Thickness of 1-5 cm. Consists of a yellowish-gray silt- and clay-size material and a small amount of fine-grained sand. Distinctive features include the small glass content (33-55%), considerably large plagioclase content (24-28%) and 8-10% lithic debris. In addition to pyroxenes, the ash also contains green (9%) and brown (6%) hornblendes.
Volcanic ashes of Adak Island, Aleutian Islands, Alaska [Vulkanicheskiye peply na o-ve Adak (Aleutskiye o-va, SShA)]
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