Explore the geological history of the North Cascades in this comprehensive lecture focusing on the Eocene period and clockwise rotation in Washington state. Delve into topics such as the Yakima Fold and Thrust Belt, Western Washington reverse faults, and the Siletzia basalt horseshoe shape. Learn about old and new models for the Cascades, and gain insights from geologist Basil Tikoff on the extent and causes of rotation in the region. Examine the relationship between North American craton and accretions, Blue Mountains rotation, and the broader West Coast rotation. Investigate the driving forces behind these rotations and their implications for offshore plate movements. The lecture concludes with an informative Q&A session, providing additional context and clarification on this fascinating geological phenomenon.
Overview
Syllabus
Video Starts
Lecture Starts
Outline
Clockwise Rotation in WA
Yakima Fold and Thrust Belt
Western WA Reverse Faults
Siletzia Basalt Horseshoe Shape
Old and New Cascades
Old Model for the Cascades
New Model for the Cascades
Basil Tikoff
How far back does the rotation go?
Laurentia
North America Craton vs Accretions
Blue Mountains Rotation
North America - West Coast Rotation
What caused the rotation?
Where is the pivot point?
What's driving the rotations?
Can the older rotation say something about what the plates were doing offshore?
Q&A
Toast and Goodbye
Taught by
Nick Zentner
