Reports

Eocene Volcanism and the Origin of Horizon A

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Science  09 Apr 1971:
Vol. 172, Issue 3979, pp. 152-154
DOI: 10.1126/science.172.3979.152

Abstract

A series of closely time-equivalent deposits that correlate with seismic reflector horizon A exists along the coast of eastern North America. These sediments of Late-Early to Early-Middle Eocene age contain an authigenic mineral suite indicative of the alteration of volcanic glass. A volcanic origin for these siliceous deposits onshore is consistent with a volcanic origin for the cherts of horizon A offshore.