Map of ancient Lake Ridge.

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Map of ancient Lake Ridge.

http://www.worldcat.org/oclc/49880091

Series 5, folder 13 of record group 71-12 consists of a map of ancient Lake Ridge, showing the areas of the St. Lawrence River, Rock and Fox rivers, unnamed tributaries, lake levels, and land mass bordering lakes Erie, Ontario, Huron and Michigan.

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State Archive of Michigan

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SNAC Resource ID: 7614982

State Archive of Michigan

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Michigan. Geological Survey Division

http://n2t.net/ark:/99166/w6rn8b3q (corporateBody)

The Michigan Geological Survey was created by Public Act 20 of 1837. Its purpose was to conduct a geological and mineralogical survey of the state. The state legislature appointed Douglass Houghton the first state geologist (1837). In 1921, the state legislature established the Department of Conservation, and the Michigan Geological Survey became part of that department (Public Act 17 of 1921). The Department of Conservation established the Geological Survey Division circa 1947. In 1968, the dep...