Bedrock Geology and Structural Analysis of the Fannettsburg 7.5-Minute Quadrangle, Pennsylvania
Faculty Mentor
Chad Pritchard
Presentation Type
Poster
Start Date
4-14-2026 2:00 PM
End Date
4-14-2026 4:00 PM
Location
PUB NCR
Primary Discipline of Presentation
Geosciences
Abstract
Structural interpretations of the Fannettsburg 7.5-minute quadrangle, located in Franklin, Fulton, and Huntingdon Counties, Pennsylvania, focus on the characteristics of folds, faults, and lithologic units within the Ridge and Valley province of south-central Pennsylvania. The quadrangle is composed primarily of Ordovician to Devonian limestones and shales, with additional sandstones and dolostones present in the middle to late Ordovician units. Folds in the area trend northwest, including the Fannettsburg Syncline, which has an axial plane of 240°,55° NW and a hinge line of 35°,220°, indicating a moderately inclined, close fold. These structures formed during the Alleghanian Orogeny approximately 325–260 million years ago. The orientation of these folds aligns with regional northwest-trending structures in the Appalachian Ridge and Valley province, demonstrating that local deformation reflects the compressional tectonics associated with late Paleozoic Appalachian mountain building.
Recommended Citation
Crossley, Andrew, "Bedrock Geology and Structural Analysis of the Fannettsburg 7.5-Minute Quadrangle, Pennsylvania" (2026). 2026 Symposium. 1.
https://dc.ewu.edu/srcw_2026/ps_2026/p3_2026/1
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
Bedrock Geology and Structural Analysis of the Fannettsburg 7.5-Minute Quadrangle, Pennsylvania
PUB NCR
Structural interpretations of the Fannettsburg 7.5-minute quadrangle, located in Franklin, Fulton, and Huntingdon Counties, Pennsylvania, focus on the characteristics of folds, faults, and lithologic units within the Ridge and Valley province of south-central Pennsylvania. The quadrangle is composed primarily of Ordovician to Devonian limestones and shales, with additional sandstones and dolostones present in the middle to late Ordovician units. Folds in the area trend northwest, including the Fannettsburg Syncline, which has an axial plane of 240°,55° NW and a hinge line of 35°,220°, indicating a moderately inclined, close fold. These structures formed during the Alleghanian Orogeny approximately 325–260 million years ago. The orientation of these folds aligns with regional northwest-trending structures in the Appalachian Ridge and Valley province, demonstrating that local deformation reflects the compressional tectonics associated with late Paleozoic Appalachian mountain building.
