Sylvania Sandstone

Sylvania Sandstone
Name	Sylvania Sandstone
Type	Formation
Age	Late Ordovician
Period	Ordovician
Primary lithology	Sandstone
Other lithology	Shale, conglomerate
Named for	Sylvania Township
Region	Great Lakes region
Country	United States
Unit of	Queenston Delta sequence
Underlies	Dayton Dolomite
Overlies	Amherstburg Formation

Sylvania Sandstone is a Late Ordovician siliciclastic rock unit recognized in the Great Lakes region of North America. It has been described in stratigraphic studies by regional geological surveys and is notable for well-sorted quartz arenites, quarry exposures, and a record of shallow-marine to marginal-marine processes. The unit figures in mapping projects by the United States Geological Survey, Ontario Geological Survey, and university research groups.

Description

The unit is typically a clean, well-bedded sandstone with interbeds of siltstone and minor conglomerate noted in outcrop descriptions by the Pennsylvania Geological Survey, Michigan Geological Survey, Kentucky Geological Survey, and Ohio Department of Natural Resources. Field studies published by scholars at the University of Michigan, University of Toronto, and Ohio State University emphasize its laterally continuous beds, cross-bedding, planar laminations, and occasional fossiliferous horizons reported by the Royal Ontario Museum and the Field Museum. Regional correlation efforts involve tie-ins to stratigraphic frameworks used by the Geological Society of America, Canadian Society of Petroleum Geologists, and International Commission on Stratigraphy.

Stratigraphy and Age

Regional stratigraphers place the formation within the uppermost Ordovician, correlated to conodont biostratigraphy and graptolite datums used in the Geological Time Scale committees. Biostratigraphic work by the Paleontological Society and Society of Vertebrate Paleontology supports a Late Ordovician age comparable to units such as the Trenton Group and the Cincinnati Arch carbonate successions studied by researchers at Yale University, Smithsonian Institution, and British Geological Survey. Sequence stratigraphic interpretations reference global eustatic curves published in journals like Nature, Science, and Geology.

Lithology and Sedimentology

Petrographic analysis by teams associated with the Mineralogical Society of America, Society for Sedimentary Geology, and Canadian Society of Petroleum Geologists reports dominantly quartzose sandstones with subordinate feldspar and lithic fragments, cemented by silica and calcite. Sedimentological features include trough and planar cross-stratification, ripple lamination, and channelized conglomerates analogous to descriptions from the Appalachian Basin, Michigan Basin, and St. Lawrence Platform documented by researchers at Princeton University, University of Chicago, and McGill University. Heavy mineral studies reference protocols from the American Geophysical Union and Royal Society.

Geographic Distribution and Outcrops

Exposures extend across southeastern Michigan, northwestern Ohio, and southwestern Ontario, with type-area descriptions tied to localities near Sylvania Township and mapped by the Ontario Geological Survey and Michigan Basin geological maps prepared for the United States Geological Survey. Prominent quarries and roadcut exposures are noted near Toledo, Detroit, Windsor, and Windsor-Essex County, with additional sections studied near Cleveland, Ann Arbor, and London through collaborative field programs involving the Cleveland Museum of Natural History and University of Windsor. Basin-scale mapping projects by the International Union of Geological Sciences include the unit in cross-border syntheses.

Paleoenvironment and Depositional History

Interpretations invoke a shallow epicontinental shelf, deltaic to shoreface systems influenced by eustatic sea-level changes documented in publications from the International Geoscience Programme, Geological Society of London, and American Association of Petroleum Geologists. Facies analysis conducted by researchers affiliated with Stanford University, University of California, Berkeley, and McMaster University suggests deposition under oscillating wave- and current-dominated regimes with episodic fluvial input comparable to modern analogues studied at the Woods Hole Oceanographic Institution and Scripps Institution of Oceanography. Sequence stratigraphy ties to global Ordovician events summarized by the Paleontological Association and European Geosciences Union.

Economic Uses and Quarrying

The sandstone has been quarried for building stone, dimension stone, aggregate, and filter media by commercial firms regulated by state agencies such as the Michigan Department of Environment, Great Lakes and Energy, Ohio Environmental Protection Agency, and Ontario Ministry of Natural Resources and Forestry. Historical use appears in architectural projects researched by the Society of Architectural Historians and recorded in municipal inventories for cities like Detroit, Toledo, Windsor, and Cleveland. Quarry engineering and resource assessments cite standards from ASTM International and the National Stone, Sand & Gravel Association.

Paleontology and Fossil Content

Fossil content is generally sparse but includes trace fossils, benthic invertebrate fragments, and isolated brachiopod and trilobite elements documented in collections at the Royal Ontario Museum, University of Michigan Museum of Paleontology, and Field Museum. Ichnological studies reference ichnotaxa described in journals of the Paleontological Society and British Paleontological Association, while microfossil analyses incorporate conodont and palynological data used by the Micropalaeontological Society and American Association of Stratigraphic Palynologists to refine biostratigraphic correlations.

Category:Ordovician geology Category:Sandstone formations