Precambrian Eon
4.6 - 541 M 4.059
Proterozoic Eon
2.5 - 541 M 2,047,000,000
Neoproterozoic Era
1B - 541 659
Tonian Period
1B - 720 280
| 900 - 0 Choanoflagellates free-living unicellular & colonial flagellate eukaryotes closest living relatives to animals. |
| 850 - 0 Stages 4 & 5 02 sinks filled, gass accumulates |
| 850 Protesopongia Choanoflagellata best examples of what ancestor of animals looked like. |
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Precambrian Eon
4.6 - 541 M 4.059
Proterozoic Eon
2.5 - 541 M 2,047,000,000
Neoproterozoic Era
1B - 541 659
 Ediacaran Period
635 - 541Â 94
  635 - 541 94 Cloudina hartmannae, S Hemisphere |
  635 - 0 Ping-pong tree sponge, Chondrocladial, Indo-Pacific |
  635 - 541 94 Yorgia waggoneri, Finland, Ediacaran |
610 - 0Â Protostomia
| 600 It is thought that earliest multicellular life on Earth was a sponge-like creature. |
? Sponges are among simplest of animals, with partially differentiated tissues but without muscles, nerves, or internal organs.
Sponges ( Porifera) are phylogenetically oldest animal phylum extant today.
In some ways they are closer to being cell colonies than multicellular organisms. |
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