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| Hovey Member | |
|---|---|
| Name | Hovey Member |
| Type | Member |
| Period | Carboniferous |
| Unit of | unnamed formation |
| Region | Illinois Basin |
| Named for | Hovey, Indiana County |
Hovey Member The Hovey Member is a stratigraphic unit recognized in parts of the Midwestern United States, notable for its mixed clastic and carbonate lithologies and its paleontological assemblages. It is cited in regional correlation studies involving the Illinois Basin, Appalachian Basin, and cratonic interior interpretations, and is used in resource assessments and paleoenvironmental reconstructions.
The Hovey Member is defined as a mappable lithostratigraphic subdivision composed predominantly of shale, siltstone, thin sandstone, and interbedded limestone nodules. Its lithofacies have been compared with those in the Chesterian Series, Mississippian, Pennsylvanian, New Albany Shale, and Kaskaskia Sequence contexts, and descriptions often reference field sections measured near exposures studied by workers from Illinois State Geological Survey, Indiana Geological Survey, United States Geological Survey, and university departments at University of Illinois Urbana–Champaign, Purdue University, and Indiana University Bloomington. Petrographic and geochemical analyses cite correlations with units studied by researchers at American Geophysical Union, Society for Sedimentary Geology, and laboratories equipped with facilities at Smithsonian Institution and Field Museum of Natural History.
Biostratigraphic and lithostratigraphic evidence places the Hovey Member within the late Mississippian to early Pennsylvanian transition intervals recognized across the Illinois Basin, Appalachian Basin, and adjacent cratonic shelves. Correlation has been made with units in the Absaroka Sequence discussions and tied to conodont, fusulinid, and palynological zonations used by specialists from Paleontological Society, American Association of Petroleum Geologists, and academic groups at Ohio State University, Kentucky Geological Survey, and West Virginia University. Sequence-stratigraphic interpretations relate the Hovey Member to regional transgressive–regressive cycles evident in work by researchers associated with International Commission on Stratigraphy and regional syntheses in publications from Geological Society of America.
The Hovey Member yields a diversity of marine and marginal-marine fossils including brachiopods, crinoids, bryozoans, gastropods, bivalves, and trace fossils often described in comparative studies alongside assemblages from Warsaw Formation, Borden Group, Paint Creek Shale, and Waverly Formation. Microfossils such as conodonts and foraminifera have been important for biostratigraphic placement by teams at University of Iowa, University of Cincinnati, and Yale University. Vertebrate microremains and plant debris reported from equivalent strata have been discussed in literature involving American Museum of Natural History, Carnegie Museum of Natural History, and paleobotanical collections at Royal Botanic Gardens, Kew for comparative taxonomy work.
Exposures and subsurface occurrences of the Hovey Member have been documented across portions of Illinois, Indiana, Kentucky, and Ohio within the Illinois Basin and along its margins. Key outcrops and roadcuts referenced in regional mapping include sites near Evansville, Indiana, Terre Haute, Indiana, and sections accessed during field trips organized by Geological Society of America and state surveys. Subsurface distribution is constrained by well logs archived by Indiana Geological Survey, Illinois State Geological Survey, and industry data submitted to Energy Information Administration and companies affiliated with American Petroleum Institute standards.
The Hovey Member has been evaluated for its potential as a source rock, shale-hosted hydrocarbons, and as a seal or reservoir in sandstone lenses in regional petroleum assessments conducted by American Association of Petroleum Geologists, Chevron Corporation, and state agencies. Its shale intervals are of interest in studies of unconventional resource potential alongside units like New Albany Shale and Antrim Shale, with environmental and engineering assessments carried out by teams from Environmental Protection Agency, National Energy Technology Laboratory, and universities including Purdue University. Limestone nodules and thin carbonate beds have been locally quarried for aggregate and lime, and such uses are discussed in reports produced by U.S. Bureau of Land Management and state departments of transportation such as Indiana Department of Transportation.
The Hovey Member was named and characterized in regional stratigraphic syntheses by geologists working with Indiana Geological Survey and contributors to state geological bulletins and field guides assembled by organizations like Geological Society of America and American Association of Petroleum Geologists. Historical field work and type section descriptions reference legacy collections and maps housed at institutions including University of Illinois Urbana–Champaign, Purdue University, and the United States Geological Survey. Ongoing revisions to its definition and correlation reflect continued research by scholars affiliated with Ohio State University, Kentucky Geological Survey, and international stratigraphic initiatives coordinated through the International Union of Geological Sciences.
Category:Stratigraphic units of the United States