A weathered sign in the Minnesota River Valley proudly proclaims ... that it’s probably not even the oldest in the United States, geologist Carol Frost and colleagues report in the March ...

Granite Falls, Minnesota, fits perfectly into that description ... After losing the conflict with the United States, the Dakota were forcibly removed. The town slowly grew from a single mill ...

The oldest rocks in the United States are located in the north-central part, where our three candidates are found, in the Archean Wyoming Province, the Minnesota River valley subprovince of the ...