This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| Sherburne Formation | |
|---|---|
| Name | Sherburne Formation |
| Type | Geological formation |
| Period | Ordovician |
| Primary lithology | Limestone, dolostone |
| Other lithology | Shale, chert |
| Region | Appalachian Basin, Adirondack region |
| Country | United States, Canada |
| Namedfor | Sherburne, New York |
| Unitof | Trenton Group |
| Underlies | Plattsburgh Formation |
| Overlies | Trenton Limestone |
Sherburne Formation The Sherburne Formation is an Ordovician carbonate-dominated unit recognized in the northeastern United States and adjacent Canada. It is notable for its fossiliferous limestones and dolostones that record Middle to Late Ordovician marine cycles and correlate with units studied in classic stratigraphic sections and by paleontologists focused on the Appalachian Basin and the Adirondack Mountains.
The Sherburne consists principally of bioclastic limestone and dolostone with interbeds of nodular chert, calcareous shale, and occasional phosphatic horizons, reflecting carbonate platform processes described in regional studies by workers associated with institutions such as the United States Geological Survey, New York State Museum, and university geology departments at Colgate University, Union College, and SUNY Albany. Typical textures include grainstone, packstone, and wackestone fabrics comparable to lithologies in the Trenton Group, the Chazy Formation, and the Plattsburgh Formation. Diagenetic features include pervasive dolomitization, stylolitization, and local pyritization similar to observations made in Ordovician sequences of the Appalachian Basin and the Ontario Basin.
The Sherburne is placed in the Middle to Late Ordovician, broadly correlated to the Darriwilian to Sandbian stages used in global chronostratigraphy and tied to biostratigraphic zonations established from graptolites, conodonts, and brachiopod assemblages studied by researchers at the Smithsonian Institution and the Yale Peabody Museum. It commonly forms part of the Trenton Group succession and lies stratigraphically between the underlying Trenton Limestone and the overlying Plattsburgh Formation, showing sequence boundaries and flooding surfaces that correlate with eustatic events recognized in the Cincinnatian Series and the Bois Blanc Formation. Regional mapping by the New York State Geological Survey and the Ontario Geological Survey has refined its extent and contacts.
The Sherburne yields diverse marine fossils, including articulate and inarticulate brachiopods examined in collections at the American Museum of Natural History and the Field Museum, trilobites comparable to faunas from the Taconic Orogeny-influenced basins, crinoid ossicles studied by paleontologists affiliated with Harvard University and Columbia University, echinoderm fragments, bryozoans similar to taxa described from the Champlain Valley, and mollusks such as gastropods and bivalves paralleling faunas from the St. Peter Sandstone succession. Microfossils including conodont elements and chitinozoans have been used for biostratigraphic correlation in work associated with the Paleontological Society and the Geological Society of America. Fossil taphonomy and community structure comparisons invoke studies from Bromide Formation sections and classic Ordovician localities cataloged by museums like the Buffalo Museum of Science.
Sedimentological and facies analyses interpret the Sherburne as deposited on a warm, shallow epicontinental carbonate platform influenced by episodic siliciclastic input and storm reworking, echoing depositional models applied to the Bahama Platform analogs used by researchers at Woods Hole Oceanographic Institution and the Scripps Institution of Oceanography. Evidence for tidal flat, lagoonal, and open-shelf settings is supported by sedimentary structures, bioclastic assemblages, and dolomitization patterns comparable to those documented in the Great Bahama Bank and the Palmyra Atoll studies. Sequence stratigraphic frameworks align Sherburne transgressive-regressive cycles with global eustatic curves developed by the International Commission on Stratigraphy.
Outcrops of the Sherburne are best exposed in the Champlain Valley, the Mohawk Valley, and along roadcuts and quarry faces in upstate New York and adjacent Ontario, with notable exposures near the town of Sherburne, the eponymous type area. Regional correlations extend into parts of the Appalachian Basin and equivalents mapped on geological quadrangles produced by the United States Geological Survey and the New York State Geological Survey. Classic field localities used in educational field trips by Colgate University and SUNY Oneonta provide accessible sections for teaching sequence stratigraphy and fossil identification.
The Sherburne's limestones and dolostones have been quarried for construction aggregate, flux in steelmaking, and raw material for cement production by regional companies and municipal agencies, paralleling utilization patterns of Ordovician carbonates in the Great Lakes and Mid-Atlantic regions. Dolomitized horizons host secondary porosity that has been evaluated for groundwater resources in hydrogeological studies undertaken by the New York State Department of Environmental Conservation and the United States Geological Survey, while phosphate-rich beds have attracted limited mineral assessment by industrial geologists and consultants affiliated with firms in the extractive sector. Conservation and land-use planning involving Sherburne exposures engage local historical societies and state parks such as those coordinated with the New York State Office of Parks, Recreation and Historic Preservation.
Category:Ordovician geology Category:Geologic formations of New York (state) Category:Geologic formations of Ontario