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Found 10 results

  1. MarcoSr

    Petrified Wood Slabs

    I'm interested in petrified wood for the scientific value (wood where the cell structure is well preserved), for the aesthetic value (mineralized with vivid colors and crystal shapes), and for oddities (like fungus, insect borings etc.) contained in the wood. Below are three petrified wood slabs, from the United States, from my collection. The below individual slab pictures were taken with the slabs dry, indoors using my camera with flash. The close-up pictures were taken with my Dino-Lite digital microscope. If you want to see a lot more of the petrified wood pieces in my collection, check out my TFF thread at the below link: Petrified Wood, conifer, fungus Polyporites wardii, early Permian late Triassic 295 to 201 MYA, Chinle Formation, northern Arizona - 3.60 lbs. 10.5x8.75x0.53 inches Traditionally this petrified wood has been identified as Araucarioxylon arizonicum, a conifer tree. However,according to Wikipedia “ The validity of the name Araucarioxylon arizonicum has been questioned. A. arizonicum may actually be composed of several different genera and species. A 2007 study on the syntypes used by Knowlton in describing the species has revealed that they belonged to three species. They were tentatively reclassified as Pullisilvaxylon arizonicum, Pullisilvaxylon daughertii, and Chinleoxylon knowltonii. The genus Araucarioxylon may thus be superfluous and illegitimate; and the petrified logs of Petrified Forest National Park may be composed of a greater diversity than initially believed.” What makes this slab unique are the oval shaped patterns framing and permeating the piece, which are actually the fossil remains of a fungus (named Polyporites wardii), that invaded the ancient tree before it was fossilized. The fungus is preserved in barite (fungus is almost never seen because it doesn't preserve in silica the way wood does). Petrified Wood, Triassic 225 MYA, Chinle Formation near Holbrook, Arizona - 745g 160 x200x12mm This slab has incredible colors (purple, red, orange, yellow etc.) which is a major reason why Arizona petrified wood is highly desired by petrified wood collectors. Petrified Wood, early Eocene 50 MYA, Green River Formation, Blue Forest along ancient Lake Gosiute, Sweetwater County, Wyoming - 1.2 lbs. 8.5x6x.38 inches This slab has really nice wood preservation with a very well defined heart in the center and stunning wood grain. There is blue agate, with golden calcite filling some of the agate voids, some nice insect borings, as well as fossil ostracods near the rind. Per Viney 2020 The Blue Forest of Ancient Lake Gosiute Sweetwater County Wyoming “The lacustrine setting in which the silicified wood formed is contrasted with two geologic environments commonly associated with silicified wood deposits, trees transported by streams and rivers buried in fine-grained fluvial sediments of deltas and floodplains as well as lahars and ash produced from volcanic eruptions that bury trees. A recent scientific study of the Blue Forest fossil wood reveals that preservation occurred as a multistage mineralization process. The taphonomic sequence that included stromatolitic growth followed by wood desiccation and then exposure to mineral-laden waters is consistent with a playa-lake model for Lake Gosiute.” Marco Sr.
  2. Not knowing petrified Wood species well, I searched the web and specifically TFF and came upon Marco Sr.'s fabulous thread and collection of pet.wood. I only have a few pieces and all are close enough in appearance to be the same species, if I'm guessing correctly. And that would be Pullisilvaxylon arizonicum. Anyone have a confirmation or another correct species? Thanks, Steve I cut 3 or 4 slabs off and gave the large piece to my son. He moved into a house his uncle bought for the college kiddos to be closer the University and left it behind so I snagged it for the pics and ID.
  3. Othniel C. Marsh

    Phytosaur tooth

    Below is an unidentified phytosaur tooth from the Norian of the Chinle Formation which I've been struggling to identify to a genus or species level. Thanks in advance for any proposed ID's Othniel
  4. Hi everyone! I recently uploaded a pair of expedition videos to YouTube from my September trip to some late Triassic beds in northern Arizona. If you're an old school Walking With Dinosaurs fan, you may be interested to know that this spot is quite close geographically to the famed Placerias Quarry whose fossils were hugely influential in the making of Episode 1, "New Blood". I, and I suspect many of you as well, found WWD and its spinoffs to be easily the most captivating natural history documentaries of their time, and I credit its opening act taking place in my home state as playing an influential role in why I ended up in this field of study. I spend more of my time these days working in Cretaceous rocks than anything else, so coming back to the Triassic is something of a homecoming for me. Fossils at this locality are abundant but frequently in rough shape, since they begin to erode and fragment while still several inches below the surface. Teeth, like the phytosaur crown above, hold up better and are usually among the best finds of each trip. I also collected some fragments of metoposaur skull or clavicle (watch the second video in particular if you're interested in these guys!) but I will hold off until I've finished gluing the pieces together before sharing here. 😉 While large stretches of Chinle beds in northern Arizona are now federally protected under Petrified Forest National Park, these protected areas do not extend over the entirety of Arizona's late Triassic province. A short walk away from where I collected fossils is this massive excavated pit that has cut down through the fossil-bearing layers. This burial site of over 200 million years will soon become a landfill for human waste. I think this is an important reminder of why we collect fossils in the first place: 'everything not saved will be lost'.
  5. Found this in the Chinle Formation outside Moab, Utah. About 3/4" (19mm) long and 1/4" (6mm) wide at the base
  6. kgbudge

    Burrow cast in Chinle Formation

    Trace fossils aren't always as exciting, but I like the ones I've found. This looks like a burrow cast. From the "mottled member" of the Chinle Formation, Temple Mountain, San Rafael Swell, Utah, US. Posting also to check my identification. My references indicate that the mottled member at this locale is known to have lungfish burrows ... unless they're crustacean burrows. This one seems large for a crawdad (even a Triassic crawdad) but small for a lungfish.
  7. Compy

    Possible Coelophysis tooth

    Hello, I m thinking on buying this tooth. According to the seller it is a Coelophysis sp. from the Chinle Formation. Apache County, Arizona. scale is in mm. Can anyone of you confirm the ID for I am not that familiar with Triassic material? Thank you very much in advance!
  8. Hello all! Any insight on this unidentified fossil, from Eastern Arizona, Chinle Formation, would be deeply appreciated. I'm presuming it's a partial phytosaur jaw, but I really have no idea. Originally from a family who collects on their private ranch. Please see images, which includes extreme close-ups. [P.S., this is the 2nd of 5 specimens that I'm posting for ID today; I deeply appreciate any insight that you can provide]. With gratitude, Ryan
  9. RetiredLawyer

    More tracks

    Found more tracks! Been digging out and flipping these big chunks of rock since all the tracks are on the underside. I stand corrected on my loose amateur term dinosaurs - archosaurs is the correct term.
  10. RetiredLawyer

    New footprints from today

    Just found these today. Two different slabs about 4 feet long. Some closeups of one of them.
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