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Paleozoic Life Ch 12 & 13 This artistic diorama models the living Environment for the Burgess

Paleozoic Life Ch 12 & 13 This artistic diorama models the living Environment for the Burgess shale organisms. Visible Life. In the Cambrian system of rocks, a large number of visible complex species were observed. Life had been single-celled simple organisms for billions of years.

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Paleozoic Life Ch 12 & 13 This artistic diorama models the living Environment for the Burgess

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  1. Paleozoic Life Ch 12 & 13 This artistic diorama models the living Environment for the Burgess shale organisms

  2. Visible Life In the Cambrian system of rocks, a large number of visible complex species were observed. Life had been single-celled simple organisms for billions of years. The “sudden” appearance of large, well-preserved organisms caused scientists to use the term “Cambrian Explosion” Not so fast – the Cambrian period lasted for 54 million years. Life appeared to evolve more rapidly but there had been many steps Leading to the new life forms. The Ediacara fossils were multi-celled soft-bodied predecessors Increase in oxygen may be responsible for increase in body size.Ocean chemistry was evolving and may have increased in calcium. Cambrian continents were apart allowing more marine habitat. Sauk transgression created more shallow marine habitat on shore. Global warming was occurring.

  3. Emergence of shelly faunaThis Cambrian fossil is a few mm

  4. What are advantages to having an exoskeleton? Protection from UV light, allowing organisms into shallow waters Prevents drying out in intertidal locations Supporting skeleton (shell) allows for increased size and attachment of muscle Protection from predators

  5. Cambrian predator:anamalocoris

  6. Olenellus, a Cambrian trilobiteshows signs healing wounds

  7. Marine ecosystem: plankton (phyto- zoo-), nekton, benthos, sessile, mobile, epifauna, infauna

  8. Marine Ecosystem • Where and how animals and plants live in the marine ecosystem Plankton: Jelly fish Sessile epiflora: seaweed Nekton: fish cephalopod Sessile epifauna: bivalve Benthos: d-k crinoid coral

  9. Marine Ecosystem Mobile epifauna: gastropod, starfish Infauna: worm, bivalve

  10. Marine Ecosystem Suspension feeders: coral crinoid bivalve

  11. Marine Ecosystem worm sediment-deposit feeder Carnivores-scavengers: starfish Herbivores: gastropod

  12. Trilobites: Conspicuous Cambrian fossils Fig. 1, p. 248

  13. Agnostus Believed to be blind Other trilobites have Compound eyes Fig. 3, p. 249

  14. Fig. 6, p. 249

  15. Fig. 5, p. 249

  16. Middle Ordovician Fig. 12-9, p. 251

  17. Late Ordovician Fig. 12-11a, p. 252

  18. Fig. 12-11b, p. 252

  19. Fig. 12-12a, p. 253

  20. Middle Devonian Reef Buildiers

  21. Middle DevonianNew York State Eurypterid Fig. 12-14, p. 254

  22. Late Devonian Ammonoid Fig. 12-15, p. 254

  23. Fig. 12-16, p. 255

  24. Fig. 12-19, p. 257

  25. http://www.youtube.com/watch?v=s1xfRc4SDsw&NR=1&feature=fvwp

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