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Found 15 results

  1. From the album: Virgilian Series

    Paraconularia crustula, Jacksboro Finis Shale, Graham Fm Feb, 2023 Jacksboro is one of the few sites where Conulariids are a common find. These enigmatic fossils are thought to belong to Cnidaria. Conulariids are actually known to produce pearls, though I'm not sure if these have been discovered specifically at Jacksboro.
  2. From the album: Virgilian Series

    Rhynchopora magnicosta, Jacksboro Finis Shale, Graham Fm Feb, 2023 A rare find for Jacksboro!
  3. Mikrogeophagus

    Fimbrinia plummeri, Finis Shale, Graham Fm

    From the album: Virgilian Series

    Fimbrinia plummeri, Jacksboro Finis Shale, Graham Fm Jan, 2023
  4. I heard from a friend that someone recently posted a bryozoan I found here but I missed seeing it and I can't find it so they may have been mistaken. However, that reminded me that I had only posted it on Facebook so I thought you might like seeing it here too. I'm pretty sure it is a Tabulipora carbonaria which must have been named by a lumper since it appears in such a wide variety of forms. It can be branching, encrusting or massive. The latter is how you describe one than is self-encrusting, forming a sub-hemispherical mound, much like a stromatolite. This is one of the branching forms and came from the Finis Shale of Jack County Texas, a Late Pennsylvanian member of the Graham Formation. The ones I usually find are much smaller, with a diameter less than 3 mm. When I walked up on this I thought it was a burrow infill until I noticed the zooecia. Then I assumed it was the encrusting type until I look at a cross-section with a loupe. Maybe some of you find them this big normally but this is a first for me. In situ image ready to assemble close-up of side closer end view, millimeter scale close-up of end
  5. BobWill

    Pennsylvanian "jaw"

    I found this in the Finis Shale member of the Graham Formation, Late Pennsylvanian, near Jacksboro Texas. Almost everything from there is marine material. They were found in screened, washed matrix laying right beside each other, even after all the handling they went through! They may well be from an extant critter so I might need to ask the opinion of a vertebrate biologist about the possibilities. They may not even be teeth, but it sure looks like teeth. The scale is millimeters.
  6. As I have been researching large ctenacanthiform sharks from North America, I've been wondering if there are any known globally that are currently unnamed. I definitely know of the large Ctenacanthiformes Saivodus stratus (found in both what is now North America and Great Britain), the large Ctenacanthiform from the Permian Kaibab formation in Arizona, and the 'Texas supershark' (a likely large species of Gilkmanius) from the Pennsylvanian Texas Graham formation (all three as larger or larger than an adult Great White Shark (Carcharodon carcharias)). But are there any large ctenacanthiformes (at least in size comparable to a modern day adult Great white shark (Carcharodon carcharias)) currently unnamed that are also known? Ctenacanthiformes are known from North America, Greenland, Europe, Asia, and South America. https://www.mindat.org/taxon-P34476.html Even though study of Ctenacanthiformes as a whole is just starting to become more through within the past few decades, I'm wondering if anyone on the forum is aware of any currently unnamed Ctenacanthiform fossils from areas outside of North America of Great White Shark (Carcharodon carcharias)) size?
  7. The Pennsylvanian of Texas is a strange and exciting place. Even though I've been going at this whole fossil hunting thing for about a year and a half, my experience in this age of rock is extremely limited. And yet, many of my most prized specimens have come from such hunts. I've had the pleasure of visiting a few of the more prominent Pennsylvanian sites to be had around Central Texas, but now that I'm back up North, I thought it would be prime time to check out a spot that many have put in good words about. Another local collector, @PaleoPastels, had also been dipping her toes in the Paleozoic, so we decided to go for a group outing along with her entomologist roommate to the famous Lost Creek Reservoir in Jacksboro and a couple of Bridgeport localities! Unfortunately, @BobWill couldn't make it for that day, but he was nevertheless very helpful with providing guidance and advice on hunting the Finis Shale. Nothing beats first laying eyes on a distant exposure. The walk felt like an eternity! The day started off early and, after a bit of confusion , we managed to make it by about 9 am. The air had yet to be warmed by the sun, so we were all feeling a little chilly as we walked to the bluffs, simultaneously exchanging gifts and introducing ourselves. I was relieved to find that Lari was just as nice as her online personality made her out to be and we got straight to chatting about, well, fossils. Cole wasn't as big on fossils as Lari, but he still showed good enthusiasm. We weren't expecting trilos here, but I was crossing my fingers that we'd get some in Bridgeport to fulfill his entomology interests. Looking to the left and to the right on the Jacksboro slopes Once we reached the grey base of the bluffs on the far right end, we were all immediately hunched over, gathering up bits and pieces of the wide diversity of fauna present at the site. The ground was literally covered in millions of brachiopods, cephalopods, and gastropods. Some of my favorite things to pick up were snails of the order Bellerophontidae. They've got such a unique look to them that drastically differs from the gastropods of the Mesozoic and Cenozoic. A Pharkidonotus percarinatus gastropod still in matrix We steadily made our way to the left, scuttling up and down the slopes over and over again. The initial excitement had waned and the pace of finds slowed; Now we were really trying to focus on getting some of the rarer/cooler stuff. Throughout the morning, I had been yapping away about conularids: How strange they are, how I was really hoping to find one, how this was the one place where they were almost common, etc. I thought we'd have found one a lot sooner, but the lack of results and recent rain got me a little nervous, I must admit. I was starting to regret talking about them so much, especially when Lari and Cole began getting more interested in them. Surely this place was so big, it couldn't run out of them, right? A recreation of how I found the first conularid of the day Well, I guess the place is big enough because the first conularid of the day was at my feet before I knew it. It's beat up, but the enigma surrounding this animal is enough put it on the top shelf. Throughout the day, I found a handful more. I offered some to Lari, but she would not be satisfied until she found one on her own, which I understand. To find out if she and Cole scored any, you'll have to wait for her side of the story . Fimbrinia plummeri Not so far from the first conularid, I picked up my favorite brachiopod of the day. This specimen was extra shiny and had some nice pointy spines, warranting placement in my rares/delicates ziploc. I thought I had reached the peak of the day when I was forced to stop mid conversation. Inches from my face, I spotted the subtle glint of wrinkled enamel attached to an inconspicuous pebble. If I hadn't seen one of these featured on the forum last Spring, I'd probably have moved right past it. The first fragment I gazed upon was the largest and very clearly belonged to the shark, Glikmanius occidentalis. I hurriedly gathered two more smaller chunks and tried to reassemble the tooth. Glikmanius occidentalis cladodont shark. Don't worry, I figured out to flip that smaller fragment around by the time I consolidated everything! Unfortunately, the tooth crowns and a piece of the base were nowhere to be seen. There was a little valley next to it, so the other bits may have been washed away for all I know. Nevertheless, these teeth are simply awesome. I have a soft spot for shark teeth, so a charismatic find like this will always be a trip maker! I wonder if ones with cusps still attached have ever been found? Consolidated tooth. It's pretty, but I'll admit @historianmichael has me beat with his from earlier in the year! We rounded off our time in Jacksboro checking out the far left side of the exposure, mostly around the flats. There, pyritic cephalopod micromorphs could be found in excess. Shown below is my best specimen from that area: Wiedeyoceras pingue? Thus, our time at Jacksboro had run its course and the path was set for Bridgeport. Lari was kind enough to share some turkey jerky and the best blueberry muffin I've had in a long time. We all had some nice finds out of it, but I'm sure the place is a lot more productive if caught right after a storm. This spot is definitely due for a return. After identifying everything at home, I now have a list of over 55 unique species to show for the hunt! Bob and DPS have pooled together some great resources for researching IDs, but it was nevertheless an exhaustive (and satisfying) process. Bridgeport Prior to the trip, I did some recon and found a short list of cuts around Lake Bridgeport for us to visit. Since the day was already getting a bit late, I decided we should visit only the best two of the list which exposed what I believe to be the Bridgeport Shale. It was a pretty short drive and soon enough we were back together with our eyes glued to the ground at the first spot. We were on the look out for trilobites first and foremost. Within about 5 minutes, I found the first trilobutt! First trilobutt of the day I'm not sure if there is more trilobite within the nodule, but I will try to work it down and find out. Unfortunately, the trilobites did not start popping up like crazy as I had hoped. Instead, we were mostly collecting gastropods and the occasional horn coral. I did at least manage to find a pretty death assemblage of Trepospira snails. Trepospira snails I will say the red stone eventually gave me some bad flashbacks of Woodbine busts from the past. At times, it felt like I was hunting in a pile of unfossiliferous landscaping gravel. As we began wrapping up, I managed to pull a chunk of matrix with some trilobite material on top, but I wouldn't say it's anything too impressive. Trilobite material We took a short drive over to the second and final cut which exposed the same sort of rock. I got skunked at this spot, but Lari and Cole each managed to snag their own trilobite and had success splitting the various nodules. I was happy we all came out of Bridgeport with some trilobite material to show for it! The day felt like it was gone in a flash, but my body was definitely calling it quits. It was fun to meet up with another forum member and explore some unknown territory. A future second get-together is for sure in the cards after some rainy weather . Throughout writing this report, I've left out a lot of awesome finds so Lari can share them herself. So, keep an eye out for her side of the story! Anyways, here is an overview of the finds: Top L to R: Metacoceras sp., Gonioloboceras goniolobus, Brachycycloceras normale, and Euloxoceras greenei 2nd Row L to R: Pseudorthoceras knoxense, and Ephippoceras sp. Bottom L to R: Rugobactrites jacksboroensis, Wiedeyoceras pingue?, and Domatoceras sp.? Top L to R: Lophophyllidium spinosum, Paraconularia crustula, and Lophophyillidium plummeri 2nd Row L to R: Fusunilids, and Incrustospongia meandrica Bottom L to R: Fenestella sp., and Tabulipora sp. Note: Syringopora sp.? not pictured Top L to R: Rhipidomella carbonaria, Neospirifer dunbari, and Punctospirifer kentuckyensis 2nd Row L to R: Lissochonetes geinitzianus, Wellerella osagensis, and Neochonetes granulifer Bottom L to R: Meekella striatocoastata?, Crurithyris planoconvexa, and Hustedia mormoni Top L to R: Hystriculina texana?, Echinaria semipunctata, and Kutorginella lasallensis Bottom L to R: Composita subtilita, Kozlowskia splendens, Fimbrinia plummeri, Eridmatus texanus?, and Phricodothyris perplexa Note: Differentiating between Hysticulina and Kutorginella was a bit of a challenge. Top L to R: Glikmanius occidentalis, Archaeocidarid plate Bottom L to R: Various crinoid parts including a regenerating spine on the far right. The spine left of it has strange circle impressions on it. Top L to R: Nuculopsis girtyi, and Astartella concentrica Bottom L to R: Yoldia glabra, and Allorisma costatum? Top L to R: Cymatospira montfortianus, Knightites tennulieata, Pharkidonotus percarinatus, and Euphemites vittatus 2nd Row L to R: Euphemites multiliratus, Knightites tennulieata?, Trepospira illinoiensis, and Glabrocingulum grayvillensis Bottom L to R: Worthenia tabulata, Soleniscus primigenius, and Strobeus paludinaeformis Top L to R: Amphiscapha subrugosa, Donaldina sp.?, and unknown gastropod Bottom L to R: Pseudozygopleura semicostata, and Meekospira choctawensis Hashplates: Bridgeport: Thanks for reading!
  8. The Ctenacanthiformes are an impressive group of prehistoric sharks, emerging in the Devonian period before surviving the two Devonian extinction events that gave rise to the Carboniferous. During the Carboniferous, the Ctenacanthiformes diversified rapidly, even becoming some of the Carboniferous Oceans Apex Predators. But of all the members of this impressive (yet almost unknown to the general public) group, two species stand out as especially impressive and awe inspiring - Saivodus striatus and the Graham formation Gilkmanius (this species currently doesn't have a name yet). Duffin, C. J., & Ginter, M. (2006). Comments on the Selachian genus Cladodus Agassiz, 1843. Journal of Vertebrate Paleontology, 26(2), 253–266. https://doi.org/10.1671/0272-4634(2006)26[253:cotsgc]2.0.co;2 Ivanov, A. O. (2005, September 1). The revision of "Cladodus" occidentalis, a late Palaeozoic ctenacanthiform shark. Acta Palaeontologica Polonica. Retrieved December 29, 2022, from https://www.academia.edu/49013029/The_revision_of_Cladodus_occidentalis_a_late_Palaeozoic_ctenacanthiform_shark Artist reconstruction of the skeleton and size of the Graham formation (Upper Pennsylvanian, Carboniferous) Gilkmanius sp. By J. Maisey. Image Source: https://www.amnh.org/explore/news-blogs/research-posts/ancient-supershark-fossils-found-in-texas Maisey, J. G., Bronson, A. W., Williams, R. R., & McKinzie, M. (2017). A Pennsylvanian ‘supershark’ from Texas. Journal of Vertebrate Paleontology, 37(3). https://doi.org/10.1080/02724634.2017.1325369 Artist reconstruction of an Adult Saivodus striatus and its size compared to an adult Human and adult Great White Shark (Carcharodon carcharias) by artist HodariNundu. Image Source: https://www.deviantart.com/hodarinundu/art/Super-Sized-Saivodus-866628428 Hodnett, J.-P. M., Tweet, J. S., & Santucci, V. L. (2022, August 8). The Occurrence of Fossil Cartilaginous Fishes (Chondrichthyes) within the Parks and Monuments of the National Park Service. researchgate.net. Retrieved December 30, 2022, from https://www.researchgate.net/publication/362806168_THE_OCCURRENCE_OF_FOSSIL_CARTILAGINOUS_FISHES_CHONDRICHTHYES_WITHIN_THE_PARKS_AND_MONUMENTS_OF_THE_NATIONAL_PARK_SERVICE Both were giant members of the Ctenacanthiformes and were on par in size with the largest Great White Sharks (Carcharodon carcharias) (which can reach lengths of 20 feet). But the question I have is which species was bigger (in weight and in length)? Which one was the biggest of the Ctenacanthiformes? @Elasmohunter @BobWill @connorp @deutscheben @jdp What do you think?
  9. This came from the Late Pennsylvanian, Jacksboro LImestone of the Graham formation near Jacksboro, Texas. At first I thought it was Shansiella but the flat bottom and huge umbilicus doesn't fit. It is 4 cm across and 3 cm high with the tip of the apex probably missing.
  10. Here are three views of a 9 mm "Peritrochia sp." Girty 1909. It was found at the Lost Creek Lake spillway in Jacksboro. This proves that even a broken, partial fossil is worth taking home. In the first position you see the elaborate suture pattern characteristic of these Goniatites on the outermost whorl preserved. Notice the slight horizontal groove near the bottom edge. As it turns to reveal the next whorl below you can see the siphuncle as a vertical line and the outer edge of a septum, or chamber wall, at the bottom. Turning into the innermost whorl the septum comes into view at the top and the siphuncle is visible again. Here you also see another shallow groove crossing horizontally. These "constrictions" are found on some Pennsylvanian Goniatites. Peritrochia.mp4
  11. I found this bivalve at the Lost Creek Spillway in Jacksboro Texas, Graham Formation. It's 30mm across and it came attached (post-mortem) to a nautiloid fragment. It has been suggested that it could be Pseudomonotis sp. possibly based on it's inclusion on the fauna list but it sure looks more like either Dunbarella rectilaterarius or D. knighti neither of which are know from the site. Maybe it is some species of Pterinopecten from the Pennsylvanian if there are any. Any help would be great.
  12. I found my first Stenopoceras sp. from the Finis Shale member of the Graham Formation at Jacksboro Texas. I thought it was an oddly-shaped version of the more common Grypoceratid from there, Domatoceras scuptile until I noticed the concave venter. I went through my drawer of Domatoceras fragments and found another partial one after I studied the differences a little. That one was just part of one side and had nothing of the venter but a part of the apertural margin was showing, something I don't remember seeing before. Both are external casts so no sutures but the faint growth lines are visible. The phragmocone is crushed and I believe the septum is the last one so most of the specimen is the body chamber which is about 67mm across. Those holes sure look like punctures and the shell is mostly gone from the opposite flank. This view shows the crushed phragmocone and the septum for a look at the whorl profile which is taller than the more "squatty" Domatoceras. It was in about 7 pieces and I just now figured out where the last one fit. I hope I got all of it that was still there.
  13. DPS Ammonite

    Articulate Brachiopod

    This is a less common brachiopod collected at the rich Finis Shale site in the spillway of the Jacksboro Reservoir. It is often confused with the more common Composita subtilita which has a stronger sulcus fold and no small spines.
  14. BobWill

    Pennsylvanian Shark Tooth

    Photo featured in "Marine Shark" section of Color Guide to Pennsylvanian Fossils of North Texas by Mark McKinzie and John McLeod. Labial face. Missing root and extreme tip on right end of photo. EDIT: Pennsylvanian is Subperiod, Late is Epoch.
  15. DPS Ammonite

    Articulate Brachiopod

    This is a large specimen of a common brachiopod with encrusting Serpula sp. collected at the rich Finis Shale site in the spillway of the Jacksboro Reservoir.
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