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  1. RetiredLawyer

    More tridactyl type tracks

    Been finding a few of these types of tracks recently. Will be curious to see if they actually are tridactyl dinosaurs.
  2. DPS Ammonite

    Crania Brachiopod

    Crania Crania modesta is a rare calcium carbonate Pennsylvanian inarticulate brachiopod. The shell is very thin and the ornamentation of the shell below shows through. You can see the interior of a near circular 4.6 by 4.8 mm pedicle valve that attached itself to aLinoproductus prattenianus (photo #1). A bryozoan also covers the front and back of the Linoproductus (photos #2 & #4). Photo #2 is a different photo of the same Crania as in photo #1. The Crania has a thickened rim and a sub central knob. Rowell (1965, p. 289) lists Crania as the only Pennsylvanian genus with a calci
  3. Mr.Waffles

    A Very Tiny Mystery

    Hello wonderful fossil-people! If you and you're gang enjoy solving a groovy mystery, I have a post for you! This rock was found in an area of Northern Arizona that is very well know for producing lots and lots of bryozoan, brachiopod, and crinoid fossils, as well as crystals and geodes. The bit of rock in question was found in the side of what appears to be a broken geode. There is a triangular fragment of stone that does not match the material surrounding it. There is also a white discoloration encompassing the triangle that I've highlighted in green on one of the photos below. The colo
  4. Steak_Knife86

    Dinosaur Horn?

    Possible Triceratops Horn and many other dinosaur parts.
  5. DPS Ammonite

    Productid Brachiopod

    While removing an unknown sponge by acid dissolution from the Permian Fort Apache Member of the Schnebly Hill Formation from northern Gila County in Arizona I found several silicified brachiopods with spines. Several Bellaclathrus spinosus brachiopods were present ranging from 0.75 to 1.5 inch across and had spines as long as 1 inch. The pedicle valve of the brachiopod in the first and second photos is about 1 inch wide not including spines. This is the finest specimen with spines that I have found. The third photo shows the brachiopod attached to several oth
  6. DPS Ammonite

    Miocene Lacustrine Stromatolite

    This silicified lacustrine Miocene stromatolite is a trace fossil made by a gram-negative photosynthetic blue-green bacteria. The originally limestone stromatolite was formed as a bacterial mat trapped sediment and precipitated limestone as it grew from the lake floor towards the sun. It shows classic convex layering towards the top. The stromatolites occur in tuffaceous and lime rich lake sediments that might be part of the Chalk Canyon Formation that is bounded on the bottom by basaltic lava and volcanic rich conglomerate and sandstone on the top. Locally numerous silicified cast
  7. Several days ago I ventured to a Devonian desert locality near Superior, Arizona. I found the largest fossilized coral colony that I have ever found: 2 ft across. A giant Iowaphyllum nisbeti coral was covered over it’s entire length with several inches of a stromatoporoid sponge. I should have taken a photo, but it was not very photogenic; it looked like a white ledge in cross section. First photo is a piece of light colored Iowaphyllum nisbeti coral covered with a medium gray calcitic stromatoporoid coral that is about 8 inches across. The top of the coral is pointed up.
  8. Hey guys! I’m going to be in Arizona for a few months and need to get my fossil hunting itch scratched! I’ll be viewing the petrified forest (and not taking anything of course), but I wanted to know where I could go to find some fossils. I will be getting a permit. As someone who hunts heavily in Florida I can’t wait to see the difference in Fauna and age in Arizona! let me know what you all recommend.
  9. Doug Von Gausig

    Fossilized raindrops?

    This dolomite stone was discovered near Chasm Creek, central Arizona. It appears to have the fossilized impressions of raindrops splashing into a fine muddy surface. The stone seems to be dolomitic, as HCl causes a low fizz, unlike typical limestone's more energetic fizzing. Most of the "splashes" have the central "rebound" splash seen in my high-speed imagery of water droplets. That central rebound appears to have been broken off over time. Does my assumption that this is a somehow frozen-in-time rain shower make sense?
  10. scrabblemlhook

    Need help identifying footprint

    Three of my family members found this footprint in Lake Powell, Arizona last October 2020. They differ in what they say the size is from 4 to 12 inches, but my husband is probably the most reliable measurer and saying 12 inches. They looked for more quickly but did not see any. The photo of scenery has a person in a white shirt in the upper central middle in the shadows it was right there or right below there where they found it. A university professor has said it is prehistoric. I did minor searching for clues and the only thing I have so far is it may be a therapod (dilophosaurus?) from the
  11. Troodon

    Tucson Fossil Show News

    It appears that the Tucson fossil show will happen, but greatly reduced, with a scheduled start on April 8th. The Governor in Arizona also just dropped all Covid 9 restrictions but I'm not sure Tucson's mayor supports or will follow that call. From what I can see its not the best year to come to the show with lots of venues canceled and many dealers will be a no show. What to expect: Big changes were already expected this year with the Arizona Mineral and Fossil Show moving from the Tucson City Center Hotel (TCC) to the El Conquistador Golf and Tennis Resort 10 miles a
  12. Steak_Knife86

    Dinosaur skin fossil?

    Hi, this was found in a dry wash in Phoenix, AZ. It was pretty dirty and dusty before I cleaned it off. It has an odd shape, it’s angled and curved. Don’t have any other info really. It feels how I would imagine a dinosaur skin would be though... or maybe dragon.
  13. RetiredLawyer

    Interesting new track

    Second picture is what appears to be a tridactyl track. First picture might be also. According to the paleontologist there is discussion of the possibility of dinosaurs being around in this time period.
  14. DPS Ammonite

    Ensiferites Sponge

    This is a Late Devonian sponge collected from the Percha Formation found at the type locality on Brandenburg Mountain in Pinal County, Arizona. This sponge, has the largest complete head reported. Although mostly covered in calcareous sediments and maybe caliche it has the best preserved spicules of the species that I have seen; better than the photos in the Rigby reference below. First photo is a close up of the star shaped spicules that average 1 mm across. Second photo is of the top of sponge that is 70-75 mm across. First published in: Rigby, J Keith; Dietma
  15. A friend cut a polished a silicified lacustrine Miocene stromatolite from central Arizona that I found. Thanks Stan C. It is about 8 inches in maximum length. Two faces were cut that show the upward convex growth. I am currently looking for a researcher to help write a paper about these and the other plant fossils that occur in the area. A piece that was cut from the same colony as this piece is being donated to the Pinal Geology Museum in Coolidge, AZ. https://pinal geology museum.org Another Arizona museum wants one. I am seeing if other local ins
  16. cavetrain

    Ammonite: real or replica?

    Hello, fossil friends! I'm a first-time poster to the forum. I've had this little fellow for several years now. I found it hanging out among the gravel decorating an apartment complex in the southwestern United States; Tucson, Arizona, to be specific. I cannot explain why it was there, unless it was somehow ignored as a rock, or discarded by someone who no longer wanted it, but all the same, I was aware of the general shape of an ammonite, and brought it home with me because, well, its spiral was pretty! There are several dry rivers about the area, but I know next to
  17. Could use some locals knowledge. I'm in Phoenix and looking at making a run to Quartzsite to look for some trilobites to take home. I was there years ago but can't remember which area the fossil vendors are in? I've been mostly to the area north of the highway that is almost all "odd ball" stuff. Thanks Steve
  18. 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
  19. RetiredLawyer

    Deep mud in new site

    Been digging my new area. Finding large area with what seems to be deep mud. Lots of partial, poorly impressed tracks so far. From the exploratory holes I’ve dug the area seems to cover at least an acre so hoping to find some good things.
  20. RetiredLawyer

    Found a third site

    Out walking and flipping rocks as usual and found a new site. I don’t recognize most of the tracks.
  21. Doug Von Gausig

    Mississippian Isopod?

    I run across these guys frequently in the Mississippian Redwall Limestones around Arizona's Verde Valley. They are generally accompanied by lots of Crinoids and solitary Rugose Corals. They're always this oval shape with segmented structure. They look like an isopod, to me, but could be some other crustacean. Any help out there for the identification of these "bugs?"
  22. Doug Von Gausig

    Mississippian fossil, Arizona

    This little thingy was in Mississippian Redwall limestone in central Arizona. It was in a section of the Redwall with very few other fossils. It's about 10mm long and 7mm wide. What do you think?
  23. RetiredLawyer

    A bit unusual

    Found this today. Rock is about 12-14” long. Paleontologist thinks it looks organic but doesn’t know what it is offhand. I’m thinking fossil unicorn, but I could be mistaken. Anyone?
  24. I found another Ensiferites brandenburgi sponge that is now currently the largest ever found at 7 cm x 7.5 cm across. Part of the top displays lots of 1 mm spicules. Unfortunately the top of the calcareous sponge is mostly covered with caliche and possibly the limestone matrix. Is there any hope to prep this to expose all the spicules on the top? How? This could become a near museum piece thus I don’t want to practice my prepping skills in it. Help @Ptychodus04.
  25. RetiredLawyer

    Some new finds

    Started hitting another good load of rocks. Found the one huge chirotherium. Some interesting tracks I can’t identify too.
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