Dept. of the Interior
U.S. Geological Survey
Energy Resources Team

Selected Data from Eleven Wildcat Wells in 
the National Petroleum Reserve in Alaska

USGS Open File Report 99-015


Depths to Selected Stratigraphic Horizons

WELL NAME       ROCK UNIT                                                                 DEPTH, FEET
J.W. DALTON 1   Surficial Deposits and/or Gubik Formation                                 18.00                 
J.W. DALTON 1   Sandstone of the Colville Group and Sagavanirktok Formation               210.00                
J.W. DALTON 1   Shale of the Colville Group                                               2060.00               
J.W. DALTON 1   Nanushuk Group                                                            2660.00               
J.W. DALTON 1   Torok Formation                                                           4140.00               
J.W. DALTON 1   Pebble Shale Unit                                                         7480.00               
J.W. DALTON 1   Shublik Formation                                                         7640.00               
J.W. DALTON 1   Fire Creek Siltstone Member of the Ivishak Formation, Sadlerochit Group   7900.00               
J.W. DALTON 1   Ledge Sandstone Member of the Ivishak Formation. Sadlerochit Group        7955.00               
J.W. DALTON 1   Kavik Member of the Ivishak Formation, Sadlerochit Group                  8230.00               
J.W. DALTON 1   Lisburne Group                                                            8305.00               
J.W. DALTON 1   Endicott Group                                                            8615.00               
J.W. DALTON 1   Basement Complex                                                          9265.00               

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.