Ordovician
Links
The Ordovician
http://www.ucmp.berkeley.edu/ordovician/ordovician.html
An overview of the period from the UC Berkeley Museum of Paleontology.
Ordovician Geography
http://vishnu.glg.nau.edu/rcb/Ordovician.html
Description and maps of the continents as they existed at the time.
Wisconsin Fossils
http://www.fox.uwc.edu/fossils/wisc/
Ordovician Trentonian fauna from the Galena and Maquoketa of West De Pere and Green Bay, Wisconsin