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Found 180 results

  1. Amazing Arizona Adventure II

    I went back to my very productive Devonian Martin Formation and Mississippian Escabrosa Formation near Superior, Arizona to retrieve my large single crinoid head fossil. Amazing Arizona Adventure original post link After some acid prep four crinoids and one blastoid were clustered together. Currents probably sorted them by size and shape. Several more hours of acid prep made the remaining four best ones stand out. I had to carefully break away pieces of shell that adhered and covered the crinoids and blastoid. Careful monitoring of their progress prevented any of them falling off the matrix. The resulting piece is probably the finest crinoid and blastoid assemblage ever found in Arizona. Finding one crinoid or blastoid cast in Arizona is very hard let alone four or five together. The two largest crinoids in the center and left are likely Physetocrinus lobatus. The upper right is an Orophocrinus saltensis blastoid. The lower right is an unknown crinoid. (Any idea what it is?) The field of view is about 7.5 cm wide. Keep looking for updates as I prep and post more fossils. I found several loose crinoid heads.
  2. Are these sponges

    I found these all on the same hillside in Arizona, redwall limestone, Mooney member, Mississippian. I'm pretty sure 1 is a Hexactanellid sponge. The others I'm less sure of and would like to hear more experienced opinions on them. The second picture is just the backside. Thanks for looking. Bob @Arizona Chris
  3. Pennsylvanian mystery of Arizona!

    Hey all, last week I was visiting my grandma in Arizona, and of course I had to stop at a local fossil spot! I’m just now cleaning up everything we collected (I’ll hopefully post a trip report tonight !!!) and I revealed this little thing from the mud. I believe the brachiopods on the flip side are Derbyia crassa. If you could help me with my little mystery, I’d really appreciate it! From the Pennsylvanian Naco Formation of Arizona.
  4. I saw an interesting modern “fossil”, a copper pseudomorph after a scorpion owned Flagg Mineral Foundation member, Bill Yedowitz. It will be featured in an upcoming special edition of Rock and Gem Magazine. Native copper and copper minerals sometimes replace and coat organic matter left in mines. I have seen pictures of copper replacing mining timbers and wood tool handles. I have heard that a crushed prehistoric Native America was found in an ancient mine in the SW US. Because the bones were replaced with malachite, it was named the Malachite Man and reburied. Another version of the story might be found here: https://en.m.wikipedia.org/wiki/Moab_Man Although too young to be a fossil yet, older fossils might be found that answer an earlier TFF post about whether or not native copper could be a fossil. @Herb @Auspex
  5. Tucson Show info?

    I’m looking for info on all the best fossil shows to visit for Tucson this year. Last year I made the mistake of going for the final weekend of the show and I missed most of the fossil shows. My job has moved me and I now visit the Tucson area almost weekly so I’m hoping to see as much as possible. Thanks in advance!
  6. Pinnules and echinoid spine?

    Hello again, I find these crinoid parts (I think) all the time and just want another opinion on what it is. I think number 1 is crinoid pinnules. Number two is the first and only one of these I've found so far here.(Mississippian redwall limestone, Mooney member). It's about 1/4 inch long and I'm guessing perhaps an echinoid spine? I appreciate any input you guys might offer. Thank you Bob
  7. Unknown Limestone Fossil

    Possibly a burrow? Found beneath the Chinle formation on US89 in northern Arizona. 4 inches long, 2.5 inches tall, with a slight curve and a flatter bottom side. The rock looks like limestone, but was found on a flat wash without similar rock in the nearby area.
  8. What makes square holes

    Hello, I pulled a large rock out of the ground a few weeks ago and I'm now cleaning up some of the small rocks that broke off as it came up. This one caught my eye cause it's got a trilobite but after cleaning I noticed all of these rectangular holes on the side. The lines on the rule are 16th inch. Any suggestions on what would've created rectangular holes like this? Thanks for looking!
  9. Amazing Arizona Adventure

    I found one of my most interesting and productive fossil sites ever east of Phoenix near Superior, Arizona in late November. The hill contained outcrops of the Devonian Martin Formation and the Mississippian Escabrosa Formation which is roughly the same age as the Redwall Limestone found further north. My first interesting find was several Pachyphyllum corals with very small corallites. The “craters” within the corallites averages just under 2 mm which suggested that these were the P. nevadense species which is not common in the Payson area further to the north. The coral is about mm across. I found a relatively rare Iowaphyllum nisbeti coral that was found by Gladys Nisbet, a botanist from the Phoenix area. The colonial coral is noted for its large corallites with prominent ridges in between. Coral colony is about 9 cm x 8 cm. Here is partially silicified Alveolites coral with very distinctive compressed fish-scale like corallite tops. This piece is about 65 mm across. Here is a nice massive Thamnopora coral 17 cm across. Along with the Alveolites were two types of stromatoporoid sponges. The first is an approximately 15 cm across Amphipora sp. with mound like mamelons. The second stromatoporoid has nice laminations with some vertical pillars. View is about 4 cm across. The most amazing find was several silicified calyxes of a blastoid and at least three species of crinoids found in the Mississippian Escabrosa Limestone. Interior and exterior molds of crinoids and blastoids are occasionally found further to the north in the Paleozoic rocks. Originals or casts are rare in Arizona especially when they are found in a few square meter area. This is the best spot that I have ever found for blastoids and crinoids. The largest and best blastoid was a 31 mm wide Orophocrinus saltensis that I have entered in the current Fossil of the Month contest. It was near maximum size for the species. I have seen no finer blastoid on the internet from Arizona. Cast your vote for the battle of the blastoids. I found at least three species of silicified crinoids. If you know what they are, please let me know. Species 1 is 11 mm across by 14 mm high. Species 2 is a cup that is 17 mm across by 18 mm high. Species 3 has interesting triangular patterns and is about 2 cm across by about 2 cm high. It is in a large rock that I need to break down so that I can carry it away. I planning on going back to the site to look for more goodies.
  10. Is this bryozoan or just rock

    Hello again, I found these 2 rocks this morning on my property. Redwall limestone, Mooney falls member, Arizona, Mississippian. I think the tiny branch looking thing might be bryozoan and I don't know if the bumpy rock is anything at all. What do you guys think, are these just weathered rocks?
  11. Arizona fossil?

    Hello from Arizona!! These are everywhere laying on the surface of the desert. Can anyone ID? Thank you!
  12. Found in a wash in Southern Arizona

  13. Unexpected bug

    So I've been collecting the rocks with obvious fossils on my property to make something, like a fossil garden or rock wall along the walkway. I plucked this out of the ground yesterday, rinsed it off and was about to toss it into the pile when I saw that trilobite. All the others I've found are just little white ones so I was very excited to see the condition of this one. If it wasn't for the obvious injury to the axial lobe I think I could've revived him.
  14. Crinoid like

    Hello and thanks for looking. I found these on my property in NW Arizona. It's Mississippian, Mooney falls member of the redwall limestone. I found the little pill like fossil a few days ago and then the column today. These are not like the tons of Crinoid fossils I've found nearby and I can't seem to find anything that matches online. I'm sure some of you will know immediately what it is. Please help if you have and ideas. Thanks
  15. Hello everyone! New here! I need help identifying this... I think it's a fossil but not sure. It was found on private land in Arizona. Any help would be appreciated! Thank you!
  16. Cylindrical fluted object

    Looks like a fossil branch perhaps. About three inches long. Ends appear to be porous. Pretty much looks like a small log. I
  17. Interesting find - unknown

    Found this today. Interesting striations on sides. Seems to have pores on ends.
  18. Shell?

    Found this interesting shell today. Seems to be sandstone. Thought it was a walnut shell at first. Can anyone ID?
  19. Naco Knockouts

    A few days ago I found a very productive fossil site in the Pennsylvanian Naco Formation in central Arizona. I went up to look at an interesting new track site in the Permian Coconino Sandstone NE of Payson that was found by a friend and is being studied by the prolific Spencer Lucas from New Mexico. Link The Naco Formation site that I just found, has the most diversity of sponges of any Naco site to date. It also has lots of large brachiopods. Photo 1 shows a 3.4881 × 10-18 light years (3.3 cm) long Composita subtilita brachiopod, the largest that I have seen. Photo 2: impression of exterior of a brachial brachiopod valve with spines now shown as holes (probably Exhinaria semipunctata). Shell about 5 cm wide. Photo 3: there were lots of Antiquatonia portlockiana brachiopods. This one is 5 cm across. Photo 4: impression of the exterior of a 3 cm brachiopod brachial valve. Note molds of spines below. Photo 5: this is the longest horn coral that I have ever seen from the Naco. It is 18 cm long. I am guessing that it is a Caninia sp. Photo 6: this is the largest “spiky ball sponge” that I ever have seen from the Naco. 1.7cm across. I only find them as singles in the rock or eroded out pieces that occur by the dozens in a small area. Literature hints that they might be sponges spicules. I am beginning to wonder if they are not an entire sponge or another creature altogether. I have yet to see a spicule that has crosspieces or ridges close to the center of the ball where the spikes attach. Photo 7: here is the pièce de résistance, a giant 10 cm Wewokella sponge that only a friend has found at another site and originally identified his as a coral. I said that his was a sponge. Wewokella have spicules with an average of 3 or 4 points unlike the Regispongia of similar appearance. Link Detail of above sponge. Note spicule shape. Photo 8: a 7 cm “dot sponge” of unknown affinity. They are somewhat common in the Naco. Photo 9: a small 1.5 cm disk shaped sponge with straight radiating spines. It might be a Belemnospongia. Photo 10: there are lots of flat chert masses that contain lots of straight sponges spines, probably from a single collapsed unidentified sponge.
  20. Sun was in abad position unfortunately but I’m curious if you think these are just random marks or something else? The top picture marks are about 8” total. The bottom two with the sets of four are about six inches square per set, on a huge boulder. As always, value your input!
  21. Fossil ID Resources

    Hi again everyone. Would you mind sharing with me your favorite fossil resources for ID, preparation, etc? Found a few this past weekend..... any easy ID help of the pics below would be awesome. i have a couple more that I might throw into a second topic. thanks in advance for your awesomeness. Sky
  22. New footprints from today

    Just found these today. Two different slabs about 4 feet long. Some closeups of one of them.
  23. Are these bone fossils?

    Found these in east central Arizona, close to where I have found fossil footprints. The brown rock surrounding the white material looks like fine sand adhering to it. The white material is smooth.
  24. Dinosaur footprints

    Found these in East Central Arizona. A deep wash has cut through a rock ledge containing lots of the footprints. Still working on trying to get some of the bigger rock slabs hauled out.
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