title: Geochemistry of Graywackes and Shales.
abstract: Sixty-nine graywackes and 33 shales were analyzed spectrographically for 14 minor elements to illustrate the variation of composition within a graywacke bed, between beds in one section, between sections, and between formations. Analyses of several fractions of a graywacke indicate what each contributes chemically to the rock.
authors.forename: J N
authors.initials: JN
authors.lastname: Weber