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Found 55 results

  1. Morrison Formation yields remains of predatory insect. Utah State Parks Blog, Vernal, Utah https://stateparks.utah.gov/2020/05/20/famous-dinosaur-producing-rocks-in-utah-yield-fossil-of-large-predatory-insect/ Jurassic bug: Researchers find 151-million-year-old Morrisonnepa Jurassica insect fossil in Utah by Jordan Culver, USA TODAY, May 22, 2020 https://www.usatoday.com/story/news/nation/2020/05/21/morrisonnepa-jurassica-151-million-year-old-bug-fossil-utah/5234187002/ the paper is: Lara, M.B., Foster, J.R., Kirkland, J.I. and Howells, T.F., 2020. First fossil true water bugs (Heteroptera, Nepomorpha) from Upper Jurassic strata of North America (Morrison Formation, southeastern Utah). Historical Biology, pp.1-9. https://www.tandfonline.com/doi/abs/10.1080/08912963.2020.1755283 Yours, Paul H.
  2. Foster, J., Pagnac, D. and Hunt-Foster, R., 2020. An unusually diverse northern biota from the Morrison Formation (Upper Jurassic), Black Hills, Wyoming. Geology of the Intermountain West, 7, pp.29-67. DOI: https://doi.org/10.31711/giw.v7.pp29-67 https://giw.utahgeology.org/giw/index.php/GIW/article/view/69 PDF: https://giw.utahgeology.org/giw/index.php/GIW/article/view/69/87 Yours, Paul H.
  3. Dinosaur Bone

    My family owned private land near garden park in Canon City, Colorado. This is a couple of pieces that were found there. I'm just curious on what body part they may be.
  4. There is a revised edition of John Foster's book Jurassic West: The Dinosaurs of the Morrison Formation and Their World coming out this fall: https://www.amazon.com/gp/product/0253051576/ref=crt_ewc_title_dp_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER When this volume is released, it will include updates to knowledge of Morrison tetrapods, including the renaming of Amphicoelias fragillimus as Maraapunisaurus, the renaming of Stegosaurus longispinus as Alcovasaurus, the renaming of Diplodocus hayi as Galeamopus, the reclassification of Diablophis as a basal snake, the renaming of the DNM Camptosaurus as Uteodon, and the erection of Dryosaurus elderae for the DNM Dryosaurus.
  5. An interesting article that discusses the “Golden Age” of sauropods, the Morrison Formation is reported to have yielded 13 genera and 24 species of sauropods. For collectors makes identification of teeth a pretty daunting task... Paper. https://giw.utahgeology.org/giw/index.php/GIW/article/view/42
  6. Hi, I saw this tooth for sale and i am wondering if it looks like it could be a Ceratosaurus tooth. I read something about Ceratosaurus teeth having vertical ridges on the inner crown so i think it could possibly be a good match. It is .75 inches long and comes from the Morrison Formation in Wyoming. Thanks.
  7. I have found this crinoid ossicle from the Morrison Formation seems to be agatized alot like the bone from the formation does anyone know of any others found from the Morrison? have looked online but cant find anything even articles talking about it.
  8. I have researched for a while now on these bones i have in my collection and only thing i can find that is pretty close to what i have are sauropod metatarsals. Can anybody maybe confirm this or what they may be from? The 3D models are very accurate i put the measurements on the 3d models just click on the annotations. They are from the morrison formation here in Colorado, thanks to anybody that can help! 1st bone: 2nd bone:
  9. Hi I found this and was wondering if the ID was right. Just trying to improve my knowledge on fossils. It doesn’t look Theropod in origin, considering it doesn’t have the honeycomb texture of a Theropod fossil, Thank you!!
  10. A very long time coming, over a decade in discussion, Allosaurus jimmadseni has finally been described in the attached OPEN paper The abstract says it best "Allosaurus is one of the best known theropod dinosaurs from the Jurassic and a crucial taxon in phylogenetic analyses. On the basis of an in-depth, firsthand study of the bulk of Allosaurus specimens housed in North American institutions, we describe here a new theropod dinosaur from the Upper Jurassic Morrison Formation of Western North America, Allosaurus jimmadseni sp. nov., based upon a remarkably complete articulated skeleton and skull and a second specimen with an articulated skull and associated skeleton. " https://peerj.com/articles/7803/ National Park Service article https://www.nps.gov/dino/learn/nature/allosaurus-jimmadseni.htm Article https://phys.org/news/2020-01-species-allosaurus-utah.html Collectors For those of us that collect teeth I'm sure that these teeth are indistinguishable from other Allosaurus species like Allosaurus fragilis and all teeth should all be identified as Allosaurus sp. including bones. Also please do not get taken by sellers claiming to offer Allosaurus jimmadseni teeth. Unless one comes off an identifiable skull its bogus.
  11. Allosaurus

    So this tooth i have was labeled by the seller as an Allosaurus premax tooth. The tooth is still in the matrix and the tip of it has broken off. The tooth measures 15/16 " long and is from the morrison formation ( bone cabin quarry ) in wyoming.
  12. Quick guide to help identify a few Sauropod teeth from the Morrison Formation. Corrections and additional info always appreciated Please Note: Variations in the morphology of these teeth can vary significantly do to, species, jaw position and ontogenetic changes. This is just a high level guide. Camarasaurus: - Crown is wider than the root - Anterior Teeth are spoon-like and symmetrical, mid and posterior teeth are asymmetrical - The crown enamel ends sharply where the root begins - Wear facet, if present, can be on both sides of the tip From my collection 14.5 cm long and 7 cm long Jaw mechanics showing wear facets Brachiosaurus - Crown are only slightly wider or equal to their root - Teeth are intermediate between spoon-like and peg-like depending on jaw position - The crowns typically have an axial twist relative to the root - Crowns are Conical and Chisel-Shaped - Wear facet, if present, is sharp and at the tip but almost always pointed - The crown enamel blends into the root area. Not has sharp of a cutoff as Camarasaurus From my collection 9.5 cm long From the collection of @hxmendoza from a previous post Jaw mechanics showing wear faceting Diplodocus - Peg-like teeth long and narrow - Slightly curved teeth - Crown enamel blends slightly into the root Jaw Mechanics of Diplodocus showing wear faceting From Supplier, Paleo Gallery Apatosaurus Dont have much published on teeth but from examining ones in my collection they appear to be faceted, grooved toward the base some more than others with sharper edges. More compressed than Diplo. Provided by hxmendoza on a previous post, he made similar comments From Paleo Gallery you can see the faceting References 1) Tooth Replacement of Euhelopus zdanskyi (Dinosauria: Sauropoda) and the Evolution of Titanosaurian Tooth Morphology, Sept 2014 Salakka, Seela 2) Jaw mechanics in sauropod dinosaurs, Jan 1994 Jorge Calvo 3)The dentition of a well-preserved specimen of Camarasaurus sp .: implications for function, tooth replacement, soft part reconstruction, and food intake. NOV 2016 Kayleigh Wiersma P. Martin Sander @Masp hope this helps
  13. What Fossils Alone Can’t Explain About Dinosaurs When time is measured in 10-million-year blocks, the lines between ecosystems and animals that would never have coexisted can get blurry. Laura Poppick, The Atlantic, August 17, 2019 https://www.theatlantic.com/science/archive/2019/08/paleontology-precision-problem/596176/ Yours, Paul H.
  14. Mission Jurassic - "Badlands" of North Wyoming Children's Museum of Indianapolis - BBC News https://www.bbc.co.uk/news/extra/nxVbFidDbs/mission-jurassic Yours, Paul H.
  15. These finds were reported a while back and this paper describes the finds. These two partial skeletons from Montana represent the northernmost occurrences of Stegosauria within North America ever recovered from the Morrison Formation http://app.pan.pl/article/item/app005852018.html
  16. A Few Small But Cool New Dino Fossils

    We have been working primarily on our shark program material but we did add a few new dinosaur fossils. For the most part they are pretty small in size but add quite a bit to the education we do. These represent some iconic and scientifically important dinosaurs. In addition to these small fossils, we added a 6" Trike frill piece from HC, a smaller piece of a Horseshoe Canyon Ceratopsian frill, and a 2.5" Hadro vert from that formation. These are excellent touch fossils so I am happy ! The small fossils are..... Dromaeosaurus sp. Judith River. I big thank you thank you to @Troodon for some ID help. This is a really nice tooth and I am really excited about this one. We can get into some fun science about the study of tooth wear in determining what dinosaurs ate.
  17. Many of us collect material from the Morrison Formation especially teeth and claws. Not much is published to help us identify these items but this new paper gives us some insight into a new Troodontid that includes teeth and claws, Hesperornithoides miessleri https://peerj.com/articles/7247/ The serrations on the mesial carinae of maxillary teeth are smaller than the distal serrations as in basal dromaeosaurids. Mesial serrations are restricted to the apical third of the crown and appear absent in some teeth. Serrations are small (5.5 per mm distally)
  18. Does anyone have a copy of the following paper: Michael D. D'Emic Â& Matthew T. Carrano (2019) Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA. The Anatomical Record (advance online publication) doi: https://doi.org/10.1002/ar.24198 https://onlinelibrary.wiley.com/doi/10.1002/ar.24198
  19. Fossil or not?

    Found this rock on our place in southwest Colorado. It’s very different from most rocks here. With a little research I found we are located in the middle of the Morrison Formation! I’m interested to see if anyone could help identify it. Fossil or cool rock? Thanks for your input.
  20. Allosaurus tooth

    From the album Theropods

    From the Carnosauria group which ran from the Jurassic to Cretaceous came a fearsome theropod known as Allosaurus. These Jurassic age teeth were hand collected by our curator at the Museum of Ancient Life in Lehi, Utah during his visits to the Jurassic aged Bone Cabin Quarry within the Morrison Formation (Wyoming) around the fossilized skeleton of a Barosaurus Sauropod. It is believed that one or more Allosaurus was scavenging from the carcass. Crocodile teeth have also been recovered from the site. To this day these prized teeth worth hundreds if not thousands of dollars remain in the curators private collection.
  21. Allosaurus tooth

    From the album Theropods

    From the Carnosauria group which ran from the Jurassic to Cretaceous came a fearsome theropod known as Allosaurus. These Jurassic age teeth were hand collected by our curator at the Museum of Ancient Life in Lehi, Utah during his visits to the Jurassic aged Bone Cabin Quarry within the Morrison Formation (Wyoming) around the fossilized skeleton of a Barosaurus Sauropod. It is believed that one or more Allosaurus was scavenging from the carcass. Crocodile teeth have also been recovered from the site. To this day these prized teeth worth hundreds if not thousands of dollars remain in the curators private collection.
  22. Allosaurus tooth

    From the album Theropods

    From the Carnosauria group which ran from the Jurassic to Cretaceous came a fearsome theropod known as Allosaurus. These Jurassic age teeth were hand collected by our curator at the Museum of Ancient Life in Lehi, Utah during his visits to the Jurassic aged Bone Cabin Quarry within the Morrison Formation (Wyoming) around the fossilized skeleton of a Barosaurus Sauropod. It is believed that one or more Allosaurus was scavenging from the carcass. Crocodile teeth have also been recovered from the site. To this day these prized teeth worth hundreds if not thousands of dollars remain in the curators private collection.
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