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  1. I had polished a number of these fossil bearing cherts. The were studied in a paper Paleozoic fossils of the Jersey Atlantic plain, by authors William and Ardis Kuehne. It was determined that these cherts were brought by rivers erroding fossiliferous limestones in the new jersey and new york ridge valley areas and ended up here on this beach with the famous Cape May diamonds (clear quartz) I had these tumble polished by my friend Leo Thomas. I am posting some finds. If any one has more detailed experience with identifying bryzoans and other things from the Ordovician to devonian period please
  2. allquieton

    Tube Structures--What are they?

    Found near the Whetstone Mountains, near Tucson, Arizona. I am very curious about the long, orange tube structures I found. Some folks told me they are just chert nodules. Others seem to think could be fossils. So, I took more photos to see if I can get more information on them. They were found right near some other fossils--fenestellid bryozoans, rhynchonellid brachiopods, gastropods. The area is littered with fossils. Several of these structures reveal a tube structure, which I think would be unusual in geology. A lot of these structures have a very s
  3. Stumbled upon interesting "imprints" and "casts" in one of our backyard landscaping rocks (Houston). The landscapers call it "Bull Rock"... I think it is actually "chert". Looks to be marine invertebrate fossils? Would that be common or rare in this type of rock? Wondering if it is worth searching more in the back yard?
  4. Hi! I found this very large and irregularly shaped flint nodule on the Thames foreshore, London. To me, it kind of looks like the branching arms of a sea sponge, but I have heard that flint nodules also sometimes filled the shape of animal burrows and other things. It has a number of holes/handles in it. What do you think it is?
  5. Thames Adventurer

    Strange flint fossil

    Hi! I found this strange piece of flint on the Thames foreshore. Is this a fossil sea sponge? Thank you
  6. Ren_Iain

    Fossil find in Yellow Jasper

    Found this in the ‘Golden Gravel’ in our garden. Source unknown as it was here when we moved in and rock ID’d (using an app) as Yellow Jasper. The closest thing I’ve been able to find for the fossil is Hamulina or Toxoceras (last image), but not been able to find any mention of this being found in Jasper. Any ideas?
  7. CornelDumitru

    Is this stromatolite?

    Hi! Is this a stromatolite? I picked up this rock on the premises of the Teleajen oil refinery in Prahova county, Romania. I have seen a chert wedge in a limestone boulder once upon a time, but this stone is different. It has layers of chert and carbonate, right? I grinded and polished the stone. Here is a close-up from the carbonatic area (fizzles with acid): Any idea how old are these rocks when found in S-E Europe? Thanks!
  8. truceburner

    Fantastic Fern Fossil In Flint

    An acquaintance found this on a ranch outside of Roscoe, TX. I presume it's some sort of fern. Any chance we could narrow it down further? It's a lovely specimen with a special remembrance for the collector. Appreciate any help you can offer.
  9. curatorcoulter

    Mudlarking the Meramec River in Missouri!

    Hi everybody, I'm a neophyte to the geological realm (especially regarding paleontology), but I thought I'd share some finds on the forum. In Layman's terms, I found some clams, possibly some coral, and (...wait I know this one) Crinoids! Any possible fossil ID would be great, happy to be here, and glad to join a community with similar interests! All items below were found within 100-200 yards of each-other on the Meramec river just outside of St. Louis, Missouri. 1) 2) 3) 4)
  10. Samurai

    Fenestella sp.

    From the album: Missouri Bryozoans

    One of my favorite finds due to how its almost complete and is in a very hardy rock I am assuming to be chert
  11. Gary Stradling

    Chert or fossils or both?

    These come from limestone quarries in central Iowa, near Springville, which appear as crushed gravel for roadbeds. My sister picks these up on her walks and wonders if these are the result of volcanism, or fossils, or what? My friend and fellow fieldtripper Kent Budge gives the following explanation, but suggested that we post here to get the insights of real experts. “These are chert nodules that are formed by microscopic plankton called radiolarians, which are little microorganisms that pull silica out of sea water to make their shells, less than 1/16”. They can pull a lot of silica
  12. I found this in a creek in middle Tennessee. Is this part of a bone or is it chert? Or maybe it's something else completely. i see a circle on the inside of the tubular shape. there is also a less worn area that makes me think it is fossilized bone. I'm posting pictures with and without a louper. We have ordovician fossils as well as some ice age mammals. One dinosaur was found here, the hadrosaur. Birds, crocodiles, trees, i don't know about whales.
  13. aek

    Local Railcut

    Went out to a railcut that slices through upper Racine formation. This locality is only 10 minutes from my house. I almost never visit it because of scarcity of fossils, however I was reading a paper that mentioned forams in chert and decided to take another look. Here you can see the beds dipping gently to the east. This is interreef strata. Closeby is/was a huge reef, now filled with garbage. Here is a chert nodule to be sliced up. Also, found a silicified coral and packed in my bag. Disturbed this guys slumber. Silicified Favosites
  14. Strange shaped Chert nodule? Or native artifact? Natural or not? Found in creek.
  15. Lone Hunter

    Chert flake? Spoll? Scraper?

    Had this in with my rocks for tumbling, now that I'm looking at it again I'm thinking it may be something. It came from Alluvial gravels in creek where I've found other artifacts. Trying to learn to recognize when something has been worked, think this has, and the edge is quite sharp.
  16. Found this guy today. Anyone know what it is. Found 25 miles northeast of Nashville. In chert with corral horns and crinoids.
  17. Hello, everyone, these fossils were collected from the basal Cambrian in South China, all of which are organic. But I do not know what are they? Does anyone can identify them. Please see the attachments! Many thanks.
  18. Nicole delacruz

    Please tell me it's chert

    I found this on one of our mts in middle Tennessee. I'm concerned it may be bone and not chert like I had found later near my home.
  19. I really almost dismissed it as a rock but second guessing. Could this be a shark tooth possibly? It was found along with crinoids and horn corals in a creek in Nashville area Tennessee
  20. What causes certain pieces of chert to have a plastic look and texture after an acid test
  21. Vnaz50

    Chert coloring

    On this piece of chert it appears to have either an iron or copper coloring at the top but a green undertone at the bottom. On the second picture I’m assuming that was caused by erosion. What would create the green undertone coloring?
  22. LA fossils

    In the field

    does anyone see anything that resembles any kind of dermis of any kind in these photos
  23. Chedda

    Fossil or Odd Rock?

    Like in the title, I am unsure if this is even a fossil.
  24. SCSeaGal15

    Petrified wood?

    Found this at the edge of a shallow stream bed that flies down from Smoky Mountain region in East Tennessee at Indian Boundary Lake near Tellico Plains Tennessee at edge if Cherokee National Forest. It measures 2" long, 1.75" at widest 1/2" deep at deepest. A bit more flat on one side. Cross section shows a thin outer layer. Outside look reminds me of wood but I don't know. Looks like photos too big so I will load another below.
  25. van Keulen, P. and Rhebergen, F., 2017. Typology and fossil assemblage of Sandbian (Ordovician) 'baksteenkalk': an erratic silicified limestone of Baltic origin from the northeastern Netherlands and adjacent areas of Germany. Estonian Journal of Earth Sciences, 66(4), pp.198-220. Link to open access PDF file Winterman, W., 1990. Baksteenkalk. Grondboor & Hamer, 44(1), pp.11-13. Rhebergen, F., 2001. Trilobieten in noordelijke zwerfstenen in Nederland. GEA, 34(3), pp.39-43. Rhebergen, F., 1993. Ordovicische zwerfstenen i
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