Petrora

FORMATIONS · RRC WELLBORE FILE

Marmaton

Reported as a top in 1,695 wells across 12 counties, at a median depth of 7,184 ft (5,875 to 11,288 ft in most wells). 17 of those wells were permitted in the last three years.

A well counts if any of its completion filings report this formation, whether it produces from it or drilled through it. Depths are measured depth as filed; typo depths exist, which is why ranges are percentiles, not extremes. About completion reports →

1.7K
wells reporting a top
17
permitted in last 3 years
12
counties
7,184
median top, ft

COMPUTED OCT 29, 2026 · REBUILT DAILY

Depth by county

Counties with at least five wells reporting the top. Bars are well counts.

CountyWellsMedian, ftP10–P90Last 3 yrs
Ochiltree
598
6,8266,352–7,4466
Wheeler
263
11,76910,805–12,2742
Lipscomb
182
7,6557,205–8,5216
Hansford
168
6,1425,797–6,5190
Hemphill
157
9,4298,915–10,4562
Roberts
137
8,6006,990–9,0260
Sherman
133
5,4004,831–5,5341
Hutchinson
53
5,9805,474–6,3800

Operators

Current operator of record for wells reporting the top, ranked by wells permitted in the last three years.

OperatorLast 3 yrsAll
Unit Petroleum Company3141
Duncan Oil Properties, Inc.36
Mewbourne Oil Company2182
Sanguine Gas Exploration, LLC276
Courson Oil & Gas, Inc.129
Scout Energy Management LLC15
SGP Operating LLC14
H & L Exploration Company, LLC13
Citation Oil & Gas Corp.12
Texakoma E & P, LLC12
J-Brex Company11
Phillips Petroleum Company0136
Linn Operating, Inc.090
Newfield Expl. Mid-Con. Inc070
Strat Land Exploration Company062
Texas American Resources Company039
Chesapeake Operating, Inc.035
Holmes Exploration, LLC030
Latigo Petroleum Texas, LP024
Jones Energy, Ltd.023
EOG Resources, Inc.023
Apache Corporation022
TXO Production Corp.021
Chaparral Energy, L.L.C.021
Alpar Resources, Inc.021

Recently permitted wells reporting the Marmaton

BY LAST PERMIT ISSUED

Last permitLeaseOperatorCountyTop, ftAPI
Nov 12, 2025R.D. MillsSanguine Gas Exploration, LLCWheeler10,95648333051
Oct 13, 2025Farnsworth UnitCitation Oil & Gas Corp.Ochiltree6,56035702381
Sep 5, 2025Peterson JJ-Brex CompanyOchiltree6,96435733760
Aug 15, 2025StarDuncan Oil Properties, Inc.Lipscomb7,58429534425
Apr 3, 2025Michelle-Jones 91/86 AMewbourne Oil CompanyLipscomb8,93129534421
Oct 2, 2024Coldwater Ranch UnitScout Energy Management LLCSherman5,40842130328
Sep 17, 2024DeuceDuncan Oil Properties, Inc.Lipscomb7,99129534417
Sep 17, 2024Mildred M. Hutchinson et ALH & L Exploration Company, LLCOchiltree7,79235731718
Aug 23, 2024Isaacs EUnit Petroleum CompanyHemphill8,94221134295
Jul 26, 2024Vollmert 'C'Unit Petroleum CompanyHemphill8,98521134301
Jun 26, 2024Jines 660Courson Oil & Gas, Inc.Ochiltree7,15535733768
Jun 18, 2024Frass 21SGP Operating LLCLipscomb6,90029534367
Apr 25, 2024Fritzlen-William 179/174 AMewbourne Oil CompanyLipscomb8,87829534414
Mar 12, 2024Clem 'A'Unit Petroleum CompanyOchiltree8,25035732690
Jan 30, 2024BozemanTexakoma E & P, LLCOchiltree6,63435733763
Jan 19, 2024DougSanguine Gas Exploration, LLCWheeler11,17048332852
Dec 7, 2023Booth GDuncan Oil Properties, Inc.Lipscomb7,95729534410
Oct 3, 2023DeuceDuncan Oil Properties, Inc.Lipscomb7,99729534409
Aug 29, 2023Logan Roy 695-714Revolution Operating Company,llcLipscomb7,89929534406
Aug 25, 2023Mills RanchSanguine Gas Exploration, LLCWheeler11,17048332501
Jun 5, 2023LovellaDuncan Oil Properties, Inc.Lipscomb8,04229534402
May 22, 2023The Quiet Man 105/107Upland Exploration, LLCLipscomb8,21129534400
May 5, 2023Kathryn 'A'Scout Energy Management LLCSherman5,32242130302
Apr 18, 2023Coble 496Revolution Operating Company,llcHutchinson6,52023332966
Dec 22, 2022AlexanderAmarillo Exploration, Inc.Hansford5,76019531949

About this data

Formation tops, elevations, perforations, and casing from the RRC dbf900 wellbore file, refreshed weekly, with reported names normalized to Petrora's formation registry. County and operator breakdowns are rebuilt nightly.

Developers: this page as JSON is GET /v1/data/formations/marmaton, documented in the API reference.