AIPG South Dakota Section Summer 2023 Field Trip
The Geology of Custer State Park and a portion of Wind Cave National Park

Saturday, September 9, 2023

The field trip was led by Brian Fagnan, geologist with the South Dakota Geological Survey. The trip included stops along the Needles Highway, an abandoned pegmatite mine, Sylvan Lake, Mt. Coolidge, and the Rankin Ridge area of Wind Cave National Park. The trip was attended by eight members, family, and friends of the South Dakota Section.

Photo 1: Group photo along Needles Highway

 
2.  Reviewing the Geologic Map of the Custer Quadrangle.                                   3.  Reviewing the Geologic Map of the Custer Quadrangle.

 
4.  Looking at a rare occurrence of marble rock.                                                                                                                                                                                  5.   Looking at a rare occurrence of marble rock. 

6. 

 
7.  The "Eye of the Needle", Needles Highway                                                                                                           8.  Harney Peak Granite near an abandoned pegmatite mine.

   
9.  View from Mt. Coolidge.                                                                        10.  Looking at a rare occurrence of marble rock.                                       11.  Remnant of an abandoned pegmatite mine.

12.  View from the Needles Highway.

 
13.  Mount Coolidge

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