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Pleistocene Glaciation in the Pacific Northwest

Explore the profound impact of ice ages in Earth's history, particularly in the Pacific Northwest region, examining glacial intervals, causes of ice ages, and Pleistocene glaciation. Discover the formation of landforms and glaciers, key geological periods, and the extent of glacial coverage, including the Puget Lobe and Okanogan Lobe in Central Washington. Uncover the effects of changes in atmospheric compositions, tectonic uplifts, and oceanic circulation patterns during major ice ages.

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Pleistocene Glaciation in the Pacific Northwest

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  1. Pleistocene Glaciation in the Pacific Northwest

  2. I. Ice Ages A prolonged _______________in Earth’s history in which global climate is significantly _________than the mean with significant portions of surface covered by _______________. • most ice ages lasted ____________________ • ice ages of geologic past  _____________

  3. I. Ice Ages • Major Ice Ages in the geologic past • Precambrian  • Paleozoic  • Mesozoic  • Cenozoic 

  4. Global “Ice Ages” through time

  5. I. Ice Ages Cenozoic • ~30 Ma (Oligocene)  first ice sheets in __________________ • 12-10 Ma  _________________________ • ~2.0 Ma  ___________________________

  6. I. Ice Ages B. Causes Ice Ages • Continental drift & tectonic uplifts • Changes in atmospheric compositions  GHG’s • Long term volcanism • Sun-Earth orbital variations • Changes in oceanic circulation • Solar output

  7. II. Glaciation Basics • Types of glaciers 1. Alpine (mountain glaciers) 2. Continental Ice Sheets

  8. II. Glaciation Basics B. Landforms

  9. II. Glaciation Basics • Erosional 2. Depositional

  10. III. Pleistocene Glaciation

  11. II. Pleistocene Glaciation A. Intro to the Pleistocene • most recent glaciation  • several glacial periods  • globally  • North America, northern Europe, northern Asia, Antarctica • Extensive ____________________________

  12. Pleistocene Ice Age: 30% of Earth’s surface covered

  13. II. Pleistocene Glaciation B. Pleistocene North America • Canada  ___________________________ • New England & Great Lakes • Northern Tier states • Pacific Northwest  ____________________ • Mountainous west

  14. II. Pleistocene Glaciation C. Glacial Intervals • Glacials = • Interglacials =

  15. III. Pleistocene Pacific Northwest • Puget Lobe

  16. III. Pleistocene Pacific Northwest

  17. III. Pleistocene Pacific Northwest B. Okanogan Lobe & Central Washington

  18. III. Pleistocene Pacific Northwest C. Colville, Pend Oreille, Purcell Lobes

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