Richfield 1 State A
API 4006305008 · Harding County, South Dakota · Wildcat field
Plugged and AbandonedDry Hole
API
4006305008
Operator
Richfield Oil Corp.
County
Harding
Field
Wildcat
Location
Permit
120
Formation tops
South Dakota records 24 formations for this well, shallowest first.
| Formation | Top (ft) | Age |
|---|---|---|
| Pierre Shale | 344 | Cretaceous |
| Niobrara Formation | 2,493 | Cretaceous |
| Greenhorn Limestone | 2,992 | Cretaceous |
| Newcastle Sandstone | 3,659 | Cretaceous |
| Skull Creek Shale | 3,751 | Cretaceous |
| Fall River Sandstone | 4,007 | Cretaceous |
| Lakota Formation | 4,078 | Cretaceous |
| Morrison Formation | 4,157 | Jurassic |
| Sundance Formation | 4,370 | Triassic |
| Piper Formation | 4,626 | Triassic |
| Spearfish Formation | 4,840 | Triassic/Permian |
| Minnekahta Limestone | 5,411 | Permian |
| Opeche Shale | 5,459 | Permian |
| Minnelusa Formation | 5,532 | Permian/Pennsylvanian |
| Charles Formation | 6,001 | Mississippian |
| Mission Canyon Limestone | 6,361 | Mississippian |
| Lodgepole Limestone | 6,720 | Mississippian |
| Englewood Limestone | 7,140 | Mississippian/Devonian |
| Duperow Formation | 7,170 | Devonian |
| Interlake Dolomite | 7,270 | Silurian |
| Gunton Member, Stony Mountain Formation | 7,430 | Ordovician |
| Stony Mountain Formation | 7,478 | Ordovician |
| Red River Formation | 7,539 | Ordovician |
| Winnipeg Formation | 8,030 | 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
1955-02-09
Measured depth
8,236 ft
True vertical depth
8,236 ft
Location
45.437784, -103.641584
45.43778, -103.64158 · 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.