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Tectonic Evolution of the Southern Appalachian Mountains—400 Million Years Ago

diagram of oceanic crust being subducted under continental crust

400 Million Years Ago—Iapetus Ocean Narrows during Subduction. Oceanic sediments and volcanic islands were at times added to the edge of North America.

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illustration modified from “Parks and Plates: The Geology of our National Parks, Monuments and Seashores,” by Robert J. Lillie, New York, W. W. Norton and Company, 298 pp., 2005, www.amazon.com/dp/0134905172.

Public domain:Full Granting Rights

Image

Geologic Resources Division, Code: GRD

NPS.gov Collection

11/26/2019

11/26/2019

Monday, February 3, 2020 12:01:17 PM

Monday, February 3, 2020 12:01:17 PM

diagram 400 mya iapetus ocean narrows during subduction@10x.jpg

Wednesday, November 27, 2019 12:07:45 AM

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235.2 kB

2019-11-26T17:07:45-07:00

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