Bryan, J.J., 1934, Pyrite concretions from the Chuar: Grand Canyon Nature Notes, v. 9, p. 350-353. Authors Bryan, J.J. Publication Date 1934 Citation Grand Canyon Nature Notes, v. 9, p. 350-353. State AZ Province CP County CN MO Keywords Sedimentary Petrology More Keywords Sedimentary Petrology, Chuar Group - Grand Canyon Supergroup - Late Proterozoic, AzGeoBib RefNum 1404