Excavation of Dinosaur National Monument Quarry, 1923.

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    Local number: SIA2011-1419

    Summary: RU 424 Box 7 Lantern Slide Box 22. Excavation of Dinosaur National Monument Quarry, 1923. From black and white lantern slides found in the Division of Vertebrate Paleontology Records.

    Repository: Smithsonian Institution Archives

    View more collections from the Smithsonian Institution.

    1. ktneprac 18 months ago | reply

      The image is not Dinosaur National Monument, but is the Alamosaurus site on North Horn Mountain (UT). The large flat bone looks like the scapula and the rounded objects look like the rounded centra of the caudal vertebrae. As further proof, compare the hats in this image with those worn in Plate 4, fig. B, Gilmore 1946, Reptilian fauna of the North Horn Formation of central Utah. US Geological Survey Professional Paper 210-C available through Google Books.

    2. Smithsonian Institution 18 months ago | reply

      Thank you, ktneprac, for all of this detailed information. I wasn't able to access the full text of Reptilian fauna of the North Horn Formation of central Utah on Google Books. Is there another photo online of the Alamosaurus site on North Horn Mountain in Utah that we can compare this image to? This slide was not labeled. The information about Dinosaur National Monument came from the finding aid from this collection which can be found here siarchives.si.edu/collections/siris_arc_216991 (scroll down to box 7). I will forward these links to the Department of Paleobiology to see if someone in that department knows more about the origin of these slides. Thanks again for your comment.

      Sonoe
      Field Book Project

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