Mazon Creek Virtual Exhibit- University of California Museum of Paleontology: This page has more detailed information and additional links on the fossils at Mazon Creek, as well as the rocks, environment, plants, and animals of the Carboniferous.
Mazon Creek Fossils: Hosted by the Illinois State Museum in Springfield, IL, this site is a great resource for information on the rocks, fossils, and history of the Mazon Creek area, including many excellent images.
Ancient Denvers: Ancient Denvers is a virtual exhibit that highlights 13 reconstructions of ancient Colorado landscapes.
Crawfordsville Crinoid Fossils: An online gallery of fossil crinoids found in Crawfordsville, Montgomery County, Indiana.
Virtual Museum of Fossils: Geosciences, at Georgia's Valdosta State University, presents an interactive virtual museum of invertebrate and vertebrate fossil specimens. Explore the collection by animal, or by time period from Precambrian to Quaternary. Maps are detailed and include ecosystem distribution. Fossil photographs, many showing multiple views, list information about where the fossil was found, and how it is categorized taxonomically. Some pages feature a drawing of the animal's skeleton showing the fossil bone in red.
The Third Planet - a walk through geologic time: This virtual exhibit offers a tour of the Milwaukee Public Museum's geology exhibits, depicting the continuing evolution of the Earth from the Precambrian to present.
Pennsylvanian Fossils of Missouri: Although these Pennsylvanian pages are named "Pennsylvanian Fossils of Missouri", this web site is more accurately devoted to a study of the Altamont Formation, containing the fossiliferous Lake Neosho Shale, at one locality in the St. Louis, Missouri, Pennsylvanian Outlier.
Mississippian Fossils of Missouri: The Mississippian Fossils of Missouri project is focused on the Mississippian exposures in the St. Louis area.
Trilobites of America: Images and taxonomic and locality information for trilobites occurring in North America (the U.S. and Canada). Specimens are ordered according to geologic periods.
The Carboniferous: This site from the University of California Museum of Paleontology offers basic information on the stratigraphy, ancient life, localities and tectonics of this period.