Duffer Formation

Operator-reported tops from 2,579 wells across 15 counties, median tops running 2,905–5,257 ft by county.

Top depth: 2,888 ft 4,555 ft

27 wells shown (sampled from 2,579)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Stephens	892	3,980 ft	3,850–4,127	↓
Eastland	795	3,696 ft	3,265–3,876	↓
Brown	179	2,905 ft	2,196–3,180	↓
Callahan	137	3,852 ft	3,702–3,955	↓
Palo Pinto	109	3,659 ft	3,387–4,121	↓
Shackelford	103	3,975 ft	3,822–4,410	↓
Erath	85	3,814 ft	3,221–4,452	↓
Erath	65	2,934 ft	2,692–3,124	↓
Hood	57	4,686 ft	4,171–5,231	↓
Coleman	51	3,295 ft	2,542–3,367	↓
Parker	41	4,390 ft	4,036–5,500	↓
Johnson	30	5,257 ft	5,162–6,219	↓
Young	16	4,288 ft	4,068–4,685	↓
Throckmorton	14	4,402 ft	4,307–4,482	↓
Somervell	5	4,952 ft	4,927–5,400	↓

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.