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Stratigraphy is the study of rock strata and their intrepretation in term of absolute or relative age.

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How old is Steptoe Butte (WA, USA)?

Steptoe Butte is a quartzite "island" in the sea of loess known as the Palouse Hills, in eastern Washington and western Idaho in the United States. According to Wikipedia: The rock that forms the but …
Jean-Marie Prival's user avatar