Tansill Formation

Operator-reported tops from 4,093 wells across 21 counties, median tops running 788–3,082 ft by county.

Top depth: 1,263 ft 3,092 ft

407 wells shown (sampled from 4,093)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Ward	1,532	2,300 ft	2,300–2,300	↓
Winkler	671	2,300 ft	2,280–2,396	↓
Ector	452	2,699 ft	2,452–2,855	↓
Andrews	340	2,854 ft	2,648–2,935	↓
Yoakum	280	2,970 ft	2,734–3,097	↓
Scurry	148	788 ft	701–888	↓
Crane	133	1,402 ft	1,261–2,022	↓
Pecos	99	2,390 ft	733–2,670	↓
Yoakum	89	2,948 ft	2,800–3,210	↓
Hockley	73	2,669 ft	2,530–2,781	↓
Midland	57	2,620 ft	2,433–2,844	↓
Martin	50	2,206 ft	1,888–2,919	↓
Terry	37	3,082 ft	2,672–3,121	↓
Dawson	30	2,795 ft	2,458–2,888	↓
Upton	19	2,350 ft	1,448–2,927	↓
Howard	17	1,439 ft	1,108–1,670	↓
Glasscock	16	1,956 ft	1,800–2,036	↓
Reagan	15	1,602 ft	1,379–1,835	↓
Cochran	15	2,817 ft	2,799–2,957	↓
Borden	14	1,699 ft	1,630–1,763	↓
Garza	6	1,179 ft	1,017–2,600	↓

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.