The Mesozoic Era is one of three geologic eras of the Phanerozoic eon. The division of time into eras dates back to Giovanni Arduino, in the 18th century, although his original ...
An overview of the era from the UC Berkeley Museum of Paleontology.
An intro to the Mesozoic era, includes a review of each of the geological sub-divisions and the various forms of life that lived during this time