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
EAST SIMPSON 1  Surficial Deposits and/or Gubik Formation                            16.00                 
EAST SIMPSON 1  Shale of the Colville Group                                          80.00                 
EAST SIMPSON 1  Nanushuk Group                                                       295.00                
EAST SIMPSON 1  Torok Formation                                                      2690.00               
EAST SIMPSON 1  Pebble Shale Unit                                                    6365.00               
EAST SIMPSON 1  Kingak Shale                                                         6580.00               
EAST SIMPSON 1  Sag River Sandstone                                                  6760.00               
EAST SIMPSON 1  Shublik Formation                                                    7025.00               
EAST SIMPSON 1  Ledge Sandstone Member of the Ivishak Formation. Sadlerochit Group   7455.00               
EAST SIMPSON 1  Basement Complex                                                     7590.00               

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.