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Ediacarans, Small Shells and the Dawn of the Phanerozoic

Ediacarans, Small Shells and the Dawn of the Phanerozoic. Edicaran Biota. First fossils of multicellular organisms Some controversy Multicellular life? Colonies of single cells? Definitely not single cells Signs of tissue differentiation Advanced symmetry. Ediacaran (Vendozoan)Biota.

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Ediacarans, Small Shells and the Dawn of the Phanerozoic

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  1. Ediacarans, Small Shells and the Dawn of the Phanerozoic

  2. Edicaran Biota • First fossils of multicellular organisms • Some controversy • Multicellular life? • Colonies of single cells? • Definitely not single cells • Signs of tissue differentiation • Advanced symmetry

  3. Ediacaran (Vendozoan)Biota

  4. Taphonomy of theEdicaran Biota • Soft/firm bodied? • Molds and casts in coarse sandstone • Facies preference? • Taphonomic bias?

  5. Radial and Bilateral Symmetry

  6. Radial Symmetry

  7. Bilateral Symmetry and Differentiated Structures

  8. Symmetry and Diversity

  9. Filter Feeders?

  10. Differentiated Structures, But Which End Was Up?

  11. Significant Diversity or Variations on a Single Theme?

  12. Dawn of the Phanerozoic: Small Shelly Fauna and Trilobites

  13. What Do We Choose as the Start of the Cambrian? • Extinction of the Ediacarans? • First appearance of the ”small shelly fauna”? • Late Proterozoic • First trilobites? – Part of “Cambrian Explosion” • Lower, but not lowest Cambrian • First trace fossils of trilobites? • First evidence of mobility (burrows)? • First burrows chosen

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