Sub-Clarksville Formation

Operator-reported tops from 1,607 wells across 18 counties, median tops running 1,240–8,978 ft by county.

Top depth: 3,550 ft 9,153 ft

233 wells shown (sampled from 1,607)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Madison	384	8,355 ft	7,749–9,001	↓
Wood	338	4,390 ft	3,999–9,196	↓
Leon	225	6,394 ft	5,423–7,424	↓
Houston	125	8,403 ft	6,341–9,210	↓
Anderson	78	5,244 ft	4,201–6,037	↓
Camp	73	3,822 ft	3,772–3,870	↓
Grimes	65	8,978 ft	8,769–9,950	↓
Freestone	53	4,182 ft	3,620–4,958	↓
Cherokee	50	4,358 ft	3,973–5,102	↓
Hopkins	34	3,976 ft	3,892–4,034	↓
Titus	33	2,566 ft	2,124–3,066	↓
Franklin	33	2,904 ft	2,495–3,112	↓
Brazos	29	8,160 ft	7,899–9,025	↓
Navarro	25	3,265 ft	2,983–3,683	↓
Van Zandt	20	2,776 ft	2,642–3,898	↓
Morris	20	4,058 ft	3,946–4,128	↓
Smith	17	4,792 ft	4,677–5,013	↓
Red River	5	1,240 ft	802–1,262	↓

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.