1 / 26

Pleistocene Glaciation in the Pacific Northwest

Pleistocene Glaciation in the Pacific Northwest. 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 ____________________

rositar
Download Presentation

Pleistocene Glaciation in the Pacific Northwest

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related