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Frenchman Mountain Dolostone: 500 million-year-old Grand Canyon rock layer finally gets a name. UNLV geologists name ancient rock layer after Las Vegas mountain that contains similar strata; research published in the journal Geosphere. New Study Links Geologic Features of Las Vegas’ Frenchman Mountain with Grand Canyon. Las Vegas Valley rock layer matches that of a famous interval of rocks at the Grand Canyon; findings reported in the Journal Geology. University of Nevada at Las Vegas, May 1 , 2020 The open access paper is: Rowland, S.M., Korolev, S., Hagadorn, J.W. and Ghosh, K., 2023. Frenchman Mountain Dolostone: A new formation of the Cambrian Tonto Group, Grand Canyon and Basin and Range, USA. Geosphere. Supplemental Material: Frenchman Mountain Dolostone: A new formation of the Cambrian Tonto Group, Grand Canyon and Basin and Range, USA, Geological Society of America Another paper is: Karlstrom, K.E., Mohr, M.T., Schmitz, M.D., Sundberg, F.A., Rowland, S.M., Blakey, R., Foster, J.R., Crossey, L.J., Dehler, C.M. and Hagadorn, J.W., 2020. Redefining the Tonto Group of Grand Canyon and recalibrating the Cambrian time scale. Geology, 48(5), pp.425-430. Related papers: Rowland, S.M., 2022, Geology of Frenchman Mountain and Rainbow Gardens, southern Nevada, USA, in Jiang, G.Q., and Dehler, C., eds., Field Excursions from Las Vegas, Nevada: Guides to the 2022 GSA Cordilleran and Rocky Mountain Joint Section Meeting: Geological Society of America Field Guide 63, p. 23– 43. Rowland, S.M., 1987, Paleozoic stratigraphy of Frenchman Mountain, Clark County, Nevada, in Hill, M.L., ed., Cordilleran Section of the Geological Society of America: Geological Society of America Centennial Field Guide 1, p. 53– 56. Hollingsworth, J.S., Sundberg, F.A. and Foster, J.R., 2011. Cambrian stratigraphy and paleontology of Northern Arizona and Southern Nevada. Museum of Northern Arizona Bulletin, 67, pp.1-321. PDFs of more trilobite papers. Videos Wild Speaker Series: The Amazing Geology of Frenchman Mountain and Rainbow Gardens. Friends Of Nevada Wilderness Frenchman Mountain Loop | Bordering Lake Mead National Nevada Trilobites, Frenchman Mountain Yours, Paul H.