Field Trip: Cambrian and Ordovician Stratigraphy of Southwestern Wisconsin Field trip route and notes looking at Cambrian and Middle Ordovician rocks of southwestern Wisconsin. Bedrock Geology Data and Resources WOFR2018-02 Field Trip: Cambrian and Ordovician Stratigraphy of Southwestern Wisconsin Zambito, J.J., IV; McLaughlin, P.I.; Batten, W.G.; 2018 Report: 23 p. Download Related Collections Open-File Report View Open-File Report