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| Adamanian stratigraphy | |
|---|---|
| Name | Adamanian stratigraphy |
| Period | Permian–Triassic? |
| Region | Adamania (hypothetical) |
| Namedfor | Adamanian Basin |
| Namedby | Unknown |
Adamanian stratigraphy Adamanian stratigraphy describes the layered rock sequences of the Adamanian region and their temporal, lithologic, and paleontologic relationships. Work on Adamanian stratigraphy integrates field mapping, lithostratigraphic description, biostratigraphic correlation, radiometric dating, and tectonostratigraphic synthesis to interpret basin evolution, sedimentary processes, and faunal turnovers. Researchers apply methods developed in regional studies such as Charles Lyell, Roderick Murchison, Geological Society of London, United States Geological Survey, and International Commission on Stratigraphy frameworks.
The introduction situates Adamanian stratigraphy within wider stratigraphic practice and regional geology, referencing survey traditions of British Geological Survey, Geological Survey of India, United States Geological Survey, and comparative syntheses like those by William Smith, Adam Sedgwick, Archibald Geikie, and Gustav Steinmann. It outlines objectives similar to those in basin studies of the Paris Basin, North Sea Basin, Michigan Basin, and Amazon Basin, emphasizing lithostratigraphic frameworks, biostratigraphy tied to index fossils, and chronostratigraphic calibration via radiometric facilities such as K-Ar dating, U-Pb dating, and laboratories at Smithsonian Institution, USGS Flagstaff, and Geological Survey of Canada.
The geological setting places the Adamanian sequences in structural context alongside orogens and basins studied by researchers linked to Alfred Wegener concepts and plate reconstructions like those of John Dewey and W. Jason Morgan. Regional context invokes proximity or analogy to tectonic features such as the Himalayan orogeny, Andean orogeny, Caledonian orogeny, and back-arc basins similar to the Japan Sea. Sedimentary architectures show influence from processes described in works by J. Tuzo Wilson, S. Warren Carey, Alfred Wegener reconstructions, and basin models developed at institutions including the British Geological Survey and Geological Survey of India.
Stratigraphic units in the Adamanian include named formations, members, and unconformities analogous to units documented by Henry De la Beche, Charles Lyell, and regional schemes used by the International Commission on Stratigraphy. Correlation approaches follow practices employed in cross-basin studies of the Colorado Plateau, Sichuan Basin, Permian Basin, and Gabon Basin, using marker horizons, volcanic ash beds tied to U-Pb zircon ages, and fossil assemblages compared with collections from the Natural History Museum, London, Smithsonian Institution, and the American Museum of Natural History. Lateral and vertical correlation uses sequence stratigraphy methods popularized by Vail (seismic stratigraphy), Peter Vail, and sequence frameworks applied in petroleum provinces like the North Sea and Gulf of Mexico.
Lithologic descriptions emphasize sandstone, shale, carbonate, and volcanic lithofacies recorded by field campaigns from teams affiliated with University of Cambridge, Stanford University, Caltech, and the Chinese Academy of Sciences. Sedimentary structures are compared with modern analogs studied by John C. Remington, L. A. Buatois, and Mark A. Ashley and with classic texts by Leopold von Buch and James Hutton. Provenance analyses invoke geochemical fingerprinting approaches used in studies at Lamont–Doherty Earth Observatory, Geological Survey of Canada, and USGS, while diagenetic histories reference work by Robert Folk and petrographic standards from the Petrology Society.
Paleontological content draws comparisons with fossil assemblages cataloged at Natural History Museum, London, Smithsonian Institution, American Museum of Natural History, and regional museums. Index fossils used for biostratigraphy mirror practices involving taxa central to studies by Richard Owen, Othniel Charles Marsh, Edward Drinker Cope, and modern biostratigraphers at Ohio State University and University of Chicago. Faunal and floral lists are correlated against global ranges established through syntheses from the International Commission on Zoological Nomenclature, International Botanical Congress, and compendia like works by Sepkoski, Jack Sepkoski, and Derek Briggs to refine local biozones and correlate with global events documented in the Paleobiology Database.
Chronostratigraphic frameworks utilize dating techniques developed at institutions such as USGS, Geological Survey of Canada, University of Arizona geochronology labs, and international consortia like the International Union of Geological Sciences. Radiometric ages rely on methods including U-Pb dating, Ar-Ar dating, and isotopic work popularized by researchers at University of California, Berkeley and ETH Zurich. Calibration ties to the international time scale are informed by the International Commission on Stratigraphy chronostratigraphic charts and integrated with magnetostratigraphic datasets patterned after marine records compiled by teams led by Heirtzler and Cox.
Tectonic and depositional evolution synthesizes models from continental collision and rifting literature authored by John Dewey, J. Tuzo Wilson, W. Jason Morgan, and regional synthesis methods practiced by the British Geological Survey and Geological Survey of India. Depositional systems are interpreted using process-based analogs from the Mississippi Delta, Nile Delta, and shelf-margin settings studied in the North Sea and Gulf of Mexico, integrating subsidence analyses and basin modeling techniques developed at Shell research centers and academic programs at Imperial College London and Massachusetts Institute of Technology.
Category:Stratigraphy