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  _____________

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

5. Global “Ice Ages” through time

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

7. 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

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

10. II. Glaciation Basics
B. Landforms

11. II. Glaciation Basics
Erosional
2. Depositional

14. III. Pleistocene Glaciation

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

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

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

19. II. Pleistocene Glaciation
C. Glacial Intervals
Glacials =
Interglacials =

20. III. Pleistocene Pacific Northwest
Puget Lobe

21. III. Pleistocene Pacific Northwest

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

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