.