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Found 224 results

  1. This one is kind of artsy

    The footprint in the lower right is chirotherium. The straight line looks to be a tail drag. The squiggly lines are mud cracks I assume.
  2. Phytosaur tooth

    I just bought this phytosaur tooth. Species: maybe Machaeroprosopus Age: Upper Triassic LOCATION Private Ranch, Northeast Arizona FORMATION Chinle Formation
  3. Morning footprint finds

    The first picture is a Rotodactylus that has all five toes. The little one at the bottom center is sort of oval shaped and sticks out an angle. Second picture I have no idea. The print on the far right center looks like it has stubby little toes.
  4. Very nicely defined footprints

    Found this rock with some nicely defined footprints. The first two pictures are of the same print - has a great impression of the ball of the foot.
  5. Found a variety of toes today

    This rock has a nice variety of prints with varying number of toes. The bottom center has two toes, the left has three. The upper right is a very distinct print but I can’t tell if there is is a fourth toe to the right of the three long ones.
  6. Chirotherium prints with scale

    Here are some of the various sizes of the chirotherium footprints.
  7. Some footprints with scale

    Here are some closeups with scale (inches). It looks to me like there are some two toe and some three toe prints u
  8. Some more new footprints

    The first picture looks like a different print than what I’ve found before - the toes are much wider spread than the chirotherium and there seems to be only three toes, not four. The second picture shows an interesting pattern in the rock. The third has front and rear prints.
  9. Strange footprint

    Spent most of the day dragging out garbage rocks but found this one. Can’t tell if it’s a smeared Chirotherium or some thing else. All you Lady Gaga Little Monsters, paws up!
  10. New type of footprint

    The rock I recovered today has a new type of footprint I haven’t seen before (first picture) as well as a couple of nice chirotherium.
  11. 7.5 foot slab of footprints

    Pulled this 7.5 foot slab out today. A lot of the prints are faint but some nice clear ones.
  12. Still finding footprints

    Over 30 big slabs recovered now. Found a nice one with three Chirotherium strides - front and rear feet.
  13. Found this nautiloid. Preservation not so great (but you can see septa) but the colors are awesome!
  14. A ‘Jurassic Park’ icon was so much different in real life, BRG_Com https://bgr.com/2020/07/08/dilophosaurus-jurassic-park-study/ Famous Jurassic Park Dinosaur Was More Powerful than Previously Thought, Sci News, July 9, 2020 http://www.sci-news.com/paleontology/dilophosaurus-wetherilli-08620.html The paper is: Marsh, A., & Rowe, T. (2020). A comprehensive anatomical and phylogenetic evaluation of Dilophosaurus wetherilli (Dinosauria, Theropoda) with descriptions of new specimens from the Kayenta Formation of northern Arizona. Journal of Paleontology, 94(S78), 1-103. doi:10.1017/jpa.2020.14 https://www.cambridge.org/core/journals/journal-of-paleontology/article/comprehensive-anatomical-and-phylogenetic-evaluation-of-dilophosaurus-wetherilli-dinosauria-theropoda-with-descriptions-of-new-specimens-from-the-kayenta-formation-of-northern-arizona/39C2921EDC6E951AC9F94A22158CA4E5 Yours, Paul H.
  15. Simple Geode or Geodized Fossil

    A very odd rock found by my wife in Arizona as a child. Exact locality unknown. Lots of textures. There are some pretty long crystals in the cavities. Could this be a geodized fossil? If so, what kind? It doesn’t really look like pictures of geodized cephalopods or crinoids. Thanks!
  16. Recovered footprints

    So I got the footprints out of the wash before the monsoon arrives. Still haven’t figured out what the little prints are from. Anyone have info? Lots of nice chirotherium prints.
  17. Found in Limestone Canyon

    Hello! I am wondering about a couple of fossils found in Yavapai County, Arizona, approximately 30km south of Ashfork, Arizona. I chose this canyon to explore because on another website I saw mention of Arthrodire plates having been found in a quarry here. That site listed those plates being found in the Devonian Martin Formation. Well, after some research I figured out that the quarry was associated with Drake Cement Plant, which is perched on the edge of a canyon called Limestone Canyon. So off to the canyon my son and I went. This canyon had several distinctly different limestone layers, but the deepest layer, exposed on the canyon floor, had a variety of these (most pics taken in the field). Most were in large slabs of rock, but we found a couple smaller pieces that we brought home. We are dissolving one in Muriatic Acid out of curiosity, and it is revealing a "ring" of fossilized material. Can anyone tell me what these are? My son is quite curious to know. Thank you for any help!
  18. ARIZONA FOSSIL ADVENTURES By Chris Schur Exploring the Winkelman Red Brachiopod Site. On Highway 77, one mile north from the turnoff to Winkleman is one of the most awe inspiring scenes to be found in Arizona. Here, the road cuts through a vaulted limestone canyon hundreds of feet deep, with the multihued layers clearly visible. At this location lies an old quarry on the north side of the road which cuts right into the Paleozoic Naco limestone cliffs. This February, we visited this site with some paleo friends to examine the fauna present and determine the suitability for future outings. We found that large boulders of limestone littered the bottom of the old abandoned quarry, which were once part of the surrounding cliffs. A hundred feet or so into the man made canyon, the limestone boulders contain bright red chertized fossil casts of several types of brachiopods, crinoids and bryozoans. Also present everywhere are worm burrow trace fossils, found in a spectacular violet hued limestone matrix. Description of fauna present: Brachiopods. Two types of marine brachiopods are abundantly preserved in red chert. The first type, a small Spirifer ranges in size from less than a quarter of an inch upwards to over an inch. This is by far the most desirable, but less common of the two brachs seen here and are usually preserved as complete three dimensional casts with limestone filled centers. The second and far more common is an unidentified rounder heart shaped brachiopod. With sizes ranging from one half to two inches in diameter, including many large and fragmented shell pieces. The wall is thin, and the center also filled with limestone, so one must be careful in using acid to extract the delicate red or pink chert specimens, or they will fall apart. Crinoids. This site contains some of the largest crinoid stems I've ever seen. While most are 3/8 of an inch in diameter, we found many much larger. The really big ones were nearly an inch in diameter, with a small rounded five point star shaped central canal. Countless smaller stems are seen as well, forming much of the grey colored limestone matrix itself, often referred to as "crinoidal limestone". Some of the largest ones however were preserved in red chert, and several one to three inch long specimens were retrived. Bryozoans. Two types of "moss animals" were found here. The common net like Fenestrellina types were abundant, filling in the spaces in the limestone matrix with mostly small fragments. The second, and much more common type was a small branched animal, usually preserved as a black film on many of the loose limestone boulders in the bottom of the canyon. Trace Fossils. On the visible surfaces of many of the large boulders in the bottom of the canyon are the trace remains of hundreds of channels and tunnels in the fossilized ocean bottom from burrowing invertebrates typical of mid to late Paleozoic time periods. On many of the exposed surfaces of the limestone, we can see one to two inch diameter trails where the animal tunneled through the muddy bottom crossing and passing through the tunnels of others as well. Often we see and entire block of violet hued limestone with burrows passing through the stone, filled in with white limey sediment, layer upon layer as the sea bottom slowly filled in with more mud. Cross sections of the burrows are oval in shape, and typically an inch tall, and 1 1/2 inches wide. As for a possible animal that formed the burrows, the fossil record here does not preserve any mollusk or crustacean large enough to have made them, indicating that either it was a soft bodied animal that did not fossilize or a crustacean whose chitinous outer exoskeleton that dissolved or fell apart soon after death and prevented fossilization as well. A useful observation is that within the violet limestone matrix containing the burrows, we find many of the red chertized brachiopods intermixed. This indicates that the red brachs coexisted with the burrowing animals and shared a common ecosystem. Extraction of the Fossils. When you visit this site, be prepared to do a bit of hard rock quarrying to remove the good specimens. Because this site has been known for years, don't expect to pick up small pieces of limestone matrix and have them filled with choice specimens! The best specimens will have to be removed with hammer and chisel from the large limestone blocks. We have found that a standard geological pick is not enough to extract the material. The best tool is a heavy duty 1/2 to 1 inch diameter masonry cold chisel and a heavy hand sledge. Also mandatory will be a good pair of safety glasses to deflect flying shards of matrix, and a pair of work gloves to protect your hands. Remove the prospective fossil by chiseling a deep channel around it, keeping at least an inch away from the delicate red chert. When the channel is at least an inch deep, you can pop it off with one swift blow, or work around the base with a smaller chisel. Once the specimen and surrounding matrix is removed, the fossil can either be displayed as is, or removed from the matrix. While mechanical preparation works well here, some success with smaller specimens can be had by dissolving the limestone with acid. For most small pieces, vinegar works well, remove only the outside material but do not leave in too long because many of the larger brachiopods are filled in the center with limestone which helps support the fragile shell material. Muriatic acid that has been diluted with water works faster, but should only be used under adult supervision. The large crinoid stems come out particularly well with the acid treatment, leaving a hollow center in the stems. Further explorations. We have not been further up the canyon, however there is no doubt that the best and freshest specimens will lie in the rugged cliffs beyond the collection site. While such a hike should not be attempted by the inexperienced, prepared fossil hunters may uncover a rich bounty of more red chertized fossils in the walls beyond. The Pennsylvanian Naco limestone contains in other parts of the state some of the best brachiopod fossils to be had, along with plentiful bryozoans and other interesting marine invertebrates. Other layers of limestone contain no apparent fossils at all. But it is the lure of the ancient sediments that push the fossil hunter onward, always hopeful that next discovery could be just around the corner! For furthur reading on this spectacular area, refer to USGS Bullitin 176 highway road log by Wess Pierce. I wish to thank Tom McGarvin of the Geological Survey office in Tucson for helping with the identification of the sites age.
  19. Kaibab Sponges & Other Fossils

    I took my first long trip (more than 15 minutes) to search for Permian fossils in the Kaibab Limestone of central Arizona near Pine. I have previously only collected silicified fossils that had been transported south of the Mogollon Rim by streams. The Kaibab is known for two silicified fossils that are great index fossils for the Leonardian (Kungarian) Age across western US: Peniculauris bassi, a brachiopod and Actinocoelia maeadrina, a sponge. At first I was disappointed because I have heard that you could collect hundreds of each type in a short period of time. However I found a couple of sponges with the best 3 D texture that I have seen on the internet. They each are each about 13 cm in length. I will take quality over quantity any day. The Peniculauris bassi brachiopod is about 5 cm wide. I also found some very detailed echinoid spines (3.5 cm field of view). I will have to go back to the top of the Rim to collect more types of fossils. I only have a few hundred square miles of Kaibab to search, exclude that near the Grand Canyon. Good reference on Actinicoelia maeadrina: Griffin LR (1966) Actinocoelia maeandrina Finks, from the Kaibab Limestone of northern Arizona. Brigham Young Univ Geol Stud 13: 105–108 http://geology.byu.edu/home/sites/default/files/actinocoelia-maeandrina-finks-from-the-kaibab-limestone-of-northern-arizona-leland-r.-
  20. bone fragment? Flagstaff, Arizona

    I found this and initially thought it was uniquely shaped petrified wood. We have found a lot of petrified wood in the same spot. However, all of the wood that I have found has some evidence of tree rings in the cross section. This does not. The "bottom" or blunt end, looks more like worn bone to my untrained eye. I know that identifying what kind of bone will be impossible, but I am just looking for confirmation that it is indeed bone, and not petrified wood, or just a strange mineral structure in rock. It was found near the Little Colorado River, near Gray Mountain, Arizona, which is about 45 mins north of Flagstaff, AZ. It was found on the surface. We have found what we believe are coprolites with very well preserved seeds in the same exact spot. Thank you for any help!
  21. Help ID radial pattern

    Hello, I found this rock this morning behind my house and I'm drawing a blank as to what it could be. There are lots of brachiopods, bivalves and gastropods in this particular area but nothing that matches this. It kinda looks like an end view of a coral but I only find those about a mile away and not preserved like this. Any ideas would be appreciated. Thanks for looking. Northern Arizona, Mississippian, Redwall Limestone, Mooney Member.
  22. Help me with Pine AZ Fossil ID???

    This is a piece about 2 inches wide. It is Carboniferous limestone in Northern AZ, but I do not recognize the branched, leafy fossil. Any help?