Mesoproterozoic

MesoproterozoicEon:ProterozoicAge: 1,000 1,600 million years agoSubdivisionsStenian: 1,000 - 1,200 million years agoEctasian: 1,200 - 1,400 million years agoCalymmian: 1,400 - 1,600 million years ago

Calymmian (1.6-1.4 bya)Derived from the Greek word for "cover. Photosynthetic organisms continue to proliferate. Oxygen builds up in the atmosphere above 10%.

Formation of ozone layer starts blocking ultraviolet radiation from the sun.1.5 bya: Eukaryotic (nucleated) cells appear.

2015/2/9Before it became like this

It wasBreaking apart of the first continent Columbia.

Ectasian (1.4 to 1.2 bya)Derived from the Greek word for "extension.Origin of sexual reproduction of organisms.Green (Chlorobionta) and red (Rhodophyta) algae abound.

Found on Somerset Isle, North Canada. Bangiomorpha pubescens(type of red algae), the first taxonomically resolved eukaryote. 1.2 billion years old.

Stenian (1.2 to 1 bya)Derived from the Greek word for "narrowSuper continent Rodinia (Russian for "homeland") was assembled . It was surrounded by a single ocean named Mirovia (Russian for global).

The first large scale mountain building episode, theGrenville Orogeny, for which extensive evidence still survives.Grenville Orogeny, showing the extent of the Orogeny as the continents collided to create Rodinia. From Karlstrom, K.E., 1999.

11Configuration of Rodinia during the Stenian From USGS.

Growths of stromatolites along the coastlines.

Above: living stromatolites at Shark's Bay, Australia-End Of Report-

Reporters:Annmielyn G. ViceraFelipe O. Villegas III