Pennsylvanian Formation

Operator-reported tops from 6,478 wells across 70 counties, median tops running 365–14,900 ft by county.

Top depth: 1,980 ft 12,764 ft

559 wells shown (sampled from 6,478)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Crockett	615	7,802 ft	7,535–8,131	↓
Andrews	532	8,892 ft	8,697–9,103	↓
Hemphill	459	6,252 ft	5,537–10,380	↓
Martin	405	9,910 ft	9,191–10,600	↓
Upton	404	10,315 ft	9,132–11,085	↓
Howard	289	8,831 ft	7,376–9,108	↓
Ward	279	8,014 ft	2,529–8,348	↓
Lipscomb	248	5,030 ft	4,846–5,296	↓
Wheeler	248	6,495 ft	6,306–7,980	↓
Roberts	242	4,727 ft	4,432–5,117	↓
Midland	202	10,424 ft	10,006–10,737	↓
Crane	157	7,276 ft	6,892–8,088	↓
Ector	153	8,865 ft	7,762–10,404	↓
Glasscock	148	8,580 ft	8,178–9,643	↓
Roberts	136	5,450 ft	4,647–6,025	↓
Dawson	131	9,075 ft	8,336–10,229	↓
Hansford	125	4,162 ft	4,004–4,362	↓
Winkler	117	8,190 ft	7,752–8,567	↓
Reeves	113	11,000 ft	9,096–13,734	↓
Pecos	81	8,366 ft	5,992–15,249	↓
Cooke	80	1,670 ft	743–7,745	↓
Gaines	79	9,310 ft	9,002–10,302	↓
Sterling	71	7,592 ft	4,890–8,023	↓
Yoakum	70	9,764 ft	8,832–10,908	↓
Kent	66	6,450 ft	5,020–6,760	↓
Hartley	64	5,468 ft	4,760–6,610	↓
Borden	61	7,514 ft	6,724–8,690	↓
Terrell	59	10,873 ft	10,203–11,417	↓
King	54	5,286 ft	5,199–5,402	↓
Edwards	51	6,674 ft	2,703–8,954	↓
Loving	50	14,900 ft	14,072–15,164	↓
Scurry	46	6,653 ft	4,816–7,008	↓
Grayson	42	8,049 ft	5,924–10,532	↓
Nolan	38	5,708 ft	4,363–6,446	↓
Sherman	37	3,889 ft	3,051–4,275	↓
Terry	36	9,763 ft	9,378–10,595	↓
Coke	35	4,978 ft	3,862–5,741	↓
Potter	33	5,580 ft	4,700–6,799	↓
Wichita	32	594 ft	374–1,405	↓
Hutchinson	32	4,310 ft	3,716–4,622	↓
Sutton	29	5,065 ft	4,200–8,298	↓
Oldham	28	6,565 ft	5,002–7,131	↓
Reagan	23	9,771 ft	8,163–10,602	↓
Garza	22	7,710 ft	6,980–7,831	↓
Palo Pinto	19	3,515 ft	3,485–4,080	↓
Schleicher	18	4,505 ft	2,565–7,906	↓
Montague	17	6,177 ft	780–6,497	↓
Mitchell	15	7,394 ft	6,814–7,927	↓
Lynn	14	9,381 ft	8,328–9,666	↓
Motley	13	4,299 ft	4,026–5,110	↓
Johnson	12	5,600 ft	5,300–6,046	↓
Hudspeth	12	5,189 ft	1,730–5,362	↓
Wilbarger	10	5,924 ft	5,365–6,192	↓
Hockley	10	9,296 ft	9,178–9,811	↓
Young	9	1,400 ft	1–4,695	↓
Irion	9	7,142 ft	5,555–8,808	↓
Parker	9	5,770 ft	3,906–6,274	↓
Stephens	9	2,016 ft	838–3,890	↓
Tarrant	9	5,670 ft	1,984–6,794	↓
Hardeman	8	7,300 ft	3,472–7,606	↓
Floyd	8	7,877 ft	6,022–9,378	↓
Val Verde	7	3,430 ft	3,325–11,633	↓
Dickens	7	5,017 ft	4,997–5,051	↓
Cochran	7	8,181 ft	8,164–9,634	↓
Tom Green	7	3,850 ft	3,700–5,036	↓
Fisher	6	4,802 ft	3,913–5,180	↓
Young	6	365 ft	155–3,103	↓
Culberson	5	9,200 ft	6,124–10,512	↓
Childress	5	4,186 ft	4,127–4,209	↓
Coleman	5	381 ft	366–388	↓

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.