The document summarizes information about early life on Earth, including the earliest life forms such as stromatolites and cyanobacteria. It discusses evidence from formations like the Apex Chert in Australia that contain microfossils of early prokaryotes. Later, eukaryotes emerged, as evidenced by fossils from 770 million years ago. The Ediacara Hills of Australia preserve imprints of some of the earliest complex multicellular organisms from approximately 630-550 million years ago.

1. UNIVERSITY OF CALGARY SPRING 2010 GLGY 209-20 INTRODUCTION TO GEOLOGY I

4. The oldest life forms

7. Schreiber Beach Cryptozoon

8. The first Precambrian fossils Eosphaera

11. Stromatolite morphology

13. Stromatolite persistence

29. Ediacara Hills (southern Australia).

30. Precambrian Time Scale

36. Ediacaran Animals Today? Living sea-pens from offshore NW Australia.

37. Ediacara dominant fossils

43. Interpretation dynamics