Critical evidence for the Cretaceous-Tertiary boundary impact includes ________.
A. the discovery of a crater covered by jungle vegetation in Brazil
B. an iridium anomaly in a thin layer of rock 65 million years old
C. dinosaur fossils worldwide just above the layer of impact debris
D. recovery of very large pieces of meteorite
E. an Iranian deposit of reddish iron-bearing strata
Answer: B
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