52 Pennsylvania

Elizabeth Johnson

Geology and mineral resources of the Mifflintown quadrangle, Pennsylvania

Figure 13. Conlin, R.R., and Hoskins, D.M., 1962, Geology and mineral resources of the Mifflintown quadrangle, Pennsylvania: Pennsylvania Geological Survey, Atlas 126, scale 1:24,000

Use this link to zoom in and pan around the map: https://ngmdb.usgs.gov/ngm-bin/pdp/zui_viewer.pl?id=46722

Figure 14. Conlin, R.R., and Hoskins, D.M., 1962, Geology and mineral resources of the Mifflintown quadrangle, Pennsylvania: Pennsylvania Geological Survey, Atlas 126, scale 1:24,000

Use this link to zoom in and pan around the cross-sections: https://ngmdb.usgs.gov/ngm-bin/pdp/zui_viewer.pl?id=46723

The link to the page for this map is: https://ngmdb.usgs.gov/Prodesc/proddesc_32840.htm

 

Questions

Figure 15. Close-up of the geologic map showing structures A and B.

13. Rock unit Sr (the Rose Hill Formation) in the center of structure A is _______ unit Sb (the Bloomsburg Formation) in the outside of Structure A.

  • younger than
  • the same age as
  • older than

 

14. Examine the strike and dip symbols around Structure A, especially near the center of the map. The rock beds dip towards the ________ of Structure A.

  • center
  • outside

 

15. Structure A is:
(Hint: look at the cross-sections and review structures at Folds and Plunging Folds)

  • an anticline
  • a plunging anticline
  • a syncline
  • a plunging syncline

 

16. Structure B is:
(Hint: look at the cross-sections and review structures at Folds and Plunging Folds)

  • an anticline
  • a plunging anticline
  • a syncline
  • a plunging syncline

 

Curious as to which (compressional) plate tectonic event caused this geologic mess?  Read about it here: http://faculty.kutztown.edu/friehauf/Pennsylvania_history/0275_Pennsylvania_tectonic_history.html

You can also check out this event on the plate tectonic animation through time- look around 300 million years ago. Plate Motion Through Geologic Time

License

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Physical Geology Laboratory by Elizabeth Johnson is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License, except where otherwise noted.

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