Stratigraphic section of the Grand Canyon west of the Little Colorado River. This section is by J. S. Newberry, who was with the Ives expedition and was the first geologist to see the Grand Canyon.
Precambrian stromatolites. This sample is Conophyton - a species of conical shaped stromatolites. Stromatolites, algae and cyanobacteria were the earliest life forms to populate the oceans of earth.