title: A tsunami deposit at the cretaceous-tertiary boundary in Texas.
abstract: 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 bolidewater impact.
authors.forename: J
authors.initials: J
authors.lastname: Bourgeois
authors.forename: T A
authors.initials: TA
authors.lastname: Hansen
authors.forename: P L
authors.initials: PL
authors.lastname: Wiberg
authors.forename: E G
authors.initials: EG
authors.lastname: Kauffman