Cook Mountain Formation

Operator-reported tops from 2,004 wells across 28 counties, median tops running 1,278–11,000 ft by county.

Top depth: 748 ft 5,852 ft

766 wells shown (sampled from 2,004)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Live Oak	681	2,600 ft	1,999–4,307	↓
Webb	282	3,970 ft	547–3,970	↓
De Witt	133	3,280 ft	2,700–4,057	↓
Goliad	105	5,115 ft	4,866–5,574	↓
Wharton	94	7,988 ft	7,502–11,468	↓
Liberty	82	11,000 ft	7,195–13,953	↓
Zapata	75	2,900 ft	1,545–3,775	↓
Fort Bend	70	8,435 ft	7,743–9,063	↓
Duval	62	4,830 ft	4,450–5,330	↓
Jim Hogg	57	4,850 ft	4,700–5,233	↓
Starr	51	3,385 ft	2,132–7,803	↓
Harris	45	8,200 ft	7,467–9,509	↓
Mcmullen	44	1,922 ft	1,290–2,080	↓
Karnes	39	2,479 ft	1,960–4,608	↓
Hardin	26	8,682 ft	7,082–9,690	↓
Atascosa	17	1,278 ft	1,248–1,542	↓
Colorado	16	6,000 ft	4,908–7,181	↓
Grimes	16	2,464 ft	102–4,075	↓
Polk	15	6,266 ft	5,698–6,361	↓
Lavaca	13	6,282 ft	2,768–6,838	↓
Waller	13	7,576 ft	5,179–7,901	↓
Jackson	12	8,902 ft	7,063–10,449	↓
Bee	12	4,698 ft	3,118–5,509	↓
Austin	11	5,158 ft	4,360–7,754	↓
Montgomery	10	6,562 ft	6,175–6,790	↓
Jim Wells	9	8,893 ft	7,132–8,960	↓
Jasper	8	7,540 ft	7,306–8,174	↓
Tyler	6	6,367 ft	4,466–6,388	↓

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.