Marble Falls Formation

Operator-reported tops from 20,461 wells across 32 counties, median tops running 388–8,363 ft by county.

Top depth: 3,520 ft 8,363 ft

550 wells shown (sampled from 20,461)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Tarrant	2,774	6,694 ft	6,328–7,187	↓
Tarrant	2,393	7,011 ft	5,903–7,643	↓
Denton	2,341	7,225 ft	6,835–7,631	↓
Wise	2,259	6,717 ft	6,130–7,120	↓
Parker	1,535	6,122 ft	4,941–6,503	↓
Jack	1,511	5,116 ft	4,709–5,700	↓
Stephens	1,166	4,174 ft	3,508–4,705	↓
Eastland	1,019	3,280 ft	2,898–3,504	↓
Montague	879	6,608 ft	6,130–7,156	↓
Hood	771	5,190 ft	4,618–5,643	↓
Young	747	4,340 ft	4,038–4,782	↓
Brown	733	2,260 ft	1,118–2,810	↓
Stephens	406	3,791 ft	3,428–4,150	↓
Erath	370	4,124 ft	3,237–4,625	↓
Cooke	344	7,046 ft	6,464–7,420	↓
Coleman	209	2,350 ft	2,074–3,147	↓
Erath	194	2,717 ft	2,480–2,889	↓
Hill	192	7,761 ft	6,711–8,248	↓
Somervell	129	4,952 ft	4,739–5,495	↓
Throckmorton	90	4,458 ft	4,264–4,738	↓
Clay	88	5,874 ft	5,587–6,089	↓
Callahan	63	3,734 ft	3,314–4,145	↓
Shackelford	57	4,028 ft	3,687–4,434	↓
Archer	44	4,988 ft	4,847–5,384	↓
Dallas	33	8,363 ft	8,363–8,922	↓
Ellis	30	7,968 ft	7,668–8,160	↓
Bosque	25	5,469 ft	4,868–6,114	↓
Mcculloch	24	1,122 ft	805–1,324	↓
Hamilton	15	3,180 ft	2,246–3,578	↓
Edwards	7	4,597 ft	4,296–7,721	↓
Mills	7	2,054 ft	1,018–2,532	↓
San Saba	6	388 ft	372–410	↓

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.