| Rock Unit | Depth, Feet |
|---|---|
| Surficial Deposits and/or Gubik Formation | 18 |
| Sandstone of the Colville Group and Sagavanirktok Formation | 210 |
| Shale of the Colville Group | 2060 |
| Nanushuk Group | 2660 |
| Torok Formation | 4140 |
| Pebble Shale Unit | 7480 |
| Shublik Formation | 7640 |
| Fire Creek Siltstone Member of the Ivishak Formation, Sadlerochit Group | 7900 |
| Ledge Sandstone Member of the Ivishak Formation. Sadlerochit Group | 7955 |
| Kavik Member of the Ivishak Formation, Sadlerochit Group | 8230 |
| Lisburne Group | 8305 |
| Endicott Group | 8615 |
| Basement Complex | 9265 |
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.