proterozoic

The name Proterozoic comes from Greek and means "earlier life".

However, macroscopic fossils are now known from the late Proterozoic.

Proterozoic: a period of modern plate tectonics until the first animals.

Instead, the geological record seems to suggest it cooled dramatically during the early Proterozoic.

On the north, it is bounded by the Proterozoic Province.

No rocks earlier than the Proterozoic occur at surface within England.

These lower Proterozoic clastic rocks are subdivided into two groups.

This means plate tectonic processes similar to today's must have been active during the Proterozoic.

The is especially likely for earlier periods such as the Paleozoic and Proterozoic.

It is the last geological period of the Proterozoic Eon.

Another recent development is the official division of the Proterozoic Eonothem into systems, which was decided in 2004.

Another source estimates the age at 800-500 million years (late Proterozoic to early Paleozoic).

The Proterozoic saw a couple of severe ice ages called snowball Earths.

The first known glaciations occurred during the Proterozoic.

The Dzhugdzhur range has a basement formed out of a block which is from the early Proterozoic.

These newer Proterozoic sediments were then tilted and faulted.

The geologic record of the Proterozoic is much better than that for the preceding Archean.

As the Proterozoic Eon drew to a close, the Earth started to warm up.

Geochemical evidence strongly indicates that the total mass of plankton has been similar to modern levels since early in the Proterozoic.

During the late Proterozoic Era when the most extensive early ice age occurred, the Sun's heat was 25 percent less than it is today.

The Nonesuch is Middle Proterozoic, with an estimated age of approximately 1.1 billion years.

The fault zone is very ancient and initially formed during the Proterozoic Eon.

The region is composed of rocks of Proterozoic to Quaternary age.

Together the ranges make up a folded block structure, which first formed during the Archean and Proterozoic.

The substitution of oxygen for carbon dioxide in the atmosphere occurred in the Proterozoic.