A Tsunami Deposit at the Cretaceous-Tertiary Boundary in Texas
作者： J. BOURGEOIS , T. A. HANSEN , P. L. WIBERG , E. G. KAUFFMAN
DOI: 10.1126/SCIENCE.241.4865.567
关键词:
摘要: At sites near the Brazos River, Texas, an iridium anomaly and paleontologic Cretaceous-Tertiary boundary directly overlie a sandstone bed in which coarse-grained with large clasts of mudstone reworked carbonate nodules grades upward to wave ripple-laminated, very fine grained sandstone. This is only sequence uppermost Cretaceous lowermost Paleocene that records about 1 million years quiet water deposition midshelf outer shelf depths. Conditions for depositing such layer at these depths are most consistent occurrence tsunami 50 100 meters high. The likely source bolidewater impact.
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