The Precambrian basement rocks of the Upper Peninsula of Michigan became part of the North American continent
A) more than 2.5 billion years ago.
B) 1.9 billion years ago.
C) 1.8 to 1.9 billion years ago.
D) 1.7 to 1.8 billion years ago.
E) about 1.1 billion years ago.
Answer: B
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