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Cretaceous

Cretaceous. Early Cretaceous. Middle Cretaceous. Late Cretaceous. Cretaceous-Tertiary Boundry. Cretaceous Conditions. High sea level Wilson Cycle slow Mean water temperature 10 o C warmer Thermal expansion of oceans High oxygen content in atmosphere Gymnosperm vegetation dominant

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Cretaceous

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  1. Cretaceous

  2. Early Cretaceous

  3. Middle Cretaceous

  4. Late Cretaceous

  5. Cretaceous-Tertiary Boundry

  6. Cretaceous Conditions • High sea level • Wilson Cycle slow • Mean water temperature 10oC warmer • Thermal expansion of oceans • High oxygen content in atmosphere • Gymnosperm vegetation dominant • Reptiles rule!

  7. Cretaceous-Tertiary Boundary • Meteor impact just north of Yucatan • Massive volcanism in India • Reactivation of plate motion • Northern Hemisphere fallout • Dust, soot, iridium • Peak in fungus

  8. Tertiary • Significant mountain building and continental uplift • Thermal maximum • Rise of angiosperms • Rise of mammals

  9. Tertiary of Colorado Two episodes of mountain uplift 53 peaks >14,000 feet Three episodes of igneous activity

  10. Paleocene-Eocene Thermal Maximum

  11. Angiosperms • Flowering Plants • Abundant seeds – fruit • Diverse ecological niches • Great food for animals

  12. Rise of Mammals • Four chamber heart more efficient • Internal thermal regulator • Specialized teeth

  13. Causes of Change in Fauna • Environment • Animals go elsewhere • Evolution • Animals evolve into something else • Replacement • Animals can’t compete with new arrivals

  14. Evolutionary Halflife • Bats 1,600,000 y • Carnivors 610,000 y • Insectivors 490,000 y • Even toed U 490,000 y • Rodents 490,000 y • Odd toed U 260,000 y • Primates 230,000 y • Proboscidea 180,000 y • Total 540,000 y

  15. For Monday The Climate System and Glaciation Chapter 10

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