UNDERWOOD 'A' 1
API 15175204000000 · Seward County, Kansas · ARCHER field
Recompleted
API
15175204000000
Operator
Anadarko Petroleum Corporation
County
Seward
Field
ARCHER
Location
Spudded
1979-04-04
Completed
1979-08-23
Measured depth
6,670 ft
Formation tops
Kansas records 74 formations for this well, shallowest first.
| Formation | Top (ft) | Base (ft) | Picks |
|---|---|---|---|
| Stone Corral Formation | — | 1,665 | 1 |
| Wellington Formation | 2,202 | — | 1 |
| Hutchinson Salt Member | 2,348 | — | 1 |
| Hollenberg Limestone Member | 2,630 | — | 1 |
| Chase Group | 2,666 | — | 1 |
| Herington Limestone Member | 2,666 | — | 1 |
| Paddock Shale Member | 2,686 | — | 1 |
| Krider Limestone Member | 2,696 | — | 1 |
| Odell Shale Formation | 2,736 | — | 1 |
| Winfield Limestone Formation | 2,746 | — | 1 |
| Gage Shale Member | 2,789 | — | 1 |
| Towanda Limestone Member | 2,803 | 2,856 | 1 |
| Fort Riley Limestone Member | 2,861 | 2,919 | 1 |
| Florence Limestone Member | 2,920 | — | 1 |
| Matfield Shale Formation | 2,947 | — | 1 |
| Wreford Limestone Formation | 2,960 | — | 1 |
| Council Grove Group | 2,982 | — | 1 |
| Speiser Shale Formation | 2,982 | — | 1 |
| Funston Formation | 3,003 | — | 1 |
| Blue Rapids Shale Formation | 3,060 | — | 1 |
| Crouse Limestone Formation | 3,070 | — | 1 |
| Easly Creek Shale Formation | 3,091 | — | 1 |
| Middleburg Limestone Member | 3,102 | — | 1 |
| Hooser Shale Member | 3,122 | — | 1 |
| Eiss Limestone Member | 3,135 | — | 1 |
| Stearns Shale Formation | 3,149 | — | 1 |
| Morrill Limestone Member | 3,156 | — | 1 |
| Florena Shale Member | 3,178 | — | 1 |
| Cottonwood Limestone Member | 3,190 | — | 1 |
| Eskridge Shale Formation | 3,230 | — | 1 |
| Neva Limestone Member | 3,270 | — | 1 |
| Roca Shale Formation | 3,333 | — | 1 |
| Howe Limestone Member | 3,360 | — | 1 |
| Johnson Shale Formation | 3,388 | — | 1 |
| Long Creek Limestone Member | 3,402 | — | 1 |
| Janesville Shale Formation | 3,444 | — | 1 |
| Wabaunsee Group | 3,466–3,569 | — | 3 |
| Root Shale Formation | 3,595 | — | 1 |
| Stotler Limestone Formation | 3,634 | — | 1 |
| Severy Shale Formation | 3,858 | — | 1 |
| Shawnee Group | 3,902 | — | 1 |
| Topeka Limestone Formation | 3,902 | — | 1 |
| Heebner Shale Member | 4,298 | — | 1 |
| Toronto Limestone Member | 4,315 | — | 1 |
| Iatan Limestone Member | 4,364 | — | 1 |
| Lansing Group | 4,430 | — | 2 |
| Muncie Creek Shale Member | 4,665 | — | 1 |
| B/DRUM | — | 4,706 | 1 |
| Cherryvale Shale Formation | 4,772 | — | 1 |
| Dennis Limestone Formation | 4,792 | — | 1 |
| Stark Shale Member | 4,962 | — | 1 |
| Swope Limestone Formation | 4,989 | — | 1 |
| Hushpuckney Shale Member | 5,024 | — | 1 |
| Hertha Limestone Formation | 5,039 | — | 1 |
| Marmaton Group | 5,121 | — | 1 |
| Altamont Limestone Formation | 5,170 | — | 1 |
| Pawnee Limestone Formation | 5,248 | — | 1 |
| Fort Scott Limestone Formation | 5,298 | — | 1 |
| Little Osage Shale Member | 5,366 | — | 1 |
| Cherokee Group | 5,428 | — | 1 |
| Excello Shale Member | 5,428 | — | 1 |
| Verdigris Limestone Member | 5,536 | — | 1 |
| Atoka Shale Bed | 5,658 | — | 1 |
| Middle Morrowan Limestone Bed | 5,803–6,053 | — | 2 |
| Upper Kearny Member | 5,803 | — | 1 |
| Chesteran Stage | 6,095 | — | 1 |
| Chesteran Zone C Bed | 6,095 | 6,176 | 1 |
| Mississippian System | 6,095 | — | 1 |
| Chesteran Zone B Bed | 6,176 | 6,276 | 1 |
| Chesteran Zone A Bed | 6,276 | 6,472 | 2 |
| Meramecian Stage | 6,472 | — | 1 |
| Ste. Genevieve Limestone Formation | 6,472 | — | 1 |
| St. Louis Limestone Formation | 6,565 | — | 1 |
| Lower Kearny Member | — | — | 1 |
A dash is a formation Kansas records for this well without a depth. In the base column a dash is also a depth Kansas’s sources record differently from one another. 2 formations were picked at more than one depth by different Kansas sources, and their range is shown rather than one of the answers.
Location
37.070544, -100.991640
37.07054, -100.99164 · Surface location as filed with Kansas⌘ or Ctrl + scroll to zoom
Every well in Seward County, Kansas
Kansas state record, from KS_wells_ks_wells.parquet. Corpus built 2026-09-11.