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Massive Cretaceous-Paleogene boundary deposit in Gulf of Mexico



From: Ben Creisler
bcreisler@gmail.com

A new online paper:

Richard A. Denne, Erik D. Scott, David P. Eickhoff, James S. Kaiser,
Ronald J. Hill and Joan M. Spaw (2013)
Massive Cretaceous-Paleogene boundary deposit, deep-water Gulf of
Mexico: New evidence for widespread Chicxulub-induced slope failure.
Geology (advance online publication)
doi: 10.1130/G34503.1
http://geology.gsapubs.org/content/early/2013/07/03/G34503.1.abstract



The single largest-known mass wasting deposit has been identified at
the Cretaceous-Paleogene (K-Pg) boundary in the deep-water Gulf of
Mexico, in 31 industry-drilled wells and on seismic data,
corresponding to the "MCU" (middle Cretaceous unconformity) horizon.
The deposit has an average thickness of 10–20 m on the upper slope and
90–200 m on the lower slope and basin floor, and is on an unconformity
that represents 9 m.y. to 85 m.y. The deposit contains the distinctive
association of lithic fragments, impact-derived material, and reworked
microfossils (i.e., the Cretaceous-Tertiary boundary "cocktail")
associated with the Chicxulub impact, and is predominantly composed of
graded pelagic carbonates. These new findings substantiate widespread
slope failure induced by the Chicxulub impact and provide further
evidence of a single impact coincident with the K-Pg mass extinction.