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THE GLOBAL STRATIGRAPHY OF THE CRETACEOUS-TERTIARY BOUNDARY IMPACT EJECTA
- J. Smit
- 1 May 1999
The Chicxulub crater ejecta stratigraphy is reviewed, in the context of the stratigraphy of underlying and overlying rock sequences. The ejecta sequence is regionally grouped in (a) thick polymict…
Time Scales of Critical Events Around the Cretaceous-Paleogene Boundary
Radiometric dating establishes the mass extinction that killed the dinosaurs as synchronous with a large asteroid impact between the Cretaceous-Paleogene boundary and associated mass extinctions with the Chicxulub bolide impact to within 32,000 years.
Coarse-grained, clastic sandstone complex at the K/T boundary around the Gulf of Mexico: Deposition by tsunami waves induced by the Chicxulub impact?
The K/T boundary in marine deposits in and around the Gulf of Mexico at a distance of <800 km from the Chicxulub impact structure is marked by a series of unusual sandstone beds in almost any…
Extinction and evolution of planktonic foraminifera after a major impact at the Cretaceous/Tertiary boundary
- J. Smit
- Environmental Science
Tektite-bearing, deep-water clastic unit at the Cretaceous-Tertiary boundary in northeastern Mexico.
The authors' observations at the Mimbral locality support the hypothesis of a K-T impact on nearby Yucatán, Mexico, and interpret this clastic unit as the deposit of a megawave or tsunami produced by an extraterrestrial impact.
Coeval 40Ar/39Ar Ages of 65.0 Million Years Ago from Chicxulub Crater Melt Rock and Cretaceous-Tertiary Boundary Tektites
The 40Ar/39Ar ages strengthen the recent suggestion that the Chicxulub structure is the source for the Haitian and Mexican tektites and is a viable candidate for the Cretaceous-Tertiary boundary impact site.
Global cooling accelerated by early late Eocene impacts
- H. Vonhof, J. Smit, H. Brinkhuis, A. Montanari, A. Nederbragt
- Environmental Science, Geography
- 1 August 2000
At Ocean Drilling Program Site 689 (Maud Rise, Southern Ocean), δ18O records of fine-fraction bulk carbonate and benthic foraminifers indicate that accelerated climate cooling took place following at…
An extraterrestrial event at the Cretaceous–Tertiary boundary
Closely spaced samples from an uninterrupted calcareous pelagic sequence across the Cretaceous–Tertiary boundary reveal that the extinction of planktonic Foraminifera and nannofossils was abrupt…
Dinoflagellate-based sea surface temperature reconstructions across the Cretaceous–Tertiary boundary
Impact-induced mass wasting at the K-T boundary: Blake Nose, western North Atlantic
Seismic reflection data combined with results from ocean drilling document regional-scale slumping associated with the Cretaceous-Tertiary (K-T) impact event. The K-T boundary is biostratigraphically…