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  1. Alexthefossilfinder

    Rugose coral or nautiloid shell imprint?

    Here's a find from last summer. I originally classified this as a nautiloid, though I think it could be a horn coral too. Unfortunately I'm not very familiar with the inner workings of either and I can't see much that could point one way or another. I do think it's a nautiloid judging by how straight it is, but I would appreciate feedback from anyone with more experience.
  2. Mochaccino

    Two Nautiloid Steinkerns?

    Hello, Could I get some help identifying these two nautiloid steinkerns? Unfortunately no precise age/locality info on them but I think they might be from the Pennsylvanian or Permian of Kansas or Texas. They are both around 8-9cm wide. 1. 2. Referring to this: http://inyo2.coffeecup.com/kansasfossils/kansasfossils.html I think #1. might be Metacoceras and #2. might be Liroceras. @Missourian I believe you are referenced in that post and you seem to be experienced in this fauna? Thanks
  3. Hello, found what I think are nautiloids and brachiopods. I found the rock in a stream and I can't say what limestone (maybe brush creek or pine creek), but the area is Glenshaw Formation in northern Allegheny County, Pennsylvania. It's quite difficult for me to get good pictures, let alone good pictures with scale, so I'll tell you that the first two pictures are 2 cm (same organism), the second is 5.5 cm and the largest Nautilus in the last pictures is about 6 cm. All information is appreciated, thanks!
  4. Manticocerasman

    Middle Devonian cephalopod prep.

    Last weekend we made a fieldtrip with the “CGH” ( Cercle geologique du Hainaut ) to the quarry “La Couvinoise” , the quarry happens to be in Couvin :p Here the deposits are middle Devonian: Eifelian and Givetian, so a bit older than the locations we usually prospect. The best part for the fossils are the Eifelian deposits, but sadly those layers are no longer in exploitation. However, due to the drought and the low water level we had access to a small but promising scree pile. Here we found a fragmented nautiloid, but the centre of the specimen seemed to be still in the matrix. The prep at home went relatively smooth, the fossil was cracked inside so I had to glue some parts back together, but the separation from the matrix was really smoot. This resulted in my best nautiloid fossil from that time period. As far as the determination goes, comparing it with a few old publications and specimens in the museum in Brussels we probably got a Pleuroncoceras nodosum or a close relative.
  5. Bringing Fossils to Life

    Striacoceras attack reconstruction

    Here is a reconstruction of the orthocerid Striacoceras typum, eating one of the last surviving Eldredgeops rana trilobites. Two Botryocrinus crinoids wave in the current, and a colony of Pleurodictyum feeds on planctonic organisms.
  6. I recently bought this on online with no provenance, from a buyer with 1 feedback and some rubbish photos. To be honest I figured either nothing would turn up or itd be concrete, which is what I was hoping for (needed a doorstop) 'Unfortunately', it appears to be real, and now I'm interested. I'd appreciate any input. I've tried to show the shell patterns in some of the photos, as well as other fossils in the matrix base.
  7. Tidgy's Dad

    Adam's Early / Lower Devonian

    The Devonian period is known as "The Age of Fish", but could also be known as "The Age of Brachiopods." In the Early / Lower Devonian, brachiopods reached the height of their diversity towards its end in the Emsian. We see the ancestral groups occurring, lingulids, craniids, orthids, protorthids, pentamerids, rhynchonellids and strophomenids, as well as the later successful groups we have seen before such as atrypids, athyrids and orthotetids, plus the rise of spiriferids, spiriferinids and productids and the beginning of the terebratulids. By the end of the Devonian , several of these groups are extinct or severely reduced in importance and brachiopods never quite recover. Also, the Devonian is the last time we see trilobites with such variation, large sizes and numbers and orthocerids too are much more uncommon after the rise of the goniatites. The massive tabulate coral reefs also disappear after the Devonian. Fascinating period and I hope to share some of its wonders with you. Equally, a lot of this is rather new to me, so I would be very grateful for any assistance, corrections or further information on my specimens. Thank you. The Early Devonian epoch is split into three stages, so let's start with the first of those, the Lochkovian, that began about 419 mya and finished roughly 411 mya. I have been sent a nice selection of brachiopods from the Kalkberg Formation, Helderberg Group by the Mighty @Misha, mostly. But the kind gentleperson also sent me this fascinating little bryozoan hash : It is dominated by fenestellids, which is usually the case in the Devonian, but other orders sill occur. These ones, I think, are Fenestella, but there are so many species in the formation that I wont take a guess as to species : Not sure what this one is ;
  8. historianmichael

    Texas Nautiloid With A Surprise

    A few weeks ago my brother and I took a weekend trip to do some sightseeing in the Dallas-Fort Worth area. I had been meaning to check out an area of interest in the Late Cretaceous Period, Early Cenomanian Grayson Marl, so early Sunday morning before the museums in Dallas opened I made a quick stop to the site to at least cross it off my list. The outcrop itself was small but I was able to find the usual suspects- Ilymatogyra oysters and Neithea scallops, partial Mariella bosquensis heteromorph ammonites, and a Stoliczkaia conlini ammonite that is sadly missing its juvenile whorls. The real highlight find for me though was a big Cymatoceras hilli nautiloid. Unfortunately it is missing a chunk out of it but it is the biggest Cymatoceras nautiloid that I have found. However, the fun of discovery did not end there. After I brought it home, and as I was taking some extra matrix off, I split the backside of the nautiloid to reveal that a small Mariella rhacioformis ammonite that been pushed inside the nautiloid during deposition. And, as I was further prepping the ammonite with air tools to reveal more detail, I discovered a broken shark tooth, possibly Cretolamna appendiculata, next to it. What I thought was a cool singular find turned out to be an awesome triple discovery.
  9. 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.
  10. Following a refreshing swim at the lake with a few friends over the weekend, I decided to take a spur-of-the-moment stop at a construction site I happened to be driving by. The sun was setting, cooling the area and finally making it hospitable despite the recent heat wave. I was not familiar with the exact geology of where I was, but with only an hour and a half of daylight left I decided to not waste too much time and immediately began scouring the dirt. I quickly noticed that the ground was composed of two distinct formations. The higher layer was a grey limestone while the layer underneath was bright red and filled with a wide range of greens and yellows among other colors. It was only until I got home that I realized these were the Grayson Marl (/Mainstreet limestone?) and Pawpaw formation respectively. My first find was an unexpected, but welcome one. Coming from the grey rock, I noticed a rounded form that stood out against the jagged terrain surrounding it. After prying it out, I was surprised to find that it was indeed a large nautilus (A). Not too long after, I found a couple more that were in slightly worse condition. Continuing my search in the greyish area led me to later find a chunk of Mariella heteromorph ammonite (B) as well. I particularly like this specimen as it is interesting to compare it with my Mariella micromorphs from the Waco Pit and other locations. I also managed to snag a few pretty little brachiopods (C). I have a really difficult time differentiating between brachiopods so my ID for them is a bit iffy, but for now I'll go with Kingena wacoensis. The cool thing about this site is the fact that it sits on the border of two very distinct formations. As a result, one can find a wide variety of fossil life. The rest of the things I brought home from this trip were found in the red Pawpaw formation. For whatever reason, Texas loves to produce pyritized micromorphs. I was surprised to come across a multitude of ammonite genera with that classic bronze coloration I've come to be all too familiar with. I found a few un-pictured fragments of Mariella and other ammonite pieces. I was also able to pocket a few chunks of my favorite ammonite, Engonoceras (D). I didn't really capture its beauty well on camera, but something about the way light bounces off of the broad reflective shell is mesmerizing. I hope to one day come across a complete one. To round off the hunt, I found one last slightly enigmatic specimen (E) that came out of the Pawpaw. Its a big rock with lots of holes running in and out of it. The holes are covered with countless tiny divots. My guess is they are what's left of some crustacean burrows as they bear some resemblance to the poopy burrows I have seen elsewhere online. Some of the burrows have crystallization. Here are the finds: A). A large nautiloid and a smaller one coming from the Grayson Marl. I believe them both to be Cymatoceras. There is some extra matrix on the outside that I am debating on chiseling off. B). A fragment of Mariella heteromorph ammonite from the Grayson Marl. C). Kingena wacoensis? from the Grayson Marl. They have some nice detail! D). Pyritized Engonoceras fragments from the Pawpaw Formation. E). Crab burrows from the Pawpaw? All in all, I'm glad I made a quick stop at this particular site. It's a pretty interesting place with a wide variety of things to be found in a couple of formations I have only just begun to explore. I will likely make another trip there in the future! Thanks for reading!
  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. Took a little trip to Lake Jacksboro spillway and concentrated on the microzone hoping to find some of the little goniatites and nautiloids. Only found a couple that were "big enough" to see , but once I went through my bag of matrix, I was happy to have found quite a few of the microfauna! A few I am not sure of the ID so any help is appreciated! All of these are 1/8 to 1/16 inch Goniatite Peritrochia sp. Nautiloid Gastrioceras listeri same as above, I think Goniatite Prouddenites bosei Goniatite Cardiella ganti Goniatite Pronorites sp. Not sure what this one is: Nor this one. A few other nice little finds I think this is a shark spine: A scaphopod Plagioglypta sp. a tiny whole Rostroconch (had only found half ones prior) and a Trilobite spine!
  13. Creek - Don

    Central Texas Nautiloid

    Hi everyboy. I stopped by the road cut near I14 and I35 in Belton, Texas today and found these two nautiloids lying side by side. Are these Eutrephoceras nautiloids? I have never found these before. I looked at geologic map, and it's showing up as Weno Limestone and PawPaw Formation. One measures 120 mm and smaller one at 100 mm.
  14. It took some time, but thanks to Covid-19 (!! - see acknowledgements) its out now: A Systematic Study of upper Silurian (Ludfordian) Nautiloid Cephalopods from the Eggenfeld Section (Graz Palaeozoic, Styria, Austria) (pdf, external site) Here is my last visit to that site: Visiting some of the oldest fossils of Styria, Austria (Silurian orthocerids and brachiopods) - Fossil Hunting Trips - The Fossil Forum Best of all, some of my former specimens are pictured in that paper, especially some polished sections (see acknowledgements). Franz Bernhard
  15. Near the shores of the south-eastern Randsfjorden in Norway is a loaction with an Early Silurian outcrop. Last summer I found some gastropods and this nautiloid in a road-cut on a rock which seems to be sandstone, of very hard material. It seems to be an orthocone, although very slightly bended with the siphuncle visible on the top cross-section, placed in a semi-central position. Could it be possible find out which order and family it belongs to? I guess it is not an endoceras, because the siphuncle is not very large. The lenght of the speciemen is about 12cm. At the same location I found a very beautiful rock with several animals, two nice gastropods, which I not know the order of, and one or two other nautiloids. The rock is about 7cm broad. One big and one very small gastropod:
  16. PaleoOrdo

    Nautiloid or trilobite?

    I wonder if this fossile is a trilobite or a nautiloid, from Late Ordovician in the Oslo-field, Norway.
  17. My next door neighbor, Jim, was kind enough to take me to my cataract surgery today, and after I took him out to breakfast, we had a little time to kill before my follow up appointment. On a whim, I suggested an Austin Chalk creek stomp since current drought conditions wouldn't result in muddy shoes. It was a fortuitous move, as the creek outperformed expectations. The bedrock there is slow to erode, so I've rested the site for a few years. We got 2 nice Eutrephoceras nautiloids. The one that Jim is posing with below is now cut to a nice pedestaled display piece which I presented to him and his wife tonight. (And I kept one eye closed while running the rock saw...left eye surgery is tomorrow, so no more flying rock dust for a few weeks.)
  18. Bringing Fossils to Life

    Spyroceras?

    Hi everyone! I was going through my Swatara Gap fossils when I came across this specimen, which I had originally thought to be coral. However, it looks similar to pictures of Spyroceras I've seen. Can anyone help? The first picture shows the texture, the second picture is a cross section, and the third picture is an imprint on the other side of the rock that looks cephalopody.
  19. This was my first trip to Trinity river in Tarrant co., this section was close to borders of QT and QAL and didn't know what to expect. I certainly didn't expect to lift up rock and find a Nautiloid/Nautilus still soft in the marl. Have no idea what the marl was or how to determine age of this. Only prepped it a little afraid to mess it up. Tooth from same place and hesitant to call it bison since they're always bovid.
  20. Samurai

    Nautiloid in phosphatic nodule

    Location: Missouri Period: Pennsylvanian Formation: Iola Limestone (Muncie Creek Shale Member) (MO) hello! this is my first nautiloid in a phosphatic nodule from this locality and unfortunately the split wasn't desirable, nevertheless you can see the inside beauty of this specimen I know the genus Prouddenites have been found in these phosphatic nodules as the user Missourian happened to have a post from a couple years back showing his specimen the only issue is with mine its harder to see what it is since the outer shell isn't that visible, any tips on identification or can anyone identify it from its internal portions? I can take more pictures if neccesary Most detailed section: in the middle upper section of this piece had a bit of the shell shown from the underside Measurements: when cracked the little middle section popped out, I was fortunate to find it
  21. Finally finished some new artworks! Ammonites and Nautiloid is 56" x 30"....it's a big one! Trilobites18" x 24"
  22. Rogue Embryo

    Orthoconic nautiloid?

    Hello. Any comments on this find (3 photos below) at Mimico Creek in Toronto (species, anatomy, etc.) would be appreciated!
  23. I_gotta_rock

    Nautiloid

    From the album: Delaware Fossils

    Late Cretaceous Eutrephoceras dekayi from the C and D Canal in Delaware
  24. PaleoOrdo

    Nautiloid or graptolite?

    I wonder if this fossile in a shale is a graptolite or a nautiloid. The length is about 3cm, age middle ordovician, in the Elnes formation. The place has many graptolites. Pict. 1 Pict. 2 I also found this 1,5 cm long specimen, which seems to be a nautiloid?
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