Bellefonte Formation
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The Ordovician Bellefonte Formation (Obf) is a mapped bedrock unit in central Pennsylvania.
[edit] 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 Run Member lies below.[1]
[edit] Depositional Environment
Deposition of formations such as the Bellefonte Dolomite occurred in environments equivalent to the modern Bahama lagoons, east of Miami.[2]
[edit] Age
Relative age dating of the Bald Eagle places it in the Ordovician period. It rests atop the Axemann Formation (Oa),[1] 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.[3]
[edit] Economic Uses
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Please help improve this section by expanding it. Further information might be found on the talk page or at requests for expansion. (January 2008) |
[edit] See also
[edit] References
- ^ a b Explanation of Geologic Units. Pennsylvania Geological Survey. Retrieved on 2008-01-26.
- ^ Structures of The Appalachian Foreland Fold-Thrust Belt: Fold-Thrust Geometries of the Juniata Culmination (State College and Environs), Central Appalachians of Pennsylvania. Pennsylvania State University Department of Geosciences. Retrieved on 2008-01-27.
- ^ Trenton Black River Carbonates: Stop 3. Trenton and Black River Carbonates in the Union Furnace Area of Blair and Huntingdon Counties, Pennsylvania. Pennsylvania Geological Survey. Retrieved on 2008-01-27.
