| Abstract: | Shocked quartz grains displaying planar features were isolated from Cretaceous-Tertiary boundary days 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. |
| Genre: | Article |
| ProdID: | 70014886 |
| Citation Author: | Bohor, B. F.; Modreski, P. J.; Foord, E. E. |
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| Citation End Page: | 709 |
| Citation Issue: | 4802 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 5 |
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| Citation Search Results Text: | Shocked quartz in the cretaceous-tertiary boundary clays: Evidence for a global distribution; 1987; Article; Journal; Science; Bohor, B. F.; Modreski, P. J.; Foord, E. E. |
| Citation Start Page: | 705 |
| Citation Volume: | 236 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Shocked quartz in the cretaceous-tertiary boundary clays: Evidence for a global distribution; 1987; Article; Journal; Science; Bohor, B. F.; Modreski, P. J.; Foord, E. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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