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 ...

The No. 1 "easy to moderate" hiking trail in the United States can be found in Minnesota. That's according to USA Today's 10Best Reader's Choice Awards, which placed The Devil's Kettle Trail at the ...

Wyoming geologist Carol Frost and three of her colleagues have identified a new oldest rock in America. Found in Michigan, ...

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 ...