FORMATIONS · RRC WELLBORE FILE

Texas formations

Formation tops as operators report them on completion filings, normalized to one name per formation. A well counts for every formation it reports, so this is the state's stratigraphic column, not a list of producing zones. Where tops come from →Draw a cross-section: tops for up to eight wells side by side →

#						Typical range, ft
1	San Andres	89,374	6,387	49	4,184	1,900–4,832
2	Yates	67,962	5,456	42	2,568	1,250–3,046
3	Wolfcamp	57,599	2,668	91	8,323	3,870–10,316
4	Spraberry	57,510	4,909	36	7,140	5,430–8,099
5	Clear Fork	56,000	5,038	62	5,596	2,690–6,959
6	Grayburg	48,974	4,888	36	3,957	2,014–4,504
7	Austin Chalk	44,225	2,705	87	8,474	3,560–12,201
8	Queen	40,458	4,090	48	3,394	1,489–4,065
9	Strawn	32,460	294	101	8,100	1,800–10,684
10	Eagle Ford	32,002	2,064	69	9,532	6,329–12,579
11	Wilcox	31,495	1,857	91	4,850	2,114–8,480
12	Dean	30,257	1,155	38	8,226	6,118–9,270
13	Glorieta	30,070	1,942	51	4,940	2,450–5,960
14	Rustler	26,855	2,624	40	1,504	748–2,214
15	Seven Rivers	26,150	2,644	33	2,716	1,201–3,300
16	Canyon	23,908	335	95	6,060	3,200–7,888
17	Barnett	22,701	143	77	7,049	5,435–7,975
18	Travis Peak	22,216	575	55	7,400	6,088–9,046
19	Olmos	21,693	1,408	25	5,304	1,378–8,810
20	Marble Falls	20,499	111	48	6,263	3,386–7,396
21	Pettit	20,428	613	44	7,211	5,738–8,798
22	Caddo	20,385	156	59	4,199	2,880–5,776
23	Frio	19,268	512	61	3,950	1,000–7,278
24	Santa Rosa	17,656	2,396	32	1,000	635–1,426
25	Atoka	16,020	100	93	6,796	4,135–11,249
26	Escondido	15,637	1,191	24	3,900	850–6,868
27	Anacacho	15,299	944	30	8,769	4,937–11,266
28	Cotton Valley	15,036	508	38	8,988	8,120–11,408
29	Yegua	14,977	728	55	2,890	920–6,850
30	Queen City	14,474	779	54	2,954	960–5,800
31	Cherry Canyon	13,940	1,815	11	5,386	3,434–6,083
32	Bone Spring	13,667	1,746	10	7,955	6,125–9,103
33	Delaware	12,750	1,361	10	4,470	2,500–5,146
34	Rodessa	11,740	520	48	6,607	5,020–8,204
35	Bell Canyon	11,281	1,496	8	4,571	3,022–5,206
36	Navarro	10,971	510	69	5,810	594–9,310
37	Carrizo	10,176	640	42	3,807	1,390–5,326
38	Cisco	10,064	227	88	3,560	500–8,061
39	Brown Dolomite	9,799	81	22	2,990	2,330–4,250
40	Tubb	9,336	155	45	6,040	3,120–7,159
41	Bossier	9,149	203	34	11,131	9,813–12,594
42	James Lime	8,989	228	43	6,970	5,492–8,907
43	Mississippian	8,812	42	97	8,108	4,415–11,138
44	Base Cretaceous (marker)	8,371	199	41	800	500–1,170
45	Pecan Gap	8,082	307	73	6,951	1,915–12,008
46	Catahoula	7,838	316	46	3,200	1,000–4,261
47	Ellenburger	7,528	81	110	6,666	3,976–11,929
48	Wichita-Albany	7,392	168	61	6,479	3,715–7,460
49	San Miguel	7,363	384	17	5,009	1,536–6,705
50	Vicksburg	7,306	218	48	5,105	1,367–9,372
51	Buda	7,279	67	72	6,196	2,232–9,776
52	Miocene (undifferentiated)	7,208	157	61	2,140	1–5,350
53	Reklaw	7,037	543	33	3,761	1,997–5,345
54	Gunsight	7,036	161	37	1,354	525–2,354
55	Glen Rose	7,026	413	67	4,647	3,190–8,571
56	Woodbine	6,852	185	54	4,582	3,040–8,725
57	Pennsylvanian	6,533	80	96	7,903	4,660–10,448
58	Coleman Junction	6,362	271	37	2,311	698–4,785
59	Palo Pinto	6,352	139	46	3,010	1,040–4,770
60	Midway	6,289	338	71	5,064	1,293–9,467
61	Paluxy	6,112	431	49	4,224	2,660–7,122
62	Granite Wash	5,925	17	37	8,417	2,456–11,808
63	Brushy Canyon	5,823	949	8	6,803	5,245–7,557
64	Devonian	5,404	66	37	9,950	6,185–12,240
65	Douglas	5,245	64	13	6,370	5,180–8,120
66	BMA	5,201	74	35	6,626	4,952–7,880
67	Cleveland	5,018	40	12	7,718	6,680–10,298
68	Taylor	5,004	114	80	9,664	2,351–11,432
69	Bend	4,996	21	57	5,735	4,057–10,589
70	Massive Anhydrite (marker)	4,400	75	39	6,344	4,714–8,007
71	Tonkawa	4,121	48	10	7,152	5,735–9,584
72	Tansill	4,108	101	26	2,300	1,961–2,887
73	Tannehill	3,753	61	28	1,521	490–3,787
74	San Angelo	3,605	180	29	2,515	1,010–3,845
75	Leonard	3,547	270	36	5,881	3,120–7,645
76	Castile	3,520	290	7	2,581	999–3,880
77	Nacatoch	3,494	258	42	1,550	800–2,979
78	Morrow	3,370	19	39	8,550	6,733–14,045
79	Red Cave	3,224	34	18	1,890	1,592–2,224
80	Sparta	2,998	109	43	2,350	590–3,579
81	Georgetown	2,991	49	65	7,645	2,492–10,340
82	Jackson	2,968	133	48	2,865	690–6,537
83	Forestburg	2,870	9	10	7,364	6,571–7,974
84	Holt	2,844	83	10	4,940	4,172–5,500
85	Fusselman	2,679	31	35	10,460	8,294–12,381
86	Permian (undifferentiated)	2,672	36	59	2,524	495–10,353
87	Saddle Creek	2,672	117	32	1,845	1,000–3,780
88	Edwards	2,625	27	63	8,048	2,207–13,401
89	Panhandle Lime	2,614	12	17	2,305	1,876–2,964
90	Lamar	2,600	355	12	4,716	2,393–5,145
91	Duffer	2,587	4	19	3,850	3,110–4,171
92	Woodford	2,513	22	48	10,615	7,956–12,441
93	Viola	2,504	4	28	8,080	7,179–8,891
94	Anahuac	2,210	50	41	4,622	4,100–6,730
95	Wills Point	2,207	0	4	9,950	8,656–12,297
96	Kansas City	2,161	28	10	7,003	6,013–9,700
97	Cook Mountain	2,038	111	40	3,820	1,972–8,160
98	Big Saline	2,036	1	24	4,584	3,376–7,114
99	Thomas Sand	2,033	30	11	1,228	885–1,624
100	Salado	1,999	191	28	1,485	653–2,178
101	Greta	1,947	45	15	4,450	3,610–5,102
102	Jo Mill	1,907	68	15	7,660	6,158–8,689
103	Blossom	1,752	116	25	2,186	1,880–3,175
104	Haynesville	1,731	165	30	11,584	10,070–13,843
105	Bryson	1,717	48	11	3,442	2,622–4,686
106	Marmaton	1,695	17	12	7,184	5,875–11,288
107	Sligo	1,676	31	40	6,167	5,640–7,925
108	Sub-Clarksville	1,634	63	28	5,806	3,792–8,931
109	Goodland	1,550	154	34	3,771	2,370–6,844
110	Cline	1,496	5	25	9,031	8,220–10,408
111	Oswego	1,471	5	8	10,126	6,655–11,312
112	Des Moines	1,422	7	21	9,451	6,394–12,406
113	Oakville	1,400	33	33	2,750	1,000–3,300
114	McKnight	1,336	76	10	3,187	2,957–4,154
115	White Dolomite	1,304	1	12	2,976	2,610–3,253
116	Moore County Lime	1,194	2	14	3,076	2,639–3,487
117	Lagarto	1,185	32	11	1,500	1–2,750
118	Del Rio	1,173	15	44	4,893	2,021–9,285
119	Silurian (undifferentiated)	978	16	24	9,199	5,586–12,944
120	Hood	967	0	12	5,574	4,846–6,685
121	Chester	964	5	33	8,395	6,784–11,191
122	Avalon	815	121	6	7,581	5,446–8,550
123	Smithwick	787	6	28	5,585	3,164–7,054
124	Red Bluff	763	117	3	3,900	1,000–6,039
125	Bartosh	722	21	9	3,520	2,798–4,951
126	Caprock	721	22	19	1,073	564–3,190
127	Simpson	717	8	41	9,299	6,441–13,642
128	Montoya	614	3	27	11,086	7,736–14,387
129	KMA	567	44	12	3,800	3,590–4,258
130	Abo	525	7	24	7,548	6,696–8,513
131	Toborg	432	2	2	400	100–515
132	McKee	348	8	9	8,612	5,399–10,681
133	Waddell	339	6	9	8,528	5,800–11,338
134	Weches	308	2	28	981	203–9,550
135	Smackover	291	6	27	11,325	8,572–13,080
136	Wolfe City	255	0	8	780	596–1,536
137	Kiamichi	236	1	26	5,487	2,879–10,233
138	Buckner	190	0	16	10,995	5,270–12,581
139	Capitan	152	23	7	3,482	2,804–4,806
140	Pearsall	152	18	18	9,330	6,295–11,590
141	Ozan	109	1	12	10,692	2,656–12,924
142	Goliad	50	2	14	555	1–1,873
143	Maness	40	0	12	3,862	3,600–10,233
144	Yeso	40	0	6	7,013	2,853–7,053
145	Walnut	37	0	7	4,312	399–4,892

145 OF 145 · ≥25 WELLS · P10–P90 DEPTHS · REBUILT DAILY, LAST OCT 29, 2026