Mesoproterozoic

Origin

- + meso + Proterozoic

Full definition of Mesoproterozoic

Adjective

1. (geology) Of a geologic era within the Proterozoic eon; comprises the Calymmian, Ectasian and Stennian periods from about 1600 to 900 million years ago, when the Rodinia supercontinent was formed.

Proper noun

1. (geology) The Mesoproterozoic era.