Other
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...252.1690m&link_type=abstract
Science (ISSN 0036-8075), vol. 252, June 21, 1991, p. 1690-1693. Research supported by Florida International University.
Other
26
Cretaceous-Tertiary Boundary, Petrography, Quartz, Tektites, Tsunami Waves, Basalt, Bolides, Haiti, Photomicrographs, Spherules
Scientific paper
The marker bed at the Cretaceous-Tertiary boundary of the Beloc Formation (Haiti) contains abundant coarse-grained microtektites and minor amounts of shocked quartz grains in the basal part. The upper part is composed of medium-grained marl with amalgamated microtektite lenses and finer-grained marl lenses disseminated throughout. Field and petrographic observations, and the distribution of planktonic foraminifera suggest that the bed formed from a complex sequence of events. A bolide impact nearby produced microtektites that settled to form a nearly pure layer at the base. Vaporized materials with anomalously high extraterrestrial components settled last, along with carbonate sediments. The entire bed became sparsely consolidated. Subsequently, another major disruptive event, perhaps a giant tsunami, partly reworked the inital deposit. Cohesive fragments of the original marker bed mixed with exotic materials were redeposited as lenticular bodies.
Maurrasse Florentin J.-M.
Sen Gautam
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