Board of Geological Survey and Biological Survey: Manitowish Range 1915
Click on the link below for the Board of Geological Survey and Biological Survey from 1915 contains detailed data on the Manitowish Range of rock formation that runs from Watersmeet, Michigan to south of Manitowish Waters. This passage is part of comprehensive geological analysis of the western Great lakes. Marked in yellow on the document is the reference to the channel between Island and Spider Lakes hat contains one of only two surface outcroppings of this geological formation. Who knew, that all of the props and skegs that hit those rocks in the channel were uncovering a unique rock formation.
