Bellefonte Formation

__notoc__The Ordovician Bellefonte Formation (Obf) is a mapped bedrock unit in central Pennsylvania.

Description

The Bald Eagle is defined as a medium-gray, brownish-weathering, medium-bedded dolomite and minor sandstone. The very fine grained Tea Creek Member lies above, and the crystalline Coffee RunMember lies below.

=Depositional Environment=

Deposition of formations such as the Bellefonte Dolomite occurred in environments equivalent to the modern Bahama lagoons, east of Miami. [cite web |url=http://72.14.205.104/search?q=cache:Gahcnodzl0oJ:www.geosc.psu.edu/~engelder/geosc465/Trip.rtf+%22Bald+Eagle+Formation%22+NAME&hl=en&ct=clnk&cd=3&gl=us&client=firefox-a |title= Structures of The Appalachian Foreland Fold-Thrust Belt: Fold-Thrust Geometries of the Juniata Culmination (State College and Environs), Central Appalachians of Pennsylvania | publisher = Pennsylvania State University Department of Geosciences |accessdate=2008-01-27 |format=]

Age

Relative age dating of the Bald Eagle places it in the Ordovician period. It rests atop the Axemann Formation (Oa),cite web |url=http://www.dcnr.state.pa.us/topogeo/map1/explanation.pdf |title= Explanation of Geologic Units |accessdate=2008-01-26 |format= |work=|publisher=Pennsylvania Geological Survey] or the Nittany Formation, for example between Tyrone and Water Street, Pennsylvania, where the Axemann is missing, and the Loysburg Formation of interbedded limestone and dolomite conformably overlies the Bellefonte Formation.cite web |url=http://www.dcnr.state.pa.us/topogeo/tbr/stop3.aspx |title=Trenton Black River Carbonates: Stop 3|publisher=Pennsylvania Geological Survey |accessdate=2008-01-27 |format= |work=Trenton and Black River Carbonates in the Union Furnace Area of Blair and Huntingdon Counties, Pennsylvania]

Economic Uses

ee also

*Geology of Pennsylvania

References