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Tag Archives: Geology
North America Encounters the East Pacific Rise
The Yellowstone plume investigation keeps broadening. In the image below the heavy black line is the Pacific/Farallon ocean spreading ridge at ~30 million years ago when it first encountered North America. The current position of North America is outlined in … Continue reading
Posted in Climate, Geology, Plate Tectonics
Tagged earth-science, Geology, Subduction
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How Old is the Grand Canyon?
Controversies over wonders of the world capture the public imagination from time to time. Now some Caltech scientists have dared suggest from a new technique that measures the depth of overburden on apatite crystals that there was an older canyon … Continue reading
geosciencebigpicture 
