Cahill 1 Gustafson
API 4005305000 · Gregory County, South Dakota · Wildcat field
Plugged and AbandonedDry Hole
API
4005305000
Operator
W. Cahill
County
Gregory
Field
Wildcat
Location
SWNW Sec 23 Twp 097N Rng 73W
Permit
372
Formation tops
South Dakota records 9 formations for this well, shallowest first.
| Formation | Top (ft) | Age |
|---|---|---|
| Pierre Shale | 20 | Cretaceous |
| Niobrara Formation | 800 | Cretaceous |
| Carlile Shale | 1,000 | Cretaceous |
| Greenhorn Limestone | 1,190 | Cretaceous |
| Graneros | 1,280 | Cretaceous |
| Newcastle Sandstone | 1,390 | Cretaceous |
| Fall River Sandstone | 1,530 | Cretaceous |
| Minnelusa Formation | 2,055 | Permian/Pennsylvanian |
| Red River Formation | 2,180 | Ordovician |
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
1964-10-13
Measured depth
2,205 ft
True vertical depth
2,205 ft
Location
43.206852, -99.453009
43.20685, -99.45301 · Surface location as filed with South Dakota⌘ or Ctrl + scroll to zoom
Every well in Gregory County, South Dakota
South Dakota state record, from SD_wells_SDOILexport_Export__wells_Table_4_Web.parquet. Corpus built 2026-09-11.