Sanidine spherules at the Cretaceous–Tertiary boundary indicate a large impact event

@article{Smit1981SanidineSA,
  title={Sanidine spherules at the Cretaceous–Tertiary boundary indicate a large impact event},
  author={J. Smit and G. Klaver},
  journal={Nature},
  year={1981},
  volume={292},
  pages={47-49}
}
The hypothesis that a catastrophic impact of an extraterrestrial body caused the terminal Cretaceous mass extinctions of dinosaurs, planktonic foraminfera and other species is now accepted as respectable following the discovery of a worldwide iridium enrichment in the Cretaceous–Tertiary (K–T) boundary clay1–5. In the basal lamina of the K–T boundary clay of Caravaca (Spain)7 numerous spherules were discovered composed of finely crystallized, almost pure K-feldspar in the structural state of… Expand
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Spherules associated with the cretaceous–paleogene boundary in Poland
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Petrographic criteria for recognizing certain types of impact spherules in well-preserved precambrian successions.
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