Abstract
ABSTRACT An unusual conglomeratic sandstone lens occurs in the Pilcher Quartzite in western Montana. Clasts in the lens are very angular cross-laminated quartzarenites which are texturally and mineralogically identical to the surrounding matrix sandstones. Ice cementation of loose sand, differential thawing, and burial of the resulting ice-bound blocks is suggested as a mechanism for the development of this novel conglomeratic lens.
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