DIAGENETIC ORIGIN OF GRAYWACKE MATRIX MINERALS: A DISCUSSION.

Studies the regional and local variation in the mineralogy of the sandstones of the Eocene Tyee Formation, Oregon Coast Range. Differences in depositional conditions of sand grains; Assertion on the indecisiveness of the petrographic evidence for the origin of sandstone matrix; Three main lines of evidence supporting the notion that thin sections that the rock fragments in the low-matrix sample have altered mineralogically following burial.