Michigan Basin Specimen Database: This site showcases Michigan Basin fossils from the private collections of Friends of the University of Michigan Museum of Paleontology and select specimens from the University of Michigan collection, including type specimens.
Some Fossil Brachiopods: Images of several fossil brachiopods, dating in geologic age from early Cambrian to Pleistocene, with explanatory text.
Ordovician Fossils in Ogle County, Illinois: An amateur collection of fossils gathered at various sites in Illinois, primarily Ordovician.
Graptolites: Graptolites (literally translated "writing on rock") are an extinct group of Paleozoic colonial organisms, most often found as thin carbonized films in various shales or limestones from the Cambrian to the Carboniferous. Following are graptolites collected from the Athens Shale formation (Ordovician age) near Montevalo, Alabama.