Precambrian geology


4.5 Billion years ago to 543 Million years ago. This includes about seven eighths of the earth's history. Its divisions are not yet well described here.	Sapience Home Site Map About Sapience Science Earth Science Geohistory

4.5 Billion years ago to 543 Million years ago. This includes about seven eighths of the earth's history. Its divisions are not yet well described here.

Hadean

4.5 to 3.8 Billion years years ago. This period is not formally recognized, in part because it predates the appearance of the oldest known rocks.

Archaean

3.8 to 2.5 Billion years ago. The oldest known rocks date to this period.

Proterozoic

2.5 Billion years to 548 Million years. Transition to oxygen atomsphere.


Other areas of knowledge such as Personal studies, anthropology, culture, institutions, sociology, and history will be connected as this site develops.	Links to other sites Not yet included.
Other sciences. Biology including biohistory, ecology, systematics, organism biology, cell biology, and molecular biology may be helpful. Other earth science including other geohistory, physical geography, atmospheric science, hydrospheric science, and geology will be significant. Astronomy including cosmology, galactic astronomy, stellar astronomy, and local astronomy can be connected. Chemistry and physics are less directly connected.

Other areas of knowledge such as Personal studies, anthropology, culture, institutions, sociology, and history will be connected as this site develops.

Links to other sites
Not yet included.

Other sciences.

Biology including biohistory, ecology, systematics, organism biology, cell biology, and molecular biology may be helpful. Other earth science including other geohistory, physical geography, atmospheric science, hydrospheric science, and geology will be significant. Astronomy including cosmology, galactic astronomy, stellar astronomy, and local astronomy can be connected. Chemistry and physics are less directly connected.