Viola Formation

Operator-reported tops from 2,484 wells across 18 counties, median tops running 6,174–17,592 ft by county.

Top depth: 6,240 ft 10,660 ft

49 wells shown (sampled from 2,484)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Denton	1,011	8,577 ft	7,818–8,991	↓
Wise	517	7,860 ft	7,223–8,274	↓
Tarrant	402	7,381 ft	7,114–7,720	↓
Montague	195	7,374 ft	6,588–8,505	↓
Grayson	120	8,374 ft	7,604–11,771	↓
Cooke	102	8,705 ft	8,365–8,842	↓
Clay	22	6,174 ft	6,091–6,417	↓
Dallas	20	8,872 ft	8,872–8,877	↓
Johnson	17	8,386 ft	7,030–8,680	↓
Hemphill	12	17,592 ft	16,715–19,866	↓
Hutchinson	11	7,910 ft	7,625–9,350	↓
Wheeler	9	15,564 ft	11,723–21,754	↓
Ochiltree	9	10,406 ft	9,743–10,604	↓
Parker	9	6,628 ft	6,404–6,789	↓
Hansford	8	9,194 ft	7,994–9,617	↓
Ellis	8	8,952 ft	8,681–9,024	↓
Hill	6	8,365 ft	8,166–9,234	↓
Roberts	6	9,840 ft	9,840–10,778	↓

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.