Yooperlites are rocks that fluoresce under UV light. The best time to search for Yooperlites is after a storm, when waves may have unearthed new rocks along the shores of Lake Superior. Rock hunters ...
CC0 Usage Conditions ApplyClick for more information. How do field geologists know which rocks are the oldest rocks on the planet? Learn more from Mike, one of our research geologists and curators.
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