Jo Mill Formation

Operator-reported tops from 1,893 wells across 13 counties, median tops running 5,292–8,914 ft by county.

Top depth: 5,854 ft 8,872 ft

485 wells shown (sampled from 1,893)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Reagan	634	6,640 ft	6,108–7,253	↓
Martin	476	8,391 ft	7,619–9,106	↓
Upton	240	8,379 ft	8,094–8,538	↓
Midland	187	8,508 ft	8,047–8,852	↓
Irion	85	5,954 ft	5,652–6,041	↓
Dawson	67	7,653 ft	7,390–8,254	↓
Borden	56	7,200 ft	6,723–7,359	↓
Glasscock	50	7,684 ft	7,303–7,755	↓
Howard	44	7,220 ft	6,360–7,586	↓
Andrews	28	8,914 ft	8,878–9,249	↓
Crockett	15	5,292 ft	5,287–5,540	↓
Garza	6	6,062 ft	5,976–6,205	↓
Lynn	5	7,668 ft	7,624–7,687	↓

Counties with fewer than 5 wells omitted. Depths are measured depth as filed; typical range is the 10th–90th percentile of reported tops — raw filings contain occasional typo depths, so extremes are not shown.