Sparta Formation

Operator-reported tops from 2,964 wells across 28 counties, median tops running 126–9,700 ft by county.

Top depth: 571 ft 3,283 ft

916 wells shown (sampled from 2,964)

Depth by County

County	Wells	Median Top	Typical Range	CSV
La Salle	1,304	1,120 ft	558–2,351	↓
Mcmullen	613	2,982 ft	2,302–3,268	↓
Brazos	193	2,840 ft	2,000–2,840	↓
De Witt	124	3,896 ft	3,380–4,532	↓
Nacogdoches	84	126 ft	30–209	↓
Polk	75	6,286 ft	5,830–7,067	↓
Webb	68	2,300 ft	1,671–3,703	↓
Fayette	60	1,135 ft	416–1,339	↓
Zapata	57	2,792 ft	1,367–4,664	↓
Karnes	56	2,922 ft	1,930–3,722	↓
Washington	53	1,111 ft	950–1,309	↓
Gonzales	47	1,168 ft	1,057–1,345	↓
Houston	45	1,300 ft	825–1,468	↓
Austin	28	5,811 ft	5,425–5,974	↓
Trinity	24	1,106 ft	725–1,500	↓
Madison	17	788 ft	680–1,059	↓
Duval	17	3,398 ft	3,072–5,373	↓
Atascosa	13	1,650 ft	167–2,871	↓
Colorado	13	5,558 ft	4,701–5,640	↓
Frio	13	420 ft	390–455	↓
Newton	11	9,700 ft	7,722–9,900	↓
Wilson	9	1,346 ft	1,337–1,363	↓
Milam	8	387 ft	363–396	↓
Dimmit	8	423 ft	414–464	↓
Waller	7	5,830 ft	5,640–6,878	↓
Angelina	6	1,192 ft	890–1,500	↓
Walker	6	2,080 ft	1,675–4,165	↓
Starr	5	2,700 ft	2,232–3,866	↓

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.