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  1. 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
  2. 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
  3. 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.
  4. 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
  5. Strange shaped Chert nodule? Or native artifact? Natural or not? Found in creek.
  6. 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.
  7. Found this guy today. Anyone know what it is. Found 25 miles northeast of Nashville. In chert with corral horns and crinoids.
  8. 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.
  9. 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.
  10. 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
  11. What causes certain pieces of chert to have a plastic look and texture after an acid test
  12. 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?
  13. LA fossils

    In the field

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

    Fossil or Odd Rock?

    Like in the title, I am unsure if this is even a fossil.
  15. 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.
  16. 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
  17. FlirtsWithChert

    Crowley’s Ridge

    All of my pieces come from a creek on Crowley’s Ridge in northeast Arkansas near the Missouri border. Crowley’s Ridge is believed to be about 10,000 years old. Located as far north as New Madrid, Missouri and as far south as Wynne, Arkansas, it is believed by some to be a former bank of the Mississippi River. At some point, it may have even been an island. Some research has suggested that the ridge was affected by volcanic activity in the distant past. Today, Crowley’s Ridge is known for its gravel pits, uplifts, and bluffs which were likely caused by t
  18. Yess

    Are these bite marks?

    Hi, I came across this rock on the beach in Eastern Canada. I was wondering if anyone else finds it interesting. The marks on it resemble bite marks and I cannot let it go until someone helps me figure out what it is. Thanks! It's approximately 12 cm long.
  19. thinmint23

    Coral or Erosion

    Hi everyone. I found this piece of Missouri chert in a creek bed, but I am not sure if it is coral or just erosion. I have seen other pictures of coral that look similar to this, but I do not see any biological pattern or clues that this was once alive like you can see in something like a crinoid. Any help or tips would be appreciated
  20. Krissymich86

    Possible chert?

    My husband is an irrigator in the Midland, TX area. A client of his had this in their backyard and gave it to my husband. It was found on the clients ranch originally near Fort Stockton, TX. We thought it was a bone because, well, just look at it lol. We were able to take it to a gem and mineral show yesterday to have it looked at and the concenous was although very interesting, it was chert. Now all the research I've been doing on chert and I have yet to find anything like this. Reverse fossil maybe?
  21. I've had this ax for several years. It comes from Denmark, or at least that area. Made of ground stone, it contains a fossil that is approximately 5mm long. I have wondered since I got this what that fossil could be. Any help is appreciated. The ax: The fossil:
  22. Heylookyhere

    Vertebrate?

    I found 2 of these when I put in a septic system along with crynoid calyxs, nautilus, and ammonite peices. Wouldn’t expect to find anything like this here.
  23. Bob Clouser

    Strange fossils in chert found in NY

    Hi, I was driving along the NY State Thruway recently and stopped at several roadcuts in Devonian limestones. I picked up a big chunk of chert that had interesting fossils in it. I think they are crinoid column segments seen edge-on and end-on, but I'm not sure. They are all encased in chert and they are not CaCO3 (they don't fizz in HCl). Does anyone have any other ideas? Thanks for any help, Bob
  24. Hunterc123

    Ammonite?

    Looking through my typical pile of gravel I saw this, I thought maybe it was wishful thinking because I see spiral shapes all the time. I picked it up and noticed it had traces of shell like material tracing the spiral. Could it be an ammonite encased in chert like this, or just a worn down snail of some other sort?
  25. Picked this up on the beach today. I'm still a noob, but having lived in East Sussex for a few months I've become pretty adept at identifying our local fossils (if it isn't a sea urchin, it's a sponge), but this new thing has me stumped! Initially I thought it was some kind of coral, then on further inspection I thought maybe the top part of an ammonite (or mollusc) shell. Now I'm coming back round to thinking it might be an echinoid, but I can't explain the strut-like structures (surely not spines!?). The Details This was found on the beach near Rottingdean, East Suss
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