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  1. SilurianSalamander

    What kind of sponge is this?

    Silicified sponge(?) fossil found in Wisconsin Paleozoic gravel. Likely Ordovician or Silurian, possibly Cambrian or Devonian. Thanks!
  2. I found this along the Fox River in Elgin, IL. At first I thought it was a stromatoporoid fossil (I find them everywhere in this area), but upon closer inspection I couldn't see anything that looked like pillars or laminae. Someone suggested chaetetid sponge, or a stromatoporoid that was distorted by silicification. I can't find any photos that look like my spec. except dino bone and we don't have those in northern Illinois. Is it a natural formation, crazy looking oolites? I'm totally stumped! More pics
  3. hi everyone this is matt again today in the creek I found this very big coral fossil here is few photos
  4. my father found this at work, it was found in southern Ontario Canada. was curious if anyone knows what it might be, im thinking coral or possibly a sponge. thanks in advance.
  5. Shale_stack

    1/2 Douglas Pass Colorado mystery

    This was found in Douglas Pass Colorado years ago. I’m not sure if it’s coral or a sponge or nothing. Thoughts ?
  6. Hi, I have been recently to a Cretaceous quarry in Kazimierz and I found these. I believe this one is some sort of a sponge - can anyone confirm or correct this assumption? This one too, I guess. I also found two specimens like this - they look like some kind of bivalve. Can anyone help ID those? I will appreciate any clues as whay these might be. Kasia
  7. connorp

    Iowa Devonian Trip

    A couple months ago I took a trip to collect in the Middle Devonian of Iowa. It was a pretty good trip. I found some nice stuff and chatted with some very nice folks. Here are a couple of my finds. A partial ptyctodont tooth plate A neat sponge. I believe the genus is Astraeospongia but please correct me if I'm wrong. I was told these are rare from this area. A partial nautiloid And a partial Eldredgeops norwoodensis
  8. SilurianSalamander

    Port Huron, Michigan trip

    I drive 8 hours with a friend to a location he remembers from his childhood as yielding a lot. Oh boy it did. 100% worth the drive. Lake Huron, among the agates, pyrite, yooperlite, has some extraordinary Devonian fossils. All fossils were collected from the beach of his family’s property except for the fenestelid bryozoan, which was found at a gas station on the way there. please enjoy this collection of gastropods, petoskey stones, various tabulate corals, crinoids, stromatoporoids, bivalves, Brachiopods, tenteculites, horn corals, an unidentified agatized fossil in jasper matrix
  9. Mahnmut

    Fossil sponge from Mallorca?

    Hello dear fellow forum members, this is a fossil that I got as a gift when I was eight years old, as a fossil sponge. In the years after, I began to doubt if sponges fossilize and called it a coral, but maybe it really is a sponge after all? I think it is from the region around Porto Christo on the east coast, but cannot be sure about that. The east coast is mainly Miocene on the surface as far as maps tell me. There are jurassic and cretaceous fossils on the island also. Any ideas? Thanks, J
  10. Deb in Michigan

    Middle Devonian Stromatoporoids

    These fossil stromatoporoids came from the Traverse formation, Potter formation, Bell Shale, and antrim/dundee formation locations near the north eastern tip of the Mitt in Michigan USA.
  11. Nautiloid

    Small colony of Diagoniella

    From the album: Ordovician non-trilobite fossils

    This colony of Diagoniella sp. includes a few small specimens and one large specimen. Part of a huge colony that was collected from the Beecher’s Beds (Upper Ordovician, Frankfort Shale) in the fall of 2021.

    © Owen Yonkin 2022

  12. Nautiloid

    Two Utica Shale sponges

    From the album: Ordovician non-trilobite fossils

    These are pretty nice pyritized specimens, despite a lack of spicule preservation. They remind me a little bit of the Diagoniella from the Beechers Beds.

    © Owen Yonkin 2022

  13. Nautiloid

    Utica Shale sponge

    From the album: Ordovician non-trilobite fossils

    This is probably one of my favorite sponges from the Utica shale. It has awesome spicule preservation, is almost 2 inches wide, and stands out from the rock much better than most of my other non-pyritized sponges do. Someone once told me this was a rare Utica Shale phyllocarid, but phyllocarids don’t have spicules lol.

    © Owen Yonkin 2022

  14. Nautiloid

    Oddly shaped Utica Shale sponge

    From the album: Ordovician non-trilobite fossils

    At first glance, this specimen does not look at all like a sponge, but the wonderful spicule preservation would say otherwise. Not sure why this one is shaped so strangely.

    © Owen Yonkin 2022

  15. Nautiloid

    Utica Shale sponge

    From the album: Ordovician non-trilobite fossils

    This specimen is not all that visually appealing, but it does have great spicule preservation. The non-pyritized ones tend to be larger and have better spicule preservation.

    © Owen Yonkin 2022

  16. Nautiloid

    Colony of Utica Shale sponges

    From the album: Ordovician non-trilobite fossils

    These aren’t the best preserved sponges I have from the Utica Shale, nor the largest, but it is the one of the largest colonies I’ve found. There are 8 specimens on one side and 4 on the back.

    © Owen Yonkin 2022

  17. Nautiloid

    Pyritized Utica Shale sponge

    From the album: Ordovician non-trilobite fossils

    This is one of my best preserved sponges from the Utica Shale. It has much nicer spicule preservation than any of my other pyritized specimens.

    © Owen Yonkin 2022

  18. Hello. I found this strange fossil a couple of weeks ago and I cant figure out what it might be, my guess is a part of some sort of coral or sponge. It was found in the eastern part of the Siljan ring formation in Sweden, the layer is possibly silurian or ordovician. Any clue as to what it might be?
  19. SilurianSalamander

    Beekitized stromatoporoid sponge?

    Found at work among crinoid, brachiopods, silicified corals as well as a possible cephalopod and some silicified stromatoporoids. Silurian SW Wisconsin. Looks kind of like a cartoon bone in shape
  20. Origin of fossils is a lower Cretaceous (possibly Cenomanian, though I cannot confirm with this much precision) marine site in southeastern Serbia. Some of these I'm completely or fairly sure about the overall phylum, but would appreciate a more precise (genus, or at least family level) taxonomic designation. I include both a broad shot to show the thing's shape and size, but also some shots through a magnifying glass - these can get shaky. 1. Likely coral Topside: Closeup (Topside): Closeup (Underside): 2. Coral or sponge Topside: Closeup (Topside):
  21. Lone Hunter

    Spongey porous thing

    The receding flood water left lots of interesting things in my go to creek, it is in cretaceous Eagle Ford but I find a little bit of everything in it from recent to Permian to Paleo and imported rocks. This one is unlike anything I've found here so not sure what to make of it, at first I thought man made because of flat side but obviously not, kinda looks like sponge but just don't know.
  22. DPS Ammonite


    Red chert radial sponge from the Pennsylvanian Naco Formation found north of Payson, Arizona. NB. Pennsylvan is a subperiod, epoch is Late and age is Moscovian. (Desmoinian under old system.) Dilliard, Kelly & Rigby, J.K.. (2001). The new demosponges, Chaunactis olsoni and Haplistion nacoense, and associated sponges from the Pennsylvanian Naco Formation, Central Arizona. Brigham Young University Geology Studies. 46. 1-11. geo_stud_vol_46_dilliard_rigby.pdf link
  23. All collected in gravel and beach rocks from SW Wisconsin. Thanks so much for the help! I love this community:)
  24. A partial decalcified specimen from the Upper Ordovician. Scale bar: 5mm The image on the left shows 2 views of one mould, the image on the right shows 2 views of the other mould. Into the 2 moulds (expecially in the left one) you can see that the specimen has, almost sunk on its surface, a piece of ramose bryozoan (decalcified) and an echinoderm columnal (decalcified). We don't know if it could be some sort of sponge or calcareous algae, or other...
  25. Muffinsaurus

    Is this coral or sponge?

    My neice just pulled this out of the creek at my mom's near Ashland Kentucky. I know the area to be Carboniferous. I think it's a coral, but I'm still too much of an amateur to know for sure. Any help would be appreciated by myself and my neice.
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