Wolfcampian
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| Wolfcampian | |
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| Name | Wolfcampian |
| Era | Paleozoic |
| Period | Permian |
| Age | Early Permian |
| Time start | ~298.9 Ma |
| Time end | ~283.5 Ma |
| Region | North America, West Texas, New Mexico, Oklahoma, Kansas |
| Named by | Charles Walcott |
| Type section | Glass Mountains |
Wolfcampian The Wolfcampian is an Early Permian chronostratigraphic interval recognized primarily in North American regional stratigraphy and correlated internationally with parts of the Asselian, Sakmarian, and Artinskian stages. It is used in literature on the stratigraphy of the Permian Basin, Glass Mountains, and surrounding regions and appears in studies by researchers working at institutions such as the Smithsonian Institution, United States Geological Survey, University of Texas at Austin, and Bureau of Economic Geology.
Definition and Chronostratigraphy
The Wolfcampian was originally defined within the regional schema for the Permian of western North America and is frequently discussed alongside the regional Leonardian, Guadalupian, and Lopingian subdivisions and global stages including the Asselian, Sakmarian, Artinskian, and Kungurian. Its type and reference sections are tied to classic exposures in the Glass Mountains and nearby sections examined by paleontologists and stratigraphers such as Charles Doolittle Walcott, Edward Oscar Ulrich, and Clyde A. Reeside Jr.. Correlation frameworks involve geochronological methods practiced at facilities like the U.S. Geological Survey, Geological Survey of Canada, and university laboratories at Stanford University, Harvard University, and the California Institute of Technology.
Geological Setting and Distribution
The Wolfcampian interval is best represented in the Permian Basin provinces of Texas, New Mexico, Oklahoma, Kansas, and extends into outcrops of the Glass Mountains, Apache Mountains, and subsurface plays beneath the Midland Basin and Delaware Basin. Deposits attributed to this interval also appear in regional sections studied by teams from University of Oklahoma, Texas A&M University, Oklahoma Geological Survey, and the New Mexico Bureau of Geology. International correlations have been attempted with sections in the Hercynian Belt, Urals, Kazakhstan, Siberia, and parts of the Zechstein–age successions mapped by the British Geological Survey and Russian Academy of Sciences.
Lithology and Depositional Environments
Wolfcampian strata comprise siliciclastic and carbonate lithologies observed in formations such as the Cisco Formation, Leonard Formation, Spraberry Formation, and equivalents reported in cores and outcrops documented by the American Association of Petroleum Geologists and the Society for Sedimentary Geology. Lithofacies include fluvial sandstones, deltaic shales, tidal flats, shallow marine carbonates, evaporites, and interdune silts; similar facies are discussed in relation to the Wolfcamp Shale intervals in petroleum literature from ExxonMobil, Chevron, ConocoPhillips, and other industry groups. Depositional models reference analogues from the Permian Basin, Gulf of Mexico paleo-margin reconstructions, and sequence stratigraphic frameworks developed at institutions such as Bureau of Economic Geology and Shell Oil Company research programs.
Paleontology and Biostratigraphy
Fossil assemblages from the Wolfcampian include marine invertebrates, benthic foraminifera, brachiopods, bryozoans, echinoderm fragments, and isolated vertebrate remains recorded in collections at the Smithsonian Institution, American Museum of Natural History, Field Museum, and university museums such as University of Kansas Natural History Museum. Biostratigraphic control commonly uses conodont zonations tied to work by researchers affiliated with International Commission on Stratigraphy, Palassian-era studies, and conodont specialists at University of Michigan and Texas Tech University. Trace fossils, ichnofacies studies, and palynology from cores and outcrops have been reported by investigators at Pennsylvania State University, University of California, Berkeley, and Iowa State University.
Economic Importance (Hydrocarbons and Minerals)
Wolfcampian strata constitute important hydrocarbon reservoirs and source rocks exploited in the Permian Basin by companies such as Pioneer Natural Resources, Occidental Petroleum, EOG Resources, Marathon Oil, and national agencies including Department of Energy studies. Reservoir characterization, hydraulic fracturing programs, and basin modeling efforts have been developed by consulting groups and research centers at Texas A&M University, Bureau of Economic Geology, and corporate labs at Halliburton and Schlumberger. Mineral resources associated with Wolfcampian evaporite and carbonate successions include gypsum and anhydrite mined historically by operators in New Mexico and West Texas and documented by the U.S. Bureau of Mines and state geological surveys.
History of Research and Nomenclature
The Wolfcampian name stems from 19th and early 20th century stratigraphic work in the Glass Mountains and Permian Basin by geologists such as Charles Doolittle Walcott, G. Arthur Cooper, R. C. Moore, and later review by stratigraphers at the United States Geological Survey and academic authors at University of Texas at Austin and Colorado School of Mines. Debates over its scope, correlation to global stages, and subdivision have engaged scientists meeting under the auspices of the International Geological Congress, American Association of Petroleum Geologists, and the International Commission on Stratigraphy. Major monographs, regional bulletins, and petroleum industry reports from entities like the American Chemical Society and Society of Economic Geologists have chronicled evolving concepts and practical uses of the Wolfcampian interval in stratigraphic practice.
Category:Permian stages