Investors 1 Cowan
API 4004120006 · Dewey County, South Dakota · Lantry field
Converted-Fresh Water SupplyDry Hole-Oil show
API
4004120006
Operator
Investors Drilling Ventures Inc.
County
Dewey
Field
Lantry
Location
SESE Sec 20 Twp 013N Rng 22E
Permit
567
Formation tops
South Dakota records 13 formations for this well, shallowest first.
| Formation | Top (ft) | Age |
|---|---|---|
| Niobrara Formation | 1,600 | Cretaceous |
| Greenhorn Limestone | 2,120 | Cretaceous |
| Dakota Mud | 2,640 | Cretaceous |
| Skull Creek Shale | 2,715 | Cretaceous |
| Fall River Sandstone | 2,880 | Cretaceous |
| Minnelusa Formation | 3,235 | Permian/Pennsylvanian |
| 3rd Leo Sandstone, Minnelusa Formation | 3,670 | Pennsylvanian |
| Mission Canyon Limestone | 3,995 | Mississippian |
| Three Forks Shale | 4,650 | Devonian |
| Duperow Formation | 4,715 | Devonian |
| Red River Formation | 4,976 | Ordovician |
| Winnipeg Formation | 5,525 | Ordovician |
| Deadwood Formation | 5,630 | Ordovician/Cambrian |
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
Converted-Fresh Water SupplyDry Hole-Oil showSpudded
1970-07-22
Measured depth
5,832 ft
True vertical depth
5,832 ft
Location
45.069059, -101.448091
45.06906, -101.44809 · Surface location as filed with South Dakota⌘ or Ctrl + scroll to zoom
Every well in Dewey County, South Dakota
South Dakota state record, from SD_wells_SDOILexport_Export__wells_Table_4_Web.parquet. Corpus built 2026-09-11.