1230978
doi
10.1126/science.236.4802.705
oai:zenodo.org:1230978
Modreski, P. J.
Foord, E. E.
Shocked Quartz in the Cretaceous-Tertiary Boundary Clays: Evidence for a Global Distribution
Bohor, B. F.
info:eu-repo/semantics/openAccess
Creative Commons Zero v1.0 Universal
https://creativecommons.org/publicdomain/zero/1.0/legalcode
Shocked quartz grains displaying planar features were isolated from Cretaceous- Tertiary boundary clays at five sites in Europe, a core from the north-central Pacific Ocean, and a site in New Zealand. At all of these sites, the planar features in the shocked quartz can be indexed to rational crystallographic planes of the quartz lattice. The grains display streaking indicative of shock in x-ray diffraction photographs and also show reduced refractive indices. These characteristic features of shocked quartz at several sites worldwide confirm that an impact event at the Cretaceous-Tertiary boundary distributed ejecta products in an earth-girdling dust cloud, as postulated by the Alvarez impact hypothesis.
Zenodo
1987-05-08
info:eu-repo/semantics/article
1230977
1579527285.797177
2268892
md5:04d8e002ede73c4936ad8a687375c142
https://zenodo.org/records/1230978/files/article.pdf
public