| Rock Unit | Depth, Feet |
|---|---|
| Surficial Deposits and/or Gubik Formation | 16 |
| Shale of the Colville Group | 80 |
| Nanushuk Group | 295 |
| Torok Formation | 2690 |
| Pebble Shale Unit | 6365 |
| Kingak Shale | 6580 |
| Sag River Sandstone | 6760 |
| Shublik Formation | 7025 |
| Ledge Sandstone Member of the Ivishak Formation. Sadlerochit Group | 7455 |
| Basement Complex | 7590 |
Data Source:
Table 15.3. - Total depth and depths to selected stratigraphic horizons
for Government-drilled wells on the North Slope of Alaska., in:
Gryc, George, Ed., 1988, Geology and exploration of the National Petroleum
Reserve in Alaska, 1974 to 1982, U.S. Geological Survey Professional
Paper 1399, Pgs.322 - 324.
