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A new formation of the Cambrian Tonto Group, Grand Canyon formally named for Frenchman Mountain
Oxytropidoceras posted a topic in Fossil News
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.- 1 reply
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I’m hoping to ID two fossils. The first fossil was found in the Boone Formation of Northwest Arkansas. My first thought is ammonite, but the spiral is much looser than what I’m seeing online. The second fossil was found 10-50 miles south of the south rim of the Grand Canyon in Arizona. It was a while ago, can’t remember exactly where I was. Both are about an inch across. Thanks for your help!
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The strange race to track down a missing billion years (The Great Unconformity)
Oxytropidoceras posted a topic in Fossil News
The strange race to track down a missing billion years Zaria Gorvett, BBC News, September 1, 2021 A billion years have vanished from the geological record – and over 152 years after this was first discovered, scientists can't agree on why. Some papers: Peters, S.E. and Gaines, R.R., 2012. Formation of the ‘Great Unconformity’as a trigger for the Cambrian explosion. Nature, 484(7394), pp.363-366. Keller, C.B., Husson, J.M., Mitchell, R.N., Bottke, W.F., Gernon, T.M., Boehnke, P., Bell, E.A., Swanson-Hysell, N.L. and Peters, S.E., 2019. Neoproterozoic glacial origin of the Great Unconformity. Proceedings of the National Academy of Sciences, 116(4), pp.1136-1145. Open access Marshak, S., Domrois, S., Abert, C., Larson, T., Pavlis, G., Hamburger, M., Yang, X., Gilbert, H. and Chen, C., 2017. The basement revealed: Tectonic insight from a digital elevation model of the Great Unconformity, USA cratonic platform. Geology, 45(5), pp.391-394. Yours, Paul H.-
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Hello! I am not a serious fossil collector, but I am always on the lookout for fossils when I am around exposed rock. I was hoping the members of this site could tell me if they thought this rock was a fossilized egg. I was struck by its shape and its texture. I photographed it in the Grand Canyon on the trail between Phantom Ranch and Cottonwood Campground. It measures about 5 inches squared. Thank you for your thoughts!
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Amniote tetrapods documented in two Pennsylvanian Grand Canyon trackways
Oxytropidoceras posted a topic in Fossil News
Discovered fossil tracks determined to be oldest known in Grand Canyon National Park ABC, Channel 15 News, Arizona The open access paper is: Rowland, S.M., Caputo, M.V., and Jensen, Z.A., 2020. Early adaptation to eolian sand dunes by basal amniotes is documented in two Pennsylvanian Grand Canyon trackways. PLoS ONE 15(8): e0237636. A related paper is: Francischini, H., Lucas, S.G., Voigt, S., Marchetti, L., Santucci, V.L., Knight, C.L., Wood, J.R., Dentzien-Dias, P. and Schultz, C.L., 2020. On the ;presence of Ichniotherium in the Coconino Sandstone (Cisuralian) of the Grand Canyon and remarks on the occupation of deserts by non-amniote tetrapods. PalZ, 94(1), pp.207-225. Yours, Paul H.-
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Spamer, E. E., 2019. Bibliography of Paleontology of the Grand Canyon Region and in the Continuity of Grand Canyon Formations. Ravem Perch Media. https://ravensperch.org/bibliography-of-paleontology-of-the-grand-canyon-region/ https://www.academia.edu/39128385/Bibliography_of_Paleontology_of_the_Grand_Canyon_Region_and_in_the_Continuity_of_Grand_Canyon_Formations https://amphilsoc.academia.edu/EarleSpamer Spamer, E.E., 1984, Paleontology in the Grand Canyon of Arizona: 125 years of lessons and enigmas from the late Precambrian to the present: Mosasaur (Journal of the Delaware Valley Paleontological Society), v. 2, p. 45-128. https://sites.google.com/site/dvpspaleo/home/the-mosasaur/Mosasaur-Vol2-1984-Spammer-GrandCanyon-45-128.pdf https://sites.google.com/site/dvpspaleo/home/the-mosasaur/ https://www.academia.edu/36824895/Paleontology_in_the_Grand_Canyon_of_Arizona_125_Years_of_Lessons_and_Enigmas_from_the_Precambrian_to_the_Present On a lighter note: Spamer, E.E., 1955. The Okamura Fossil Laboratory. The Annals of Improbable Research. v. 1, no. 4, pp. 4-9. https://www.academia.edu/36778876/The_Okamura_Fossil_Laboratory_and_Was_Darwin_nearly_right Yous, Paul H.
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Hi Folks, I've been holding onto this for years as it always looked like a tooth to me. Any help would be appreciated. I found it while hiking at the North Rim of the Grand Canyon in the 90's. Probably a rock just wanted see what others thought.
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I remember seeing Trackways in the Cocconino Sandstone as a kid in the Grand Canyon. These are not the ones I've seen before. Almost 100 years after the first paper out of the Grand Canyon is one describing an icnotaxa unexpected in the Permian desert. https://phys.org/news/2019-05-newly-fossil-footprints-paleontologists-rethink.amp
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