Fortunately, the crater detectives had the benefit of some important clues. At first, the clues seemed to point toward an oceanic location for the crater, a worrisome possibility given the likelihood that in that case it would no longer be visible. As the K-T boundary clay continued to be studied, however, other evidence began to come to light that suggested a continental landing site. For example, the boundary clay contains a small but persistent fraction of broken rock fragments, the majority of which are granitic, and granite is only

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