Definition: The word "Archeozoic" refers to an ancient geological era, which spans from around 245 million years ago until about 66 million years ago. This time period is known as the Mesozoic Era, because it was a time of great ecological change and biodiversity expansion. Definition: The Archeozoic, or Mesozoic Period, represents an ancient geological era spanning approximately 245 to 66 million years. During this time, the Earth underwent a significant evolutionary process that included the development of several major geological formations. The term "Archeozoic" comes from the Greek word "archaeos" (meaning earth) and "zoiklos" (meaning rock formation).
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