Interactive Stratigraphic Reference

Basin & Formation
Chart Library

Search, highlight, and compare oil & gas formations across regional stratigraphic charts. Select a basin below to get started.

Oklahoma
Oklahoma Stratigraphic Guide to Oil & Gas Reservoirs
Comprehensive chart covering formations from Pre-Cambrian through Permian across 6 regional provinces including the Anadarko Basin, Arkoma Basin, and Arbuckle Uplift.
197 formations 6 regions Pre-Cambrian → Permian
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Texas — Permian Basin
Permian Basin Stratigraphic Chart
Detailed stratigraphy and tectonic history covering Delaware Basin, CBP & NW Shelf, and Midland Basin from Precambrian through Permian.
77 formations 3 columns Precambrian → Permian
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Louisiana — North Louisiana Salt Basin
North Louisiana Salt Basin Stratigraphic Column
Stratigraphic reference from Triassic through Paleogene including the Haynesville, Smackover, Cotton Valley, and Tuscaloosa formations.
48 formations Triassic → Paleogene
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North Dakota — Williston Basin
North Dakota Stratigraphic Column
Detailed reference for the Williston Basin covering formations from Precambrian through Holocene including the Bakken, Three Forks, Madison Group, and more.
75 formations Precambrian → Holocene
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Texas — East Texas Basin
East Texas Stratigraphic Chart
Cretaceous through Jurassic reference covering the Austin Chalk, Eagle Ford, Woodbine, Cotton Valley, and Smackover across East Texas Basin, Houston Embayment, and Rio Grande Embayment.
57 formations 3 columns Jurassic → Tertiary
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Wyoming & Montana — Powder River Basin
Powder River Basin Stratigraphic Column
Western and Eastern Powder River columns covering Cambrian through Tertiary including the Frontier, Muddy, Lakota, Sundance, Tensleep, Minnelusa, and Madison formations.
71 formations 2 columns Cambrian → Tertiary
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StratCity is a free interactive reference tool for oil & gas geologists, landmen, and petroleum engineers. Browse stratigraphic charts for the Oklahoma oil & gas basins, the Texas Permian Basin (Delaware, Midland, and Central Basin Platform), the North Louisiana Salt Basin including the Haynesville shale play, and the North Dakota Williston Basin including the Bakken and Three Forks, the East Texas Basin covering the Austin Chalk and Eagle Ford plays, and the Powder River Basin of Wyoming and Montana. Search by formation name, highlight multiple zones simultaneously, and compare lateral equivalents across columns — all in your browser with no login required.