Dean Formation

Operator-reported tops from 30,158 wells across 28 counties, median tops running 4,482–10,904 ft by county.

Top depth: 6,178 ft 9,354 ft

6,448 wells shown (sampled from 30,158)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Midland	7,174	8,842 ft	8,132–9,480	↓
Upton	4,613	7,504 ft	6,676–8,163	↓
Midland	4,109	8,900 ft	8,438–9,309	↓
Upton	3,266	8,630 ft	8,053–9,020	↓
Howard	3,154	7,420 ft	6,322–7,905	↓
Glasscock	1,766	8,025 ft	6,995–8,319	↓
Irion	1,486	6,061 ft	4,909–6,391	↓
Crockett	1,238	5,176 ft	4,427–6,087	↓
Andrews	642	9,612 ft	9,394–9,735	↓
Dawson	597	8,500 ft	8,149–9,304	↓
Ector	518	9,055 ft	8,906–9,347	↓
Borden	451	6,464 ft	5,792–7,761	↓
Tom Green	434	6,045 ft	5,630–6,356	↓
Tom Green	265	5,956 ft	5,554–6,326	↓
Schleicher	102	4,482 ft	3,592–5,151	↓
Garza	98	9,560 ft	8,703–9,768	↓
Terry	73	8,984 ft	8,524–9,670	↓
Garza	46	6,273 ft	5,731–6,835	↓
Reeves	28	9,649 ft	9,038–9,829	↓
Mitchell	26	5,130 ft	5,070–5,336	↓
Yoakum	10	9,439 ft	9,149–9,680	↓
Hockley	10	7,620 ft	7,159–8,420	↓
Lynn	10	7,344 ft	7,307–7,737	↓
Scurry	9	4,920 ft	4,385–5,376	↓
Culberson	9	8,427 ft	7,900–8,668	↓
Crane	9	8,393 ft	7,896–8,687	↓
Montgomery	8	10,904 ft	10,833–11,377	↓
Loving	7	9,905 ft	9,299–11,142	↓

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.