Wisconsin GS Lake Superior legacy collection of field notebooks and ledgers

Roland D. Irving established the Lake Superior Division of the USGS in 1882. As head of the Division, Irving began a detailed survey of the Upper Midwest during which he pioneered the application of microscopic petrography. The Division laid the groundwork for all later investigations of the Lake Superior region Precambrian rocks (Dott, 2001). The raw data used to produce this influential work is detailed in the Lake Superior Legacy Collection field notebooks and ledgers. Scanned copies of the notebooks can be accessed through: http://data.wgnhs.wisc.edu/lake-superior-legacy/index.html.