Oct 15 2004
The animated Cordillera
The Animated Cordillera, Animation, by James W. Sears (University of Montana) is a nice animated gif that shows the plate motions 220-60 Ma, and covers much of the western US and Canda.
Accompanying test provides point form information about each site. The perspective is interesting:
“The lines are actual geological features such as the lower-middle Cambrian paleo-shoreline position or the zero edge of the Belt Supergroup (see legend). The map implies that the accreted terranes of the Cordillera are not far travelled wanderers, but have origins in an Aleutian-type arc and its collapsing marginal sea.”
(from http://www2.umt.edu/geology/faculty/sears/animation/aboutanimated.htm).
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