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Note on the Geology of Agattu, an Aleutian Island

1946; University of Chicago Press; Volume: 54; Issue: 3 Linguagem: Inglês

10.1086/625341

1537-5269

Robert P. Sharp,

Geology and Paleoclimatology Research

Agattu is unique among the volcanic Aleutian Islands in being composed almost entirely of well-bedded sedimentary rocks. These rocks were clearly deposited in water and are composed chiefly of amorphous silica and fine detritus derived from a volcanic terrain. Igneous rocks are sparsely represented by intrusions of porphyry, diabase, and trap. The entire island has been heavily glaciated.