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Found 13 results

  1. 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,
  2. The below publications have to be seen to understand the enormous volume of information that they contain. Also, the number of pages listed below are correct and are not typographic errors. Spamer, E.E., 2018. A Worldwide Bibliography of the Grand Canyon and Lower Colorado River Regions in the United States and Mexico. 1535–2018. Raven’s Perch Media. 11,728 pp. Spamer, E.E., 2021. Cartobibliography of the Grand Canyon and Lower Colorado River Regions in the United States and Mexico 1535–2021. The Plains and the Rockies : a critical
  3. A number of short papers and abstracts about fossils of the Mojave Desert and Southwest US have been published as part of Changing Facies: The 2020 Desert Symposium Field Guide and Proceedings, David M. Miller, editor Desert Symposium, Inc. Web page with links to to above and other PDF files of previous Desert Symposiums They include: Two fossil accumulations in the Upper Barstow Formation, Mud Hills, Mojave Desert. by Robert E. Reynolds, pp. 57-59. Fossil-bearing facies of extensional basins: Examples from the
  4. The Great Unconformity and Tales from Arizona Field Trips A Virtual Fireside Chat with Professor Steve Marshak University of Illinois, Champaign-Urbana, October 29, 2020 More University of Illinois, Champaign-Urbana talks, 2020 Yours, Paul H.
  5. peter_robertson

    Is This An Egg?

    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!
  6. 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 ;
  7. The below classic monograph on the fossil plants of the Hermit Shale, Permian, Arizona is now available online as a downloadable PDF file. Flora of the Hermit shale, Grand Canyon, Arizona by David White Series: Carnegie Institution of Washington publication no. 405 https://www.biodiversitylibrary.org/bibliography/166069#/summary https://www.biodiversitylibrary.org/subject/Grand Canyon#/titles Yours, Paul H.
  8. Oxytropidoceras

    Paleontology of the Grand Canyon Region

    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:
  9. weezieboo

    Rock or tooth?

    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.
  10. 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
  11. The Amateur Paleontologist

    Grand Canyon Paleontology

    Hey y'all, hope you're all having a good time! This recently published report by Hodnett & Elliott (2018) describes two fairly diverse chondrichthyan faunas from the late Mississippian/early Pennsylvanian of western Grand Canyon (Arizona). The assemblages, from 2 separate formations, are described on the basis of quite many tooth specimens, and other material (i.e. denticles). Differences between those faunas and other similar-aged Euro-American faunas indicate paleogeographical implications relating to the formation of Pangaea. Hodnett,
  12. Thecosmilia Trichitoma

    Oldest known footprints in Grand Canyon found

    Oldest known footprints in the Grand Canyon found
  13. So in late June early July my wife, 2 boys (8 & 2.5), my father in-law and mother-in-law and I are going to take a 2 week road trip around the US. We'll be leaving Maryland and heading down to Memphis, Tennessee followed by Nashville then on to Texas and ending up in Albuquerque, New Mexico at my brother-in-law's for a few days, then off to the Grand Canyon, up to Dinosaur National monument, over to Hot Springs, South Dakota to the Mammoth site, Mt Rushmore, and Crazy Horse Monument, then to the Badlands in South Dakota, and then start making our way back to home. We're taking some
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