Jackson Formation

Operator-reported tops from 2,949 wells across 41 counties, median tops running 330–11,800 ft by county.

Top depth: 609 ft 5,427 ft

947 wells shown (sampled from 2,949)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Live Oak	704	1,436 ft	776–2,846	↓
Duval	319	2,155 ft	1,300–5,300	↓
Webb	260	690 ft	690–1,583	↓
Wharton	157	5,790 ft	5,100–7,132	↓
Polk	118	3,578 ft	2,780–4,777	↓
Jim Hogg	112	2,770 ft	2,002–4,197	↓
Bee	105	3,060 ft	1,936–4,624	↓
Refugio	98	2,695 ft	1,983–5,021	↓
Liberty	80	6,342 ft	3,710–9,725	↓
Jim Wells	71	5,687 ft	4,800–9,500	↓
Austin	71	3,148 ft	2,986–3,438	↓
Harris	69	6,587 ft	4,364–9,014	↓
Hardin	67	5,330 ft	2,560–8,030	↓
Jackson	64	5,925 ft	4,990–6,286	↓
Starr	62	2,651 ft	323–9,794	↓
Zapata	55	330 ft	140–1,805	↓
Goliad	50	3,800 ft	3,435–4,728	↓
Lavaca	40	3,920 ft	2,040–4,365	↓
Jasper	36	5,302 ft	4,520–8,474	↓
Colorado	33	4,682 ft	2,691–5,220	↓
Kleberg	32	11,285 ft	11,285–12,966	↓
Fort Bend	32	6,476 ft	5,775–7,476	↓
Montgomery	30	3,764 ft	3,250–4,113	↓
San Jacinto	29	3,100 ft	1,160–3,742	↓
Jefferson	28	9,600 ft	8,285–10,430	↓
Hidalgo	28	11,800 ft	11,356–15,665	↓
De Witt	27	3,747 ft	3,173–4,556	↓
Mcmullen	24	1,882 ft	1,476–2,900	↓
Walker	22	2,760 ft	1,673–3,012	↓
Newton	22	5,436 ft	5,366–5,594	↓
Grimes	17	2,495 ft	1,541–3,554	↓
Brooks	15	10,208 ft	6,158–15,328	↓
Victoria	14	4,905 ft	4,030–6,138	↓
Tyler	11	4,220 ft	4,086–6,048	↓
Nueces	9	10,648 ft	8,725–12,720	↓
Karnes	9	2,965 ft	2,466–3,356	↓
Orange	6	9,642 ft	8,505–10,240	↓
Chambers	6	5,068 ft	4,942–10,825	↓
Washington	6	979 ft	430–2,280	↓
Waller	6	3,450 ft	2,921–5,110	↓
Calhoun	5	8,810 ft	8,220–9,530	↓

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.