A tsunami deposit at the Cretaceous-Tertiary boundary in Texas

Details A tsunami deposit at the Cretaceous-Tertiary boundary in Texas A tsunami deposit at the Cretaceous-Tertiary boundary in Texas

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988sci...241..567b&link_type=abstract

Science (ISSN 0036-8075), vol. 241, July 29, 1988, p. 567-570. AChS-supported research.

Mathematics

Logic

54

Geochronology, Hypervelocity Impact, Meteorite Craters, Tsunami Waves, Carbonates, Iridium, Paleontology, Sandstones, Texas

Scientific paper

At sites near the Brazos River, Texas, an iridium anomaly and the paleontologic Cretaceous-Tertiary boundary directly overlie a sandstone bed in which coarse-grained sandstone with large clasts of mudstone and reworked carbonate nodules grades upward to wave ripple-laminated, very fine grained sandstone. This bed is the only sandstone bed in a sequence of uppermost Cretaceous to lowermost Paleocene mudstone that records about 1 million years of quiet water deposition in midshelf to outer shelf depths. Conditions for depositing such a sandstone layer at these depths are most consistent with the occurrence of a tsunami about 50 to 100 meters high. The most likely source for such a tsunami at the Cretaceous-Tertiary boundary is a bolide-water impact.

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