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Science 11 July 1986:
Vol. 233. no. 4760, pp. 198 - 200
DOI: 10.1126/science.233.4760.198
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Articles
Impact Ejecta Horizon Within Late Precambrian Shales, Adelaide Geosyncline, South Australia
VICTOR A. GOSTIN 1,
PETER W. HAINES 1,
RICHARD J. F. JENKINS 1,
WILLIAM COMPSTON 2, and
IAN S. WILLIAMS 2
1 Department of Geology and Geophysics, University of Adelaide, GPO Box 498, Adelaide, South Australia 5001.
2 Research School of Earth Sciences, Australian National University, P.O. Box 4, Canberra, Australia 2600.
A solitary layer of shattered crustal rock fragments has been traced over a distance of 260 kilometers within folded 600-million-year-old Precambrian marine shales of the Adelaide Geosyncline, South Australia. The fragments consist entirely of acid to intermediate volcanics (approximately 1575 million years old) displaying shattered mineral grains, shock lamellae in quartz, and small shatter cones. Fragments reach 30 centimeters in diameter and show evidence of vertical fall emplacement. Available evidence points to derivation of the rock fragments from a distant hypervelocity impact into the Gawler Range Volcanics at Lake Acraman, approximately 300 kilometers west of the Adelaide Geosyncline.
Submitted on December 2, 1985
Accepted on April 8, 1986
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