A subaqueous fan is a fan-shaped deposit formed beneath water (similar to deltas or terrestrial alluvial fans), and are commonly related to glaciers and crater lakes.
Subaqueous fan deposits are generally described as coarse to fine gravel and/or sand, with variable texture and sorting.
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“Anyone with any real blood in his or her ... veins cannot help being a fan ....Being a true American and being a fan are synonymous.”
—Lulu Glaser (1874–1958)