THE ORDOVICIAN METEOR EVENT: EVIDENCE FROM IMPACT-DAMAGED ACRITARCHS AND THE 40AR/39AR DATE OF IMPACT SPHERULES FROM THE CROOKED CREEK STRUCTURE
SPENCER, Marissa, Department of Geosciences and Geological and Petroleum Engineering, Missouri University of Science and Technology, Rolla, MO 65409, OBOH-IKUENOBE, Francisca E., Department of Geosciences and Geological and Petroleum Engineering, Missouri University of Science and Technology, Rolla, MO 64509-0410 and WEBB, Laura, Department of Geography and Geoscience, University of Vermont, Burlington, VT 05405