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090629KTBoundary

NCPR contributing astonomer Aileen O'Donoghue is in Colorado this summer. In this photo, her ring finger marks the geological KT boundary, a layer of ash, dust and iridium laid down by the meteorite impact that wiped out the dinosuars 65 million years ago. Photo submitted by Aileen from Arapahoe County, Colorado.

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Uploaded on June 29, 2009
Taken on June 28, 2009