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Date of Award


Document Type

Campus Access Master's Report

Degree Name

Master of Science in Geology (MS)

Administrative Home Department

Department of Geological and Mining Engineering and Sciences

Advisor 1

John S. Gierke

Committee Member 1

Thomas Oommen

Committee Member 2

Alex Mayer


Arch Rock, located on the southeast corner of Mackinac Island Michigan, is a limestone arch formed via wave erosion of Nipissing Great Lakes and is a prominent cultural site and tourist location for the Mackinac State Historic Park. Limestone is highly susceptible to weathering processes such as freeze-thaw and dissolution due to its structure and chemical composition. The purpose of this study is to identify the potential weathering processes occurring at Arch Rock, identify any areas of interest at the arch that may require mitigation efforts, suggest possible mitigation techniques and lay the foundation for further geo-technical investigation of the site. This study was conducted using photographic analysis of relative fracture size and density and giving different sections of the arch a Geological Structure Index number, comparison to both historic photographs and records from past investigations, and the development of 3D models using Agisoft Photoscan to identify large scale structures not easily identified in 2D photographs.