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  1. Samurai

    Schistoceras missouriense? Ammonite

    From the album: Missouri Ammonoids, Nautiloids and Gastropods

    Found this almost 2 years ago, but to my surprise, I never uploaded it! This is an interesting Goniatid as it seems to have Cerattic suture patterns. This is dated to the Pennsylvanian and most likely is from the Iola ls (Raytown member?) and is a beautiful specimen even though it is incomplete.
  2. Alvrr.0

    First prep

    Well, today my Zoic tips arrive so i decide to continue the preparation of this Ammonite. Its not finished yet but im really happy with the resultas. the rock pop quickly and easily. The inner whorls are preserved, that's the best thing for me. Its my very first real preparation project, so im very excited of the next one. Any tips to keep going with this specimen, general tips or commentary will be well recived
  3. I dont know if this Ammonite is Prolyelliceras Ulrichi or Peruvianum
  4. In my opinion, the black colour and the good state of the inner whorls give a more elegant touch to this fossil. I still dont know what type of rock are but its amazing
  5. Bringing Fossils to Life

    Mahantango Ammonoids- the complete guide

    Here is the complete guide to the Mahantango ammonoids! Koenenites is only included because of two specimens (found by my friend and I) from Swatara Gap, which includes some Mahantango strata according to HynerpetonHunter. Tornoceras is the most common, Koenenites the rarest. Enjoy!
  6. Is the fossil site at Union Wash worth going to? I've read that the site's been depleted of fossils. Is that true?
  7. FossilAddict59

    Association plate

    This is a Carnian aged natural association of Traumatocrinus crinoids, and either Trachyceras, or Neoprotrachyceras Ammonoids from Guanling Guizhou province China.
  8. Paula (Seneca20) found this complete and near perfect Ammonoid (Manticoceras) during our hike/fossil hunt on Sunday 8/21/2022. She goes "oh hey, there's this thing" It was the find of the day, of course I'm not sure if I should clean it up or leave as is. I think it looks kinda cool half buried in a nodule. The shell of the cephalopod is in great condition. Something that rarely happens in this formation. Good job Paula!
  9. Bringing Fossils to Life

    A reconstruction of the Mahantango Formation

    I just finished a reconstruction of the Mahantango ecosystem, based off of fossils I have found at corresponding sites. This certainly does not cover all species in this formation, but many of the most prominent (Sorry no Dipleura, haven't done that one yet). I recently learned about Striacoceras and re-identified many of my orthocerids as this obscure genus. Striacoceras is the brown orthocone in the background. I included two crinoid genera, (left to right) Ancyrocrinus and Botryocrinus. an Eldredgeops searches for prey. There are several Mucrospirifer brachiopods, some Orthonota bivalves, a couple ammonoids (Tornoceras and Agoniatites), and some Pleurodictyum coral. In the distance, a shoal of Bactrites drifts. This is one of my first entire ecosystems.
  10. I just made new ID posters for Hamilton Group Cephaloods - one for Nautiloids and Bactritoids, and one for ammonoids. The reconstructions are either new or updated for accuracy. Color patterns on the first picture are based on close relatives. If anyone has any suggestions, please let me know - I want these to be as useful as possible.
  11. After a lot of research, I made this family tree for all of Cephalopoda. I have posted major resources below. Dates and lots of other stuff: https://paleobiodb.org/#/ Mass Extinction events https://samnoblemuseum.ou.edu/understanding-extinction/mass-extinctions/end-ordovician-extinction/ https://samnoblemuseum.ou.edu/understanding-extinction/mass-extinctions/late-devonian-extinctions/ Ammonoid classification: https://www.researchgate.net/publication/292489944_Fossil_Focus_Ammonoids Extinction of the Goniatites: https://www.nationalgeographic.com/history/article/121018-triassic-extinctions-hot-global-warming-science-environment Evolution of non-octobranchian coleoids: https://www.researchgate.net/publication/257132699_Longibelus_gen_nov_A_new_Cretaceous_coleoid_genus_linking_Belemnoidea_and_early_Decabrachia Evolution of octobranchians: https://static-content.springer.com/esm/art%3A10.1038%2Fs41467-022-28333-5/MediaObjects/41467_2022_28333_MOESM1_ESM.pdf https://www.nature.com/articles/s41467-022-28333-5 Extinction of the Ellesmocerids: https://onlinelibrary.wiley.com/doi/full/10.1111/j.1475-4983.2007.00644.x Early Spirulids; https://www.researchgate.net/publication/325588476_An_Early_Triassic_gladius_associated_with_soft_tissue_remains_from_Idaho_USA-a_squid-like_coleoid_cephalopod_at_the_onset_of_Mesozoic_Era And here is the family tree:
  12. Fischcrazy

    Devonian (Givetian) Ammonoid ID Help

    I collected these last weekend from the Millboro Shale (Devonian: Givetian) in Highland County, Virginia, USA. I cant seem to identify these and not familiar with Ammonoid taxobases, not sure where to start. I did go through House, M.R., 1962, Observations on the Ammonoid Succession of the North American Devonian. House does cover the Millboro Shale but only lists occurrences of Sobolewia virginiana, Tornoceras uniangulare, Maenioceras sp. I dont have access to the Treatise part K so any help IDing these would be amazing!
  13. Bringing Fossils to Life

    Life reconstruction of the Ammonoid Koenenites

    Here's the reconstruction of Koenenites I promised. Koenenites was a Devonian ammonoid with a very compressed shell and sharp keel. It was designed for fast swimming and thanks to the shape of its suture, it could accelerate very quickly compared to the ammonoids around it without its cameral fluid sloshing around and shifting its center of gravity. Because of its evolute shell, it likely had a large hyponome, which goes with the shape of its shell. After looking at some pictures of Koenenites fossils from Michigan that may have preserved the Supercephalic Attachment Area, I arrived at the proto-hood size in the picture. The eye size was inspired by the "ammonite preserved out of its shell", which preserved what is likely the ammonite's eye-cups, though eye size varies greatly. I based the hooks off of those of the much later ammonites, so Koenenites may have had ones different form those shown here. These preserved hooks were in positions similar to those on today's squid's tentacles, so ammonoids likely had elongated tentacles. The 8 thin, retractable arms were inspired by fossils of Baculites ammonites, though Koenenites was an active pursuit predator and Baculites a planktivore. Koenenites could afford smaller arms, though, because it likely had two muscular tentacles. I reconstructed this ammonoid's shell with a monochromatic color pattern, because nektobenthic ammonites have been found with this. Shell orientation based on preserved Supercephalic Attachment Areas. The second picture shows how Koenenites' (3A, 3B) suture shape helped it accelerate faster without its cameral fluid sloshing than other ammonoids like Agoniatites (1A, 1B) and Tornoceras (2A, 2B). bottom shows what would happen when the ammonoids started cruising at a slow to moderate pace, top shows what would happen when they tried to accelerate quickly. The lobe of the next suture would break the wave of cameral fluid so that its entire weight would not all hit the venter, but only a little bit. This shows that while Koenenites and Tornoceras were comfortable accelerating quickly, Agoniatites was more stable at cruising at an even speed. Any suggestions would be helpful! If there are any papers about ammonoid (or more specifically ammonite) soft tissue, that would be helpful too.
  14. Howdy all, I did a bit of fossil hunting in Fayetteville AK over Thanksgiving, hitting the Mississippian age black shale the area is famous for, looking for goniatites and any other ammonoids or nautaloids I could find. These concretions were dug out of the lower unit shale and many of them were large, extending over 4ft in length, flat, with an oblong appearance. This was on the surface of a concretion and unfortunately was exposed to weathering and moisture. Not sure what that is. This little guy, it’s just provided for grins and not requesting an ID. It’s way too small This is the main fossil I’m concerned with ID’ing. When I broke the concretion, it split revealing a horizontal cross section of an ammonoid. I have both halves and it appears to be potentially well preserved. I’m attempting to prep it but it’s been a real struggle due the siderite that makes up most of the mineralization in these. It shines like metal when it’s cut or ground with a diamond bit making it very difficult to make out features and details. It all just looks like a shiny metallic mess. To complicate things further, many of the fossils are pyritized. I’m sticking to mineral oil only when slabbing and making large cuts. Oil causes the dust to clump and build up further obscuring things. Im also having to wear a respirator to avoid breathing this dust and it makes a nasty mess. It’s a total pain but it’s worth the hassle to get one well preserved ammonoid, even if it’s small. I’m curious if anyone has ever worked with this shale and if any tips can be provided. I’m only attempting this kind of prep once as an experiment. If it works, I’ll do the same with the other half and glue the halves back together. Im leaving enough matrix on the bottom to provide a base to stand it upright and only removing matrix from the dorsal side. I have no clue if this will work or even how much of this thing is preserved. When slabbing excess matrix off I found a second Ammonoid below it that appears completely pyritized, though less well preserved. It’s the piece on the left and the rest of it is under the fossil on the right. Note that it’s cut like a vertical cross section and not proportionally. Any assistance or info is greatly appreciated. I realize that a definitive ID may be impossible without exposing the dorsal side and it’s sutures.
  15. From the album: Lando’s Fossil Collection

    Ammonoid in mudstone collected from Devonian Foreknobs formation sediments of the Jefferson National Forest near New Castle, VA.

    © Lando_Cal_4tw

  16. connorp

    Tiny Pennsylvanian Ammonoids

    Over the past year I've I found two tiny ammonoids from a site in the Carbondale Formation (Middle Pennsylvanian) of Illinois. Both measure approximately 5mm in diameter. The first specimen below showed no details of the exterior of the shell, which I believe are necessary in identifying these. This week I found a second specimen (maybe a different species) which does show the suture pattern. I'm hoping that this specimen is identifiable. Part Counterpart Does anyone recognize the species? Thanks!
  17. During an afternoon break I found a dozen or so promising concretions at an outcrop of Fayetteville shale. I'm thinking of going the freeze/thaw route as my history of hammering concretions is a but hit or miss. Curious as to the opinion of the forum on the best technique. Also, should I consider setting a couple aside and try to get whole fossils by remove the matrix? Thanks in advance.
  18. cngodles

    Pennsylvanian Ammonoid

    I've had this specimen sitting in my "I'll get to it later" pile since last year. I've learned a lot about Cephalopods the past year, one of them being the differences between Nautiloids and Ammonoids. Upon re-inspection of this yesterday, I noticed the shell lines, but more importantly the suture lines caught my eye. These do exist here, but I would call them pretty rare to find. Not being an expert, I would consider Wellerites or Schistoceras, but these are based on quick comparisons using a Pennsylvanian Cephalopods of Ohio book I have. I started to clean up the rock using an air scribe, but I've only got about 30 minutes into it so far. I need to take much better photos, but the shell exterior is messy like this. You really need to rotate it under light and/or a microscope to see the sutures great. There is so scale in the photo, but it's 20mm from front to back of the inner exposed whorl. The top of the photo is still more shell continuing on another 9mm and I started to expose more suture pattern there. The top of the exposed whorl has some shell material pattern shown in a black color.
  19. Bonehunter

    Ammonoid Neoglyphioceras?

    Good evening everyone! Hope everyone is safe and healthy! Found this little (15mm) "ammonoid", that, to the best I can find is an example of a ridged ammonite Neoglyphioceras sp? (Unklesbay Common fossils of Missouri 1973). It was found in Pennsylvanian Winterset limestone in Kansas City. Is this a fair observation/guess? Thanks for any input! Bone
  20. Fossildude19

    Before and After prep.

    From the album: Fossildude's Purchased/Gift Fossils

    Lituites lii (Middle Ordovician ammonoid) before and after prep with air abrasives. The dolomite may have been a bit harsh, but some more matrix could be removed. I will have to take some time with baking soda to try to remove the excess. Not too bad, though.

    © © 2014 Tim Jones

  21. JulianoLPD

    Ammonite ID? Perisphinctes?

    Hi there guys, I got this ammonite as part of a set from Madagascar. I would like to know if this is a Perisphinctes. What caught my attention is that it seems to be more "larger" than the regular Perisphinctes I'm used to, at least. Let me know your thoughts.
  22. AstroRaptor56

    What is this ammonoid

    Here’s something I found in Michigan, it’s an ammonoid of some type but I thought it was too wide to be a goniatite, I could be wrong though.
  23. Hi there folks, Just need to know if I'm seeing this right. This is a piece from Madagascar I recently received. At first I didn't give much attention to it, but today i noticed the three small markings on the center of the piece. My question is: Would that be the reminiscent of the siphunculus of a Nautiloid specimen? Piece is from Madagascar. Thanks in advance, Juliano
  24. Enafter

    Fossil IDs (if possible)

    I like collecting fossils, but I usually am not sure what my finds are. Please, could you help me identify these fossils? I noted down some possibilities down below. 1 - could be a late Albian ammonite from central Serbia, but I am not entirely sure. Acquired in Serbia. 2 - Found at Southerndown, Wales. Could it be a tree root or something in the region of that? It has a cross-hatched pattern if you look closely. 3 & 4 - A shell I found at Penarth, Wales but I am not entirely sure what it is called. 5 - A bone I found in the mud at Tites Point, Severn, Gloucestershire. maybe a birds? 6 - Some shells I found in mudstone at Charmouth, England. Was found in the same stone as 7. 7 - wood I found at Charmouth? It was very crumbly and delicate. 8 - A Trilobite fragment possibly, Llanfawr quarries, Wales. 9 - A bivalve I found in Southerndown. Not sure what it is though.
  25. andreas

    Discotropites sp.

    From the album: alpine triassic Ammonoids

    Discotropites sp. from Triassic/upper Carnian "Hallstatt" limestone. Zone of Tropites subbullatus/Tuvalian II.
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