L. F. Noble: A section of the Paleozoic formations of the Grand Canyon at the Bass trail. In: Geological Survey Professional Paper. Band131, 1923, ISSN0096-0446, S.B23–B73, doi:10.3133/PP131B.
George E. Gehrels1, Ron Blakey2, Karl E. Karlstrom, J. Michael Timmons, Bill Dickinson, and Mark Pecha: Detrital zircon U-Pb geochronology of Paleozoic strata in the Grand Canyon, Arizona. In: Lithosphere. v. 3; no. 3, 2011, S.183–200, doi:10.1130/L121.1 (geoscienceworld.org [PDF]).
geoscienceworld.org
pubs.geoscienceworld.org
George E. Gehrels1, Ron Blakey2, Karl E. Karlstrom, J. Michael Timmons, Bill Dickinson, and Mark Pecha: Detrital zircon U-Pb geochronology of Paleozoic strata in the Grand Canyon, Arizona. In: Lithosphere. v. 3; no. 3, 2011, S.183–200, doi:10.1130/L121.1 (geoscienceworld.org [PDF]).
zdb-katalog.de
L. F. Noble: A section of the Paleozoic formations of the Grand Canyon at the Bass trail. In: Geological Survey Professional Paper. Band131, 1923, ISSN0096-0446, S.B23–B73, doi:10.3133/PP131B.