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Contact: John Valley
valley@geology.wisc.edu
608-263-5659
University of Wisconsin-Madison

Timeline

Caption: This is a timeline of the history of our planet places the formation of the Jack Hills zircon and a "cool early Earth" at 4.4 billion years.

Credit: Andree Valley

Usage Restrictions: None

Related news release: Oldest bit of crust firms up idea of a cool early Earth


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