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myr ago
510
511 Wheeler Formation (1)
512
513
514
515
516
517
518 Burgess Shale Formation (1)
519
520 first Hemichordates (1)
521
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523 Kaili (1)
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527 first trilobite (4)
528
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530 Chengjiang (1) stem groups deuterostomes (1) first Ctenophores (1)
531 first Cephalochordates (1) first chordates (1)
532
533 Sirius Passet(1) priapulids (1) annelids (1)
534 first brachiopods (1)
535 first arthropods (1)
536 first Lobopodians/Anomalocarians (1)
537 First nematodes (1) first molluscs (1) first Halkieriids (1) First echinoderms(1)
538 Abundant Shelly fossils (1)
539
540
541 Skeletonized foraminifera (6)
542
543 shelly fauna (1) Cambrian boundary (1)
544
545
546 Cloudina (1) stem group ecdysozoans (1)
547
548 first stem group lophotrochozoans (1)
549
550 Advanced Ediacaran fauna (1) Spriggina [trilobite precursor]
551
552
553 first anthozoan (1)
554
555 Kimberella (first mollusc forerunner) (5)
556
557
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560 earliest fungi (1) earliest stem-group cnidarian (1)
561
562
563 Mistaken Point faunas (1)
564
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566
567
568 end of ice age? (1)
569
570
571 first sponge (Doushantuo)? (2,3)
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590         ___
591          ^
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599          |
600 Varanger-Marinoan glaciation
601          |
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604          |
605          |
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608          |
609          v
610 Oldest Ediacaran fossils Mackenzie Mtns Canada (5)
 

References
1 Simon Conway Morris, "The Cambrian 'Explosion': Slow-fuse or Megatonnage?" Proc. Natl. Acad. Sci. USA, 97(2000):9:4426-4429, p. 4427

2 James G. Gehling and J. Keith Rigby," Long Expected Sponges from the Neoproterozoic Ediacara Fauna of South Australia," Journal of Paleontology, 70(2):1996:185-195, p. 185

3 Chia-Wei Li, Jun-Yuan Chen and Tzu-En Hua,"Precambrian Sponges with Cellular Structures," Science 279(1998):879-882, p. 879

4 T. Peter Crimes, "Trace Fossils and Correlation of Late Precambrian and Early Cambrian Strata," Geol. Mag. 124(1987):97-119, p. 107, 108, 109,110,
111

5 M. W. Martin, D. V. Grazhdankin, S. A. Bowring, D. A. D. Evans, M. A. Fedonkin and J. L. Kirschvink, “Age of Neoproterozoic Bilaterian Body and Trace Fossils, White Sea, Russia: Implications for Metazoan Evolution,” Science, 288(2000):841-845
 

6 Culver, Stephen J, 1991, "Early Cambrian Foraminifera from West Africa," Science 254(1991):689-691

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