Notes

Slide Show

Outline

1	So What about Oregon? The Real Story
2	Oregon the Plates 3 Plates are involved Pacific (Oceanic Plate) North American (Continental) Juan de Fuca (Oceanic Plate) Fallaron during the Late Miocene Accretion- a shearing and scraping off the top layer This formed the Coast range
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5	Oregon The costal range is mainly from Accretion from the Juan de fuca plate Convergent Boundary Sea levels dropped and some uplift to form the current coast line
6	Tectonics
7	Juan deFuca
8	Cascade Volcanic Range These are the result of the Subduction and melting Juan de Fuca & Pacific plate
9	Cascade eruptions
10	Mt. Hood
11	Mt Hood Eruptions and Glaciers
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13	Oregon Fault Zones Run NW to SE Olympic-Wallowa Vale Brother’s** Eugene-Denio McLouglin
14	Accounting for Formations in the John Day Area 1. Clarno Formation 2. John Day Formation 3. Picture Gorge Basalts 4. Mascall Formation 5. Rattlesnake Formation
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16	Clarno ~ 44 mya Andesitic lavas Loose ash Mud flows “Lahars” Fossils of a wet tropical climate
17	John Day Formation ~36 mya Large ash deposits Ingnimbrites Rhyolites Tuffs Basalts Semi-tropical fossils 3 Layers Big Basin (Red) Turtle Cove (Green) Kimberly (Buff)
18	John Day Fossil Beds
19	Basalt Flows of OR and WA
20	Columbia River Basalts Flows
21	Columbia River Basalt Groups
22	Columbia Plateau
23	Flows Saddle Mountian 0.6-14.5 mya 19 Flows Wanapum 14.5-15.2 mya 36 Flows Grand Ronde 15.6-16.8 mya 120 Flows Prineville 15.3-15.5 mya 8 Flows Picture Gorge 16.0-16.5 mya 61 Flows Imnaha 16.8-17.3 mya 67 flows
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25	Mascall Formation Volcanic Tuffs Many of the Cascade Range eruptions Miocene Fossils Temperate Climate indicated
26	Rattlesnake Formation Last of the major widespread eruptions Major sediments Cap of welded tuff (ignimbrite) Very hard cap
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28	Brothers Fault Zone
29	Diamond Craters Lava Field ~2,500 years ago New Lave flows Cinder cones
30	Playas and Pluvial Lakes
31	Steens Mountain
32	Steens Mountain Fault Block
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36	Oregon History
37	Oregon History
38	Oregon History
39	Geologic map
40	Geologic Column
41	Malheur Cave
42	Diamond Craters Lava Field
43	Diamond Craters
44	Lava flow at Diamond Craters
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