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ANSWER:</h2>
<u><em>If you have found a radiometric age for the surrounding layers of volcanic ash, you can say that the age of the intervening layer is halfway between those specific dates.</em></u>
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Answer:
D disruption of hibernation or migration cycles
<span>High concentrations of iridium, of extraterrestrial origin, shocked quartz, evidence of fire, tsunami deposits, a fern spore spike, indicating colonization of disturbed landscapes by ferns, and the large Chicxulub impact structure in the Yucatan, dated to c 65 mya--about the same time as the end of the Mesozoic.</span>
