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Tectonic Evolution of the Southern Appalachian Mountains—500 Million Years Ago

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Summary

500 Million Years Ago—Iapetus Ocean Opens. Continental blocks destined to become North America and Gondwanaland drift apart. The eastern edge of ancient North America developed into a passive continental margin, similar to the modern East Coast. As the margin cooled and subsided, thick sedimentary strata covered the earlier mountains and rift valleys.

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plate tectonics geology geologic resources division southern appalachian mountains tectonic evolution million years north america margin iapetus ocean continental blocks gondwanaland drift east coast rift valleys national parks gallery high resolution
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Date

2019
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Source

National Parks Gallery
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Link

https://npgallery.nps.gov/
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Public Domain Dedication

label_outline Explore Iapetus Ocean, Southern Appalachian Mountains, Tectonic Evolution

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Topics

plate tectonics geology geologic resources division southern appalachian mountains tectonic evolution million years north america margin iapetus ocean continental blocks gondwanaland drift east coast rift valleys national parks gallery high resolution