Permian (undifferentiated) Formation

Operator-reported tops from 2,614 wells across 24 counties, median tops running 220–7,800 ft by county.

Top depth: 800 ft 11,300 ft

1,329 wells shown (sampled from 2,614)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Reeves	1,538	2,730 ft	813–11,300	↓
Andrews	361	7,800 ft	7,187–7,900	↓
Wichita	161	480 ft	241–919	↓
Crane	126	3,900 ft	700–7,297	↓
Throckmorton	65	1,115 ft	712–1,930	↓
Sherman	64	540 ft	463–585	↓
Montague	42	820 ft	451–1,247	↓
Young	37	220 ft	142–881	↓
Pecos	30	4,553 ft	1,187–5,251	↓
Hardeman	29	3,310 ft	2,437–3,310	↓
Crockett	28	1,092 ft	550–3,077	↓
Moore	24	550 ft	488–629	↓
Terrell	19	1,020 ft	694–1,356	↓
Reagan	13	2,502 ft	661–2,793	↓
Ector	11	7,675 ft	7,553–7,935	↓
Winkler	10	7,325 ft	7,284–8,347	↓
Archer	10	543 ft	441–1,208	↓
Schleicher	9	710 ft	453–1,613	↓
Val Verde	8	867 ft	804–933	↓
Gray	7	500 ft	468–541	↓
Mitchell	6	560 ft	190–710	↓
Irion	6	4,100 ft	328–6,689	↓
Edwards	5	1,240 ft	1,024–2,335	↓
Potter	5	250 ft	63–4,364	↓

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.