Thickness of 0.5 to 1 cm. Consists of pink silt- and clay-size ash. Thickness of the layer and the particle size are invariable in all sections. Distinctive features of mineral composition are a considerably high glass content (64%), significant content of green hornblende (6%), and the presence of brown hornblede (3%) and pyroxenes (1%). Total amount of glass and plagioclase is as large as 80%.
Volcanic ashes of Adak Island, Aleutian Islands, Alaska [Vulkanicheskiye peply na o-ve Adak (Aleutskiye o-va, SShA)]
This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G19AC00060 and G19AC00171.
Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.