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Science 18 October 1963:
Vol. 142. no. 3590, pp. 379 - 381
DOI: 10.1126/science.142.3590.379
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Articles

Coesite and Shocked Quartz from Holleford Crater, Ontario, Canada

T. E. Bunch 1 and Alvin J. Cohen 2

1 Mellon Institlute, Pittsburgh
2 Department of Earth and Planetary Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania

The Holleford Crater, a circular depression in southern Ontario, is filled with Paleozoic sediments and underlain by brecciated Precambrian igneous and metamorphic rocks. The presence of coesite in two core samples of this breccia has been established by petrographic and x-ray diflraction methods. Shattered quartz in the coesite-bearing samples exhibits planar fractures. The shocked quartz is the result of great shock pressures and the association of coesite with the shocked quartz strongly suggests that Holleford Crater originated from a hypervelocity impact.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
The Rock Elm meteorite impact structure, Wisconsin: Geology and shock-metamorphic effects in quartz.
B. M. French, W. S. Cordua, and J.B. Plescia (2004)
Geological Society of America Bulletin 116, 200-218
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Science. ISSN 0036-8075 (print), 1095-9203 (online)