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Paleozoic (542-251 mya) events

Paleozoic (542-251 mya) events. Late Paleozoic-key things. ･. Several key things happen beginning at. the end of the Silurian through the Permian. -. Assembly of Pangaea (also spelled Pangea). >. rearranges amounts of shallow marine habitats. >. rearranges climate of the world. >.

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Paleozoic (542-251 mya) events

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  1. Paleozoic (542-251 mya) events

  2. Late Paleozoic-key things ･ Several key things happen beginning at the end of the Silurian through the Permian - Assembly of Pangaea (also spelled Pangea) > rearranges amounts of shallow marine habitats > rearranges climate of the world > organisms are becoming more diverse > more families of organisms appearing - Development of Chordates > probably in repsonse to increasing competition > includes many common animals - Development of land plants >

  3. Pangaea ･ assembled by the early Permian ･ as it comes together - shallow epicontinental seas diminish in size > periodic- i.e., still fluctuating but getting smaller - Mountains are sources of sediment to the east and west in US

  4. Devonian world- tectonic & paleogeographic setting

  5. Devonian Paleogeography of N. America

  6. Carboniferous (Pennsylvanian) world- tectonic and paleogeographic setting

  7. Permian world- tectonic & paleogeographic setting

  8. Schematic Cyclothem

  9. Coal forests in Pennsylvanian and Mississippian • evidence suggests they did not stray too far from water sources - few plants in upland areas • Plant species like Lepidodendron (a family of plants known as a Lycopsids) - got really huge in the late Carboniferous • Sphenopsids (spine-like rushes and horsetail plants) - smaller than Lycopsids • Both reproduce by means of spores as opposed to seeds

  10. Ferns and tree ferns ･ also around beginning in late Devonian - haven't changed much in 370 million years ･ wide variety of sizes - some were small - some were as big as the biggest trees today

  11. Seed bearing plants • "seed ferns" were the first plants to produce true seeds - unlike real ferns that produce spores for reproduction • occurs in late Pennsylvanian • Offers a resistant package that can be transported long distances before germinating

  12. The “trunk” of a seed fern

  13. Reconstruction of ostracoderm Pteraspis

  14. A Placoderm fish about to munch on an unsuspecting lobe-finned fish

  15. Osteichthyans "bony fishes" • these show up in Devonian as well • eventually giving rise to Tetrapods - organisms that will eventually colonize the land

  16. Colonizing land - animal kingdom • Arthropods were first complex animals to colonize the land - bugs! • Amphibians were the first vertebrates to move onto land - still tied to the water for reproduction though

  17. Evolutionary links between lobe fins and tetrapods

  18. Chondrichthyes fossil • a fossil skate - related to sharks - and stingrays

  19. Coelocanth fish • lobe finned fishes are classified as Sarcopterygians and Crossopterygians

  20. During the Carboniferous and Permian insects like dragonflies got very large • Permian dragonfly had a wingspan of 1.5 meters!

  21. Permian Tetrapod amphibian Cacops

  22. Permian Reptile- Dimetrodon

  23. a late Permian tetrapod amphibian

  24. 4 big extinction events during the Paleozoic • Ordovician • Silurian • Devonian • Permian

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