Smithsonian Institution
National Museum of Natural History: Paleobiology: The Ordovician Period
Journey into the past while reading this comprehensive overview of the Ordovician Period that covers topics such as reef ecosystems, Paleozoic Fauna, fossil evidence, and climate and plate tectonics.
Science Struck
Science Struck: Flora and Fauna of the Ordovician Period
Describes plants and animals that lived during the Ordovician Period, where it falls in the geologic time scale, tectonic activity happening then, the climate and environment, and extinction events.
University of California
Ucmp: Paleozoic Era: Stratigraphy
This site contains a chart showing the progression of the Paleozoic Era. Each section of the chart leads to information about the geological, biological, and climatic elements of a specific period of the era.