Silurian (undifferentiated) Formation

Operator-reported tops from 972 wells across 22 counties, median tops running 5,724–18,795 ft by county.

Top depth: 7,041 ft 16,635 ft

55 wells shown (sampled from 972)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Crane	155	5,724 ft	5,421–9,935	↓
Andrews	126	8,346 ft	7,980–12,518	↓
Winkler	99	8,350 ft	7,300–16,048	↓
Ector	94	8,343 ft	7,243–11,218	↓
Crockett	84	8,281 ft	5,167–9,434	↓
Pecos	74	7,164 ft	5,566–18,090	↓
Upton	58	11,399 ft	8,266–12,165	↓
Martin	36	11,776 ft	11,056–12,142	↓
Ward	35	14,050 ft	7,650–17,097	↓
Howard	32	10,091 ft	9,850–10,386	↓
Yoakum	25	11,891 ft	9,496–13,125	↓
Midland	25	12,280 ft	11,653–12,446	↓
Terrell	25	12,397 ft	9,268–12,869	↓
Reagan	21	10,032 ft	9,323–10,231	↓
Reeves	18	14,013 ft	11,816–18,004	↓
Gaines	15	12,272 ft	10,898–13,429	↓
Glasscock	14	10,280 ft	9,786–11,043	↓
Dawson	12	12,056 ft	11,481–12,263	↓
Culberson	6	14,093 ft	13,472–14,842	↓
Irion	6	9,169 ft	9,088–9,222	↓
Terry	6	13,192 ft	12,625–13,336	↓
Loving	6	18,795 ft	17,360–19,711	↓

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.