Word: Ordovician
Part of Speech: Noun
Definition: The Ordovician is a period in Earth's history that occurred about 500 million to 425 million years ago. During this time, many types of marine life developed, including creatures like conodonts (small, tooth-like fossils), ostracods (tiny crustaceans), algae, and seaweeds. It is one of the periods of the Paleozoic Era, which is a time when life was mostly found in the oceans.
The Ordovician is an important term in geology referring to a specific time in Earth's history known for the variety of marine life.