Paleoproterozoic
Speech parts
1. Paleoproterozoic - Adjective
2. Paleoproterozoic - Proper noun
Meaning
Paleoproterozoic
(geology) The era from 2,500 Ma to 1,600 Ma, marked by a dramatic increase in atmospheric oxygen.
Paleoproterozoic (not comparable)
(geology) Of a geologic era within the Proterozoic eon from 2,500 to 1,600 million years ago.
Examples
The only extensive iron formations that were deposited after the Paleoproterozoic (after 1.8 billion years ago) are associated with Cryogenian glacial deposits.
They formed as the result of partial melting of Paleoproterozoic to Ordovician high-grade metasedimentary rocks of the Higher Himalayan Sequence about 20 to 24 million years ago during the subduction of the Indian Plate.