Near-K/T age of clastic deposits from Texas to Brazil: impact, volcanism and/or sea-level lowstand?

TitleNear-K/T age of clastic deposits from Texas to Brazil: impact, volcanism and/or sea-level lowstand?
Publication TypeJournal Article
Year of Publication1996
AuthorsKeller, G, Stinnesbeck, W
JournalTerra Nova
Volume8
Pagination277–285
Date Publishedmay
Abstract

Near-K/T boundary clastic deposits from Texas, Mexico, Haiti, Guatemala and Brazil, often described as impact-generated tsunami deposits, are stratigraphically below well-defined K/T boundary horizons and appear not to be causally related to the K/T boundary event. Stratigraphic evidence indicates that their deposition began during the last 170–200 kyr of the Maastrichtian, coincident with a major eustatic sea-level lowstand that lowered sea level by as much as 70–100 m. Clastic deposition ended a few tens of thousands of years before the K/T boundary during a rapidly rising sea level. The presence of glass in clastic deposits in Haiti, northeastern Mexico and Yucatan suggests that the sea-level lowstand coincided with a time of major volcanism or pre-K/T boundary bolide impact.  PDF

URLhttps://doi.org/10.1111/j.1365-3121.1996.tb00757.x
DOI10.1111/j.1365-3121.1996.tb00757.x