Ancient Denvers: Ancient Denvers is a virtual exhibit that highlights 13 reconstructions of ancient Colorado landscapes.
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.
The Permian: This site from the University of California Museum of Paleontology offers basic information on the stratigraphy, ancient life, localities and tectonics of this period.