This paper, based upon petrographic studies of 782 thin sections of sedimentary rocks, chiefly from New York State, describes laboratory techniques and graphic representations which place the lithology of sediments upon a quantitative basis. Microscopic (Delésse-Rosiwal) analyses, which provide the amounts of the constituent minerals, are rearranged on the principle that the kind of M. Reed, and Marguerite Smith Robertson. Many of the above were helpful in field and class discussions.

Through the courtesy of Mr. J. T. Fetherson of Cuylerville, New York, I secured a superb suite of subsurface specimens.

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