The Miocene clastic rocks of southwest Espiritu Santo, among which rudites are predominant, consist of lava-derived and organic calcareous constituents in all proportions. Their composition and texture indicate that marine andesitic volcanoes were their source. The salient characteristics of the marine andesite volcano and its environs as a sedimentary system are reviewed, and the genesis of the Santo clastic rocks is discussed in the light of this review.

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