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  1. Mikrogeophagus

    A Classic Hunt on the NSR

    I think North Texans will relate when I say that now and then, the urge to take a drive out to the NSR and spend the day hunting some Campanian gravel bars can spontaneously take complete hold. I had one of those moments just after the series of heavy rains and powerful winds our region encountered some days ago. Previously, my luck with weather at the NSR had been rather poor. Each time, the temps were either nearing a hundred degrees or only just above freezing, making a full on adventure crossing muddy waters and crawling atop unshaded gravel beds too much to handle. I had yet to experience a proper adventure at this historic site, so I decided that this week would be the one where I changed that. Luckily, my friends @PaleoPastels(Lari) and Cole where kind enough to invite me out to their special spot along the river. After waking up bright and early, I got in my car and followed the rising sun. After jumping out of our vehicles and exchanging brief greetings, we quickly slid our way down to the shale bed and beelined for the first bar. Cole has a bit of an aversion for water, so he stuck around at the entrance for most of the day while Lari and I got our clothes wet hopping from bar to bar. The weather and water temp were absolutely perfect, and the lack of footprints assured us it would be a productive day. It's not often you beat the crowd to a place as popular as this! Although I maintained measured expectations coming in, the sheer variety of strange and interesting fossils/artifacts that are known to come from this area kept me on my toes from the outset. When we arrived to the first bar, we started off strong, picking up a variety of shark teeth. Lari had an eye for them, immediately spotting a few super big Scapanorhynchus texanus, a staple of the Ozan Formation. Despite my protests, she was very generous in donating a few to me due to my limited NSR collection . Finally one I spotted myself! Scapanorhynchus texanus Scapanorhynchus texanus of the day. Some may be Carcharias samhammeri as I am still working on differentiating the two. In between crawling the gravel, I did some sifting which yielded a few interesting specimens including Squalicorax kaupi, Cretalamna sarcoportheta, Carcharias samhammeri, and a vole tooth which I will ignorantly assume to be Pleistocene in age. Cretalamna sarcoportheta, Squalicroax kaupi, and Carcharias samhammeri Sifting also yielded a plethora of shark vertebrae and I was fortunate enough to come across a beautiful spiral shark coprolite. I found one solitary coral which I assume is Trochocyathus sp. Shark verts, shark coprolite, and Trochocyathus sp. As I scanned the gravel looking to spot a complete Cretalamna, I was instead met with the first mosasaur tooth of the day! It was mostly in tact and showed some nice detail. I was relieved to know the entire trip was already made, and I could spend the rest of my time playing with house money. The only other mosasaur tooth previously in my collection has a beat up crown, so this new specimen certainly complements it. Don't know much about mosasaur genera in the NSR, but I will go with Tylosaurus proriger for now. Throughout the day, we also found tons of very large Enchodus fangs and jaw sections. I'm so used to finding these teeth in their miniature forms as I sift for micros, I almost forgot how big they could get. Lari did good with spotting the Ischyrhiza mira rostral teeth and quickly built up a small collection. She was nice enough to give a large one to me. Top: Fused fish vert and Pachyrhizodus tooth. Bottom: Enchodus jaw section and large fangs. Ischyrhiza mira By now we had hopped a couple of gravel bars and there was still plenty ways to go. It took me longer than it should have, but reaching the third bar finally brought me a large tumbled mosasaur vertebra. Not far from it, there was a section of finer gravel. Used to the routine, I once again got close to the ground and began scanning every pebble. After tossing the millionth shrapnel of shark tooth, I finally locked eyes with the most perfect mosasaur tooth I had ever seen. As I picked it up, I could tell something wasn't right, however. Of course the best side was on full display, but the rest of the tooth was cleaved cleanly off. Oh well, at least it'll look nice in pictures. Not long after, I found a second mosasaur tooth that was decently complete and hooked albeit tiny. Two nicest mosie verts. A slice of an exquisitely preserved mosasaur crown. The next oddball find came awhile later. My initial impression was that it might have been a segment of a Xiphactinus tooth, but the curvature suddenly ended along one of the edges of it. At this sudden end, there were two columns of small protrusions running longitudinally. I was debating on throwing it out, but my history of carelessly tossing neat finds convinced me to play it safe and take it home for identification. I'm glad I did because after the hunt, I immediately googled my hunch and it seems to be correct. This is a fragment of a hybodont spine! I wish I could pin down a more specific ID, but the info on them seems limited. I will say that, out of Moss Creek, I had found a tooth belonging to Lonchidion babulskii last year which could be the culprit. Quite an uncommon find for the NSR! Wondering if any shark experts here might have any ideas @ThePhysicist@Al Dente. Hybodont fin spine. Lonchidion babulskii is a candidate. By the penultimate gravel bar, I thought the best finds had surely been made. All day Lari had been talking about how this was THE spot to find Globidens teeth and how every visit she would find at least one fragment. Well, the walkable land was starting to run out and she expressed how disappointing it would be not to come across one that day. I find Globidens to be really interesting, but I think of it as one of those finds I would never expect to make on any given hunt. For me, not finding one would not define the day as a let down. As I was beginning to form those thoughts into words, I reached down to pick up a circular fragment of a tooth with a peculiar texture. Finding the right angle of light soon revealed the undoubted best find of the day: The top of a Globidens sp. crushing tooth! The whole day I had been hallucinating "finding" Ptychodus teeth. Funnily enough, this may very well be the tooth that ended their supremacy as shell crushers of the WIS. Seems too coincidental that Globidens suddenly appears right around the last occurrence of Ptychodus. I wonder if they directly competed Ptychodus out of existence or if Ptychodus went extinct on its own and mosasaurs simply filled in the niche . I don't think the Globidens of the Ozan Formation has been formally described yet. Globidens sp. Mosasaur teeth of the day! Despite having hunted for over a year in the creeks of Austin, I am surprisingly bad at spotting artifacts. Throughout the span of the day, the both of us had found a few chert flakes, but no sign of anything more even as I was trying to make a conscious effort to spot one. On the same bar as where the Globidens sp. was found, I noticed a worked edge of stone so big even someone as archaeologically blind as me could never miss it. Without an ounce of self control, I yanked it from the sand before I could finish yelling the word "arrowhead"! I seriously need to work on milking the moment . I did a little bit of searching online later and found that the point is likely a Darl or Hoxie. Both put its age in the thousands of years! Darl or Hoxie point. It measures 8.5 cm in length. On the way back, we kept our eyes peeled for anything we may have missed. I was sifting random spots of gravel, but not having the most luck. Lari casually handed me rock with a pearly white exterior and triangular shape. It was the most textbook mastodon I had ever seen, but she wasn't very impressed with it. She told me she had many of these already and that nonmarine fossils didn't interest her. I won't say I understand her terrestrial prejudice, but I will withhold my complaints since it meant I had acquired my first significant chunk of proboscidean . Mastodon enamel, mammoth enamel, and vole tooth. We finally reached Cole at the entrance. In our absence he had wondered off the other way and found a neat spider to pique his entomology interests and pocketed a few fossils. We managed to make it out by the mid afternoon, but I was so exhausted and content, I couldn't bother checking out any other spots along the river. The spoils of the hunt were amazing, but most of all I was happy to finally experience a classic hunt on the NSR as I had seen so many post about before. Doing it with a couple of friends made the adventure even better! Sadly this place has got not much time remaining, so those of you who have stumbled upon this post, maybe take it as a sign to give this historic spot one last go before the opportunity floats away. Thanks for reading!
  2. Mikrogeophagus

    Bony Oddities of the Ozan

    Following the brief rains from earlier in the week, I decided to make a return to my new favorite Ozan outcrop where I had previously found so many mosasaur vertebrae. Though I did not get to add any new verts to my collection, I did manage to come across plenty of unique fossils and artifacts that have taken up my attention for the past couple of days. One interesting thing I have noticed from this outcrop is its abundance of pyritic bony material among other pyritic fossils (including "rusty" exogyra shells + bivalves). Most of them are unidentifiable chunks, but a few have enough distinctive features that I feel hopeful they can be identified. Some give off the flaky appearance of fish bones while others are more spongy and reptilian to my eye. I wonder if any others have come across similar fossils as I haven't seen much online that resemble these. Does anyone know what these strange little balls of bronze rust are? I assume it's pyrite degrading, but I'm not 100% confident. They seem to enjoy popping up on bony bits that come from this Ozan outcrop. Anyways, I have compiled the most interesting bony oddities from my two trips to this spot. I know there's a lot to take in, so I only included closeups of the most distinctive pieces in order to have the majority of the focus fixed onto them. If you would like additional closeups of anything here, feel free to let me know! Here is an overview of the finds: Closeups and Descriptions: A: Here is a 360 view of my favorite one of the bunch. A key feature is on the sixth image, where you can see a hole that runs through the bone (the white speck towards the top end). This give off a flaky look, so I think it may be fish. Then again, I could see this being the end of some sort of long bone. There is a symmetry to the bone as well as the little rusty protrusions that are characteristic of the things I have been finding. The grooving seen towards the bottom on picture 5 is very pronounced. I feel this might be to something really cool. Curious to hear what y'all think! B: This is an interesting piece that is unfortunately almost entirely covered in pyrite chicken pox. It's difficult to tell what exactly the bone's texture is, but I would flaky as well. One side (pic 4) is mostly flat. The opposing side (pic 2) has a groove running down the middle that converges at one end. Pic 6 shows this convergence pretty well. C: The spongy texture in pic 5 leads me to think this is reptilian. I get a vague sense that this may be turtle, but who knows. At first glance, the notch in it seems like a random natural fracture. However, the grooved patterns on two of its faces radiate out of that notch, so I think it must have always been like that. D: A flat piece of flaky bone I think is from a fish E: A flat piece of flaky bone I think is from a fish F: A 3D piece of flaky bone I think is from a fish G: A spongy bone that resembles turtle in my opinion H: This is a pyritized disk that I included in a previous post. I decided to throw it in here since it is similar in nature, though not collected from the exact same location. I think it may be a shark vertebra, but its protruding center throws me off. Someone has suggested it to be an intravertebral disk. It is fairly degraded. I tried to look around the outcrop itself for bones, but didn't come across any. However, I spotted and managed to pry out a pretty little cretolamna tooth so I will make sure to always check it out in the future. Thanks for reading!
  3. Still_human

    Mini Mosasaur collection

    From the album: Marine reptiles and mammals

    A little collection of assorted mosasaur fossils from 2 different places that I got when I first started collecting. 2 different types of vertebrae, one is mosasaur, and the other is a questionable claim of mosasaur, a corprolite that was claimed to be that of a mosasaur, a tooth, & 7 rib fragments. 2 ribs have predation marks, as well as the large vertebra. The large vert has a round tooth indent on the very center. The 2nd rib down has tooth scratches along the surfaces, & 3rd rib down has a round tooth indent in the center, which is probably what caused a strip across the middle to break off. There are 2 other tooth marks on that rib as well, forming a diagonal line from above left of the center indent, breaking off a piece along the top, to below right.
  4. Still_human

    Xiphactinus vertebrae

    From the album: Sharks and fish

    Xiphactinus Audax vertebrae NorthEast texas Ozan Formation--Taylor shale upper cretaceous
  5. Tony G.

    Squalicorax kaupi

    Collected in gravel in the North Sulphur River near Ladonia, Tx.
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