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Found 746 results

  1. Kornei, K. (2018), Tiny algae may have prompted a mass extinction, Eos, 99, https://doi.org/10.1029/2018EO102539. Published on 11 July 2018. https://eos.org/articles/tiny-algae-may-have-prompted-a-mass-extinction https://eos.org/wp-content/uploads/2018/08/eos0918.pdf?x69145 https://eos.org/current-issues The paper is; Shen, J., Pearson, A., Henkes, G.A., Zhang, Y.G., Chen, K., Li, D., Wankel, S.D., Finney, S.C. and Shen, Y., 2018. Improved efficiency of the biological pump as a trigger for the Late Ordovician glaciation. Nature Geoscience, 11(7), p.510. https://www.nature.com/articles/s41561-018-0141-5 Yours, Paul H.
  2. Trilobite ID

    I have been to Graf, Iowa three times in the last 10 years and am always amazed at this site with the shear number of cephalopods exposed in the rock face. This fourth trip was made to find some material for a forum member. In doing so, I took the time to look closely at the matrix present at Graf. There were gastropods, brachiopods, bivalves ,graptolites, and even trilobites hidden in the rock. I had never noticed this on my previous trips since the cephalopods are overwhelming. I would love to go back another time soon and NOT look at the cephalopods at all, to see what I could find. I am here today to get Identification of the trilo-bits that I found at Graf. My guess is Thelecalymene mammillata. @piranha @DevonianDigger, if you still are looking for trilobits, I can send a few of these. 2018-10-009.cxf
  3. Ordovician: Echinoderm scale?

    Finally, I have a fossil with some geological information associated. This piece is from the lower Ordovician Wah Wah Formation, specifically Section J in the Confusion Mountains in western Utah. I believe it might be an echinoderm scale. I would be thrilled if anyone could verify that and/or add any additional taxonomic information for me. Thank you so very much for your thoughts, and please let me know if you need additional photographs and I will do my best!
  4. Help With Platteville Mystery Sponge

    I came across this unusual fossil on a recent collecting trip to Southwestern Wisconsin. It was attached to a hash plate containing mainly brachiopod fragments. It appears to be some type of sponge that I have never encountered before. It is roughly the size of a tennis ball with an opening at the top. There is also a smaller round opening on one side that might have been from predation. Any thoughts on what this might be?
  5. Galena Gastropod ID

    This Ordovician gastropod is like no others that I have found. Any knowledgeable members able to educate me?? Maybe a strange maclurite?? Love the hollow crystalline interior.
  6. Just got back from a trip to Forbes, NSW a couple of days ago. Found some great stuff! But after that we checked out a site mentioned very vaguely in an old paper and were pretty successful! The site which is located near Parkes, NSW has Late Ordovician trilobites and other fauna. From what I can gather most of the species from the site are undescribed(?). Anyway, here are a few of my finds, maybe @piranha could help out with some ID's. Oh and I haven't finished prepping these specimens, but I'll post them when I have, although it may be a while since my airscribe has decided to break Crinoid Undescribed calymenid Unidentified trilobite cephalon Another no ID trilobite cephalon. Halfway through prep... continued...
  7. Asaphus kowalewskii, Lawrow 1856. Middle Ordovician, Leningrad region, Russia. Size of the specimen is 5х3.5 cm. The trilobite was found in the abandoned limestone quarry near St. Petersburg. Field season 2017. Preparation is finished about a week ago. saphus
  8. Locally, I find quite a few large cephalopods. Here is an example: Unfortunately this specimen was deteriorated. and I collected only it's exposed siphuncle. After gluing it back together, I noticed definite narrowings that I do not understand. Other siphuncles I have found have raised areas on them, not narrowings. Any ideas on this anatomical aspect??? Here is another cephalopod I found that day. Love the crystals inside.
  9. Was digging around in some boxes and found this specimen... it has a decent number of species on it! Although its nothing compared to another plate found at the site by some friends. We were going to split it but decided not to. Ended up having a couple hundred individual graptolites inside... but anyway! Sorry about the horrible pic as per usual. Early Ordovician (Bendigonian Stage) Bendigonian Formation, near Bendigo, VIC Australia.
  10. Hi everyone, I’m very much an amateur and late new starter. This is my first enquiry. I’ve booked a 1day session at Upper Gilwern quarry with an overnight stay. Daylight hours and check in / out times mean that I will only have a limited 1 day max regardless of the weather. I want to maximise productivity and finds as I’m travelling a long way to get there. Does anyone have any specific guidance or tips for this location? Research has only provided general access descriptions and the fact that the chance of finds is high. But exactly where do I go in this quarry. I have no real idea on how big it is. Any help or specific pointers / tips would be greatly appreciated. Regards, Bob
  11. Trilobite Identification Help

    Hey guys I need some help identifying these possible trilobites. Any information about which part of the trilobite the specimen is, species, etc would be appreciated. All of these specimens were found in Cincinnati, ohio in rocks from the Ordovician period. These 3 similar looking fossils are about 1 centimeter in length. This fossil is 3 centimeters in length. Showing front and back. This trilobite impression is 6 centimeters in length and 4.5 centimeters in width.
  12. Hash Plate Identification

    Howdy all, I cleaned up a small hash plate and found this curious formation.... I believe this is the cephalon portion of a trilobite. If it is, this is the largest T-bizzle I have found! Let me know your thoughts. I'm finding some really packed hash plates from my recent dig. Sorry again for the poor picture. I really need to get a camera. Anyone know how to sneak one of those by the wife? ;p
  13. Unknown Fossil

    Hey so I recently went on a school trip to Caesar Creek to look for fossils. Most of what we we were looking for were small trilobites and ancient coral, but I found this long spine like thing in the ground and have no idea what it is... it was about the width of a fist.
  14. Fun in Southern Ohio!

    Howdy All! Been a couple of months since I have posted anything. Work has kept me more than busy with travel. BUT, I wanted to share a quick day trip to my dig site yesterday in northern Cincinnati. I explored far left into the hillside I am excavating to see on the surface what Gastropods, Brachiopods and Bryzoa I could see and I was happily surprised that I found the mother-load! This area of my site was covered by a lot of growth and the runoff of water was less than in other areas I have been digging. I have attached a couple of pics and some real quick finds I cleaned up last night... sorry about the pic quality, I do not own a fancy camera. I love when I am lined up with conference calls and I can enjoy my hobby why listening to statistical analysis (actually mostly ignoring). I will try to save more pics in the comment sections. One specimen has me confused. I found a number of trilobite pieces throughout my day and collected around 25 hash plates with several in them. I have yet to clean them up. But pictured below (if it lets me) is what appears to be the bottom portion of a trilobite but I'm unsure.
  15. Three Ordovician Unknowns

    these are three specimens collected in Fillmore County , Minnesota this summer. This is Ordovician. Beyond that, these were out of fallen rock and I can not narrow it down any more.I keep looking at them, not really sure I understand what they are. Soooooooooooooo feel free to comment on them. 1. Looks crinoidal but is full of pores. So bryozoan masquerading as a crinoid cup? Or bryozoan covered crinoid cup? 2. All I can think of is 2 brachiopod shells in apposition, but the linear structure in the middle confuses me. The hinge??
  16. Help With Iowa Trilobite

    This past weekend, I had a chance to collect a well known roadcut outside of Clermont Iowa. The site is Ordovician in age and exposes the Clermont section of the Maquoketa Formation. one of the interesting pieces that I collected was this tiny trilobite. As you can see from the picture,There is not much to go on however the hypostome is preserved. I am hopeful the Trilobite will be complete and was wondering if anyone might know what species it is/could be. Any help is appreciated.
  17. I can't seem to find an ID for this find. I believe this may be a siphuncle. What do you guys think? The "V" shaped sutures are really throwing me off. Has anyone seen a straight shelled cephalopod with this "V" pattern? Kinda neat how you can see how this was buried, preserving one side as it weathered the other. Then along came a dozen crinoids or so a used it as a nice base.
  18. Unknown Ordovician Fossil

    This fossil is from the Platteville formation in southern Wisconsin, which is Ordovician in age. It does not seem to be a compress spiral, but rather composed of separate pieces or plates that alternate on either side. At the tip there are two sections that are positioned in the middle rather than on either side like the rest of the sections seem to be. I put it under the microscope but there is not much finer detail besides the individual grains, so it does not seem to be a Bryozoan or Coral. If anyone has any leads they would be much appreciated. The scale is in centimeters.
  19. During the summer i found time to empty a bit crates from the recent trilo hunts. Here come some of those recent prep. The samples come from 2 different sites which are only a few kilometers away one from the other. More or less orange ones from one place, black ones from the other. To start with, the emblematic Neseuretus tristani, most common trilos in our area. Those are second grade samples, but still, here they are :
  20. Uralichas sp cephalon

    From the album La Dominelais / La Noe Blanche - a few summer prep

    Uralichas sp cephalon a trilobite from the ordovician shale of La Dominelais (Brittany / France)
  21. Neseuretus tristani - 3

    From the album La Dominelais / La Noe Blanche - a few summer prep

    Neseuretus tristani, a trilobite from the Ordovician shale of La Dominelais ( South of Rennes / Britanny / France)
  22. Neseuretus tristani - 2

    From the album La Dominelais / La Noe Blanche - a few summer prep

    Neseuretus tristani, a trilobite from the Ordovician shale of La Dominelais ( South of Rennes / Britanny / France)
  23. Neseuretus tristani - 1

    From the album La Dominelais / La Noe Blanche - a few summer prep

    Neseuretus tristani, a trilobite from the Ordovician shale of la Noe Blanche ( South of Rennes / Britanny / France)
  24. Colpocoryphe rouaulti - 2

    From the album La Dominelais / La Noe Blanche - a few summer prep

    Colpocoryphe rouaulti a trilobite from the Ordovician shale of la Noe Blanche ( South of Rennes / Britanny / France)
  25. Indet trilobite

    From the album La Dominelais / La Noe Blanche - a few summer prep

    Indet trilobite from the Ordovician shale of La Dominelais ( South of Rennes / Britanny / France) (Prolly colpocoryphe or salterocoryphe sp)