Union Oil 1 USA 664
API 4006320017 · Harding County, South Dakota · Wildcat field
Plugged and AbandonedDry Hole
API
4006320017
Operator
Union Oil Co. of California
County
Harding
Field
Wildcat
Location
Permit
503
Formation tops
South Dakota records 7 formations for this well, shallowest first.
| Formation | Top (ft) | Age |
|---|---|---|
| Eagle Sandstone Member, Pierre Shale | 932 | Cretaceous |
| Greenhorn Limestone | 2,428 | Cretaceous |
| Mowry Shale | 3,068 | Cretaceous |
| Dakota Mud | 3,241 | Cretaceous |
| Skull Creek Shale | 3,284 | Cretaceous |
| Fall River Sandstone | 3,568 | Cretaceous |
| Morrison Formation | 3,722 | Jurassic |
A dash is a formation South Dakota records for this well without a depth.
Completion
South Dakota files 1 completion report for this well.
Vertical Well
Plugged and AbandonedDry HoleSpudded
1969-08-11
Measured depth
3,800 ft
True vertical depth
3,800 ft
Location
45.232898, -103.902233
45.23290, -103.90223 · Surface location as filed with South Dakota⌘ or Ctrl + scroll to zoom
Every well in Harding County, South Dakota
South Dakota state record, from SD_wells_SDOILexport_Export__wells_Table_4_Web.parquet. Corpus built 2026-09-11.