Coherent masses of sand, bound together by fungal mycelia, have been found at three widespread localities in Michigan. Formation of the masses involved permeation of unconsolidated sand by fungus growing from rotting wood substrates. It is suggested that these masses may consitute precursors for concretions; that their presence in rock would indicate that the preexisting unconsolidated sediment was once in a nonaquatic environment; and that, if they were found in growth position, the masses might serve as geopetal indicators,

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