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Cretaceous-Tertiary (K-T) boundary near the town of Zumaya, Spain. The boundary occurs immediately below the ledge (lower center) formed by the erosion-resistant Tertiary strata. The boulders in the foreground lie in the pre-K-T gap. Statistical analysis of the fossil distributions in this and other Bay of Biscay sections reveals a complex of extinction patterns in the latest Cretaceous. See page 1360 and the News story on page 1303. [Photo: Peter D. Ward, University of Washington]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)