Structural Analysis of McCoysville Quadrangle Juniata, Mifflin, and Perry Counties, Pennsylvania
Faculty Mentor
Chad Pritchard
Presentation Type
Poster
Start Date
4-14-2026 11:30 AM
End Date
4-14-2026 1:30 PM
Location
PUB NCR
Primary Discipline of Presentation
Geosciences
Abstract
Structural interpretations of the McCoysville quadrangle, located in central Pennsylvania, including a fold analysis of the 45° trending Tuscarora Syncline, which is widely believed to have been formed by the Alleghanian Orogeny, which occurred roughly 250 to 300 Ma (Bentley et. al., 2020). Analyses are to understand the relationship between map structures and regional tectonics. The rocks present in the stratigraphic layers of the area are sedimentary rocks, with an exception of the Tuscarora formation, which is quartzite. The rocks are ages Ordovician to Devonian. In the McCoysville quadrangle, there are many large anticlines and synclines, all trending roughly 45° NE. I found that the Tuscarora Syncline has an axial plane of 69, 83 S, a hinge line of 11, 248, and an interlimb angle of 153°, making the formation a gently plunging, gently folded syncline. The axial plane is perpendicular to the force which formed it, which was the Alleghanian Orogeny, as previously mentioned above.
Recommended Citation
Oneto, Madison, "Structural Analysis of McCoysville Quadrangle Juniata, Mifflin, and Perry Counties, Pennsylvania" (2026). 2026 Symposium. 20.
https://dc.ewu.edu/srcw_2026/ps_2026/p2_2026/20
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
Structural Analysis of McCoysville Quadrangle Juniata, Mifflin, and Perry Counties, Pennsylvania
PUB NCR
Structural interpretations of the McCoysville quadrangle, located in central Pennsylvania, including a fold analysis of the 45° trending Tuscarora Syncline, which is widely believed to have been formed by the Alleghanian Orogeny, which occurred roughly 250 to 300 Ma (Bentley et. al., 2020). Analyses are to understand the relationship between map structures and regional tectonics. The rocks present in the stratigraphic layers of the area are sedimentary rocks, with an exception of the Tuscarora formation, which is quartzite. The rocks are ages Ordovician to Devonian. In the McCoysville quadrangle, there are many large anticlines and synclines, all trending roughly 45° NE. I found that the Tuscarora Syncline has an axial plane of 69, 83 S, a hinge line of 11, 248, and an interlimb angle of 153°, making the formation a gently plunging, gently folded syncline. The axial plane is perpendicular to the force which formed it, which was the Alleghanian Orogeny, as previously mentioned above.
