Tonkawa Formation

Operator-reported tops from 4,114 wells across 8 counties, median tops running 4,873–9,690 ft by county.

Top depth: 5,365 ft 9,815 ft

308 wells shown (sampled from 4,114)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Lipscomb	1,350	6,606 ft	6,300–7,340	↓
Hemphill	999	8,131 ft	7,524–8,960	↓
Wheeler	689	9,690 ft	9,016–10,096	↓
Ochiltree	465	6,100 ft	5,502–6,804	↓
Roberts	362	7,031 ft	5,838–7,774	↓
Hansford	174	5,350 ft	5,137–5,596	↓
Sherman	38	4,873 ft	4,790–5,016	↓
Hutchinson	37	5,388 ft	5,023–5,766	↓

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.