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| Galena Dolomite | |
|---|---|
| Name | Galena Dolomite |
| Type | Formation |
| Period | Ordovician |
| Primary lithology | Dolomite |
| Other lithology | Limestone, chert |
| Named for | Galena, Illinois (city) |
| Region | Midcontinent United States |
| Country | United States |
| Unit of | Platteville Group (example) |
| Underlies | Decorah Shale (example) |
| Overlies | Maquoketa Shale (example) |
Galena Dolomite The Galena Dolomite is an Ordovician carbonate rock unit significant in Midcontinent stratigraphy and resource geology. It has been studied in the context of regional correlations among the United States Geological Survey, Illinois State Geological Survey, Wisconsin Geological and Natural History Survey, Iowa Geological Survey, and Missouri Geological Survey. Researchers from institutions such as Harvard University, Yale University, University of Chicago, University of Wisconsin–Madison, University of Iowa, University of Illinois Urbana–Champaign, Ohio State University, Indiana University Bloomington, Cornell University, and Stanford University have contributed to its characterization.
The Galena Dolomite occupies a position within Ordovician stratigraphic frameworks correlated with units described in works by the United States Geological Survey and regional surveys like the Illinois State Geological Survey, the Iowa Geological Survey, and the Wisconsin Geological and Natural History Survey. Stratigraphic studies reference classic sections near Galena, Illinois and exposures mapped by the Missouri Geological Survey, the Minnesota Geological Survey, and researchers affiliated with Michigan State University and the University of Minnesota. Correlations have been drawn to units discussed in regional syntheses by authors associated with the Geological Society of America, the Paleontological Society, and field programs of the Smithsonian Institution. Sequence stratigraphy comparisons involve frameworks developed at the Scripps Institution of Oceanography and methodologies from the U.S. Army Corps of Engineers for regional mapping.
Lithologic descriptions produced by the United States Geological Survey, Illinois State Geological Survey, and petrographic analysts at Purdue University document dolomitization, carbonate fabric, and secondary chert nodules. Mineralogical analyses cite occurrences of dolomite, calcite, chert, marcasite, pyrite, and minor fluorite in studies by teams at Massachusetts Institute of Technology, Rutgers University, Pennsylvania State University, and the University of Michigan. Geochemical work by researchers affiliated with the Arizona State University, Texas A&M University, University of Arizona, and the National Oceanic and Atmospheric Administration applied isotopic techniques refined by laboratories at Carnegie Institution for Science, Lamont–Doherty Earth Observatory, and the Los Alamos National Laboratory.
Interpretations of depositional settings cite regional work by the United States Geological Survey, paleogeographic reconstructions by the University of California, Berkeley, and carbonate sedimentology syntheses from the University of Texas at Austin and the University of Kansas. Models describe shallow epicontinental sea deposition influenced by sea-level changes documented in publications associated with the Geological Society of America, the American Association of Petroleum Geologists, and researchers at the University of Oklahoma and University of Missouri. Comparative studies use analogs from Ordovician successions examined by teams at the British Geological Survey and the Geological Survey of Canada.
The Galena Dolomite has economic relevance for carbonate-hosted mineralization and aggregate resources noted by the United States Geological Survey, state surveys including the Illinois State Geological Survey, the Iowa Geological Survey, and industry reports from the American Institute of Professional Geologists and the American Geosciences Institute. Historic mining in the region involved companies recorded by the Missouri Department of Natural Resources and commerce authorities such as the Chicago Board of Trade. Exploration and resource assessments have been undertaken by geoscientists affiliated with ExxonMobil, Chevron Corporation, Shell plc, Freeport-McMoRan, and consulting firms with ties to Bureau of Land Management studies. Environmental and reclamation guidelines relate to standards from the Environmental Protection Agency, U.S. Fish and Wildlife Service, and the U.S. Forest Service.
Fossil assemblages have been cataloged by curators at the Smithsonian Institution, Field Museum of Natural History, American Museum of Natural History, Peabody Museum of Natural History, and university collections at Ohio State University and University of Wisconsin–Madison. Documented taxa include brachiopods, trilobites, bryozoans, and echinoderms reported in paleontological studies tied to the Paleontological Society, the Geological Society of America, and academic programs at Yale University, Harvard University, Cornell University, University of Cincinnati, and University of Kansas. Biostratigraphic zonation references classic works by researchers associated with the British Museum (Natural History), now the Natural History Museum, London.
Outcrops and subsurface occurrences are mapped across parts of Illinois, Iowa, Wisconsin, Minnesota, Missouri, and adjacent states documented by the United States Geological Survey and state geological surveys: the Illinois State Geological Survey, Iowa Geological Survey, Wisconsin Geological and Natural History Survey, Minnesota Geological Survey, and the Missouri Geological Survey. Regional mapping projects coordinated with institutions such as the University of Illinois Urbana–Champaign, University of Iowa, University of Minnesota, and the University of Wisconsin–Madison provide detailed coverage.
Nomenclatural history involves early descriptions made during 19th-century surveys by figures connected to the United States Geological Survey, early state geologists in Illinois and Iowa, and publication venues like the Journal of Geology, the American Journal of Science, and transactions of the Geological Society of America. Later revisions and regional syntheses were produced by researchers at the Illinois State Geological Survey, the Iowa Geological Survey, the Wisconsin Geological and Natural History Survey, and contributors affiliated with universities including University of Chicago, Harvard University, Yale University, and Ohio State University.