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Found 30 results

  1. Can this be identified as Dunkleosteus? It's from Ashtabula, Ohio on auction site.
  2. This is continuing the first post. The Tioga site is a near shore exposure of the entire Catskill formation. So besides the general Holoptychius and bothriolepis fauna, lungfish have been described from a skull table and tooth plates. Here is a tooth plate from Dipterous fliescheri. A similar plate was described from the Troy, PA area.
  3. Paulding, OH (Dev.) 7/28/19

    Found the usual goodies at Paulding today. But I'll only show this photo of a nice, thick chunk of Placoderm armor. This is embedded in hard limestone, so I think it's from the underlying Dundee Limestone Fm., rather than the Silica Shale Fm. (For those unfamiliar with the Paulding Locality, these are quarry dump piles). This is one of two placoderm pieces I found today. The color alone makes this a desirable find, let alone the cool factor of what it is.
  4. Bone piece from Penn Dixie

    I had a chance to visit Penn-Dixie today and one of my first finds stumped me. It has the signature porous inside of a bone. It’s black. It has radiating lines down one side. Folks running the place thought it was likely a piece a placoderm armor, making it a rare find. Apologies for the pictures. Once again I find myself in a hotel with my phone. Thickness is a bit over a quarter inch. Length is around 1.75”. Couldn’t make the phone focus well on the marrow. Does placoderm armor have marrow?
  5. Back during an April trip to the Widder Formation (Mid-Devonian), I came upon a rather sizeable placoderm. It is very likely the arthrodire, Protitanichthys sp., although it is a bit of wastebasket taxon, but new research is underway. It was pretty much stuck in this rock, and it was only going to come out the hard way. I collected every little bit I could find from that dirty, messy bench, including the impression. Here is the in situ photo:
  6. It's been about five months since I've been able to get out and dig, so when my collecting comrade and I arranged it, off we went. The weather was perfect, although it was muddy going. Spent about a day and a half at our site. Finds were not the best for some species, but the focus was more on site preparation. Pictured here are some Greenops widderensis. Both are missing parts, so will likely be in the grafting pile:
  7. Although we are currently in the depths of February, spring is just around the corner! With spring comes spring break and a week of digging!! One of the locations I am planning a visit to is Jamesville quarry in Jamesville NY. I would love to unearth some nice placoderm pieces. If anybody has info about the site, especially who to contact for permission, I'd greatly appreciate it!
  8. Somewhat fishy

    Ahoi, I just finished a model of Dunkleosteus the lazy way, because I don´t have that much time these days. Lazy way means: Skull is a bought model from kaiyodo dinotales, postcranial is a skeletal drawing by Scott Hartmann I modified slightly and printed on some transparent foil. Like the outcome. It is quite small though, only 15 cm, representing a meager 3m in my chosen scale. can anyone tell what the other two are? both recent species, one handmade after a photograph, the other 3d printed from ct data. As I don´t know if I can add tags after posting , I just added the ones I may put in this thread if I ever find the time to build them. After all my Whales, other marine Mammals , Birds and Reptiles I thought it would be nice if I could include some more Reptiles and "Amphibians" (?) If it crossed the border between land and sea, its likeness shall be built by me -some day. -Placodus -Cyamodus -Mastodonsaurus -Tiktaalik -Ichthyostega -Diplocaulus Aloha, J
  9. Dunkleosteus armor/possible jaws

    From the album Sharks and fish

    Front side of armor which I believe could be the edge of the jaws! It comes to what would have been the razor sharp shearing edge, greatly worn down now, though. I also believe it could be the jaw because of the clear vertical wear lines on the surface, from being sheared against the inner surface of the other jaw, which is how they kept the edges razor sharp like scissors. I have seen similar wear lines on placoderm shearing jaws, so what I believe to be reasonable observations point to the possibility(maybe even likely?)of being from the cutting edge of the jaws.
  10. Dunkleosteus armor cross section

    From the album Sharks and fish

    Cross section of dunkleosteus' armor plate showing internal structure of mostly solid bone
  11. Dunkleosteus armor

    From the album Sharks and fish

    Part of dunkleosteus' amazing armored head
  12. Hi Folks, A couple of weeks ago we went on a 5 day trip around NSW to find a few different fossils which I'll post another day, but here are some of our best finds from near Cowra, NSW Australia. So in a nutshell, there's a quarry near Cowra that was quarried to be used as road base in the area, and thats how these specimens were found. You can find blocks of the stuff on the side of the road if you're lucky. Since you can't get into the quarry nowadays because the owner has pretty much lost the plot this is the only way to collect material. #1 Cowralepis mclachlani. This is one of a few species of fish at the site and is by far the most common. We have never found any other species there. Continued...
  13. Last Sunday we had a trip to the sandy quarry near St. Petersburg. Near of the sandy quarry there is a small village called "Novinka" (coordinates of this place on Google maps: 59.161362, 30.380684) Quarry near Novinka is a fairly large quarry, developed in the sands, introduced here in the Devonian (about 400 million years ago). The quarry is very picturesque and extremely interesting, there are mottled sands with a great variety of sedimentary textures deposited in various water conditions. During most of the Devonian Period, North America, Greenland, and Europe were united into a single Northern Hemisphere landmass, a minor supercontinent called Laurussia or Euramerica. We can say that the North America, Greenland and the north-western part of Russia were one territory. Here you can find many fossils of armoured prehistoric fish, as well as their teeth. A lot of paleo tourists from different countries come here in search of placoderms. We have a friend-professor of geology at the University of St. Petersburg. He said that last year a student from Japan went home with a necklace from the teeth of a armoured prehistoric fish. It was a very big paleontological luck. Next to the sand quarry are special designs for sifting sand. Large parts go in one direction, and fine sand in another. On photo few pieces of the shell of the fish (Asterolepis), which we found in 1 hour, and rock layers in sandy quarry. (Asterolepis is an extinct genus of antiarch placoderms from the Devonian of North and South America and Europe. They were heavily armored flat-headed benthic detritivores with distinctive jointed limb-like pectoral fins and hollow spine. The armor plate gives the Asterolepis a box-like shape. Its pectoral fins are also armored but the caudal and dorsal fin are not. The first fossils were named after M. Eichwald in 1840 after not star-like markings on the fossils.)
  14. Went out to Iowa for a Devonian hunt. Found a few placoderm teeth and what I'm told is a Dunkleosteus jaw/tooth bit. I'm happy. Can't wait to go back this Fall. I also found some nice crystals, pyrite and partial trilobites. Placoderm material Anyone know what this is from? My best guess is possible shark tooth.....? Dunkleosteus bit (it needs some prep and reconstruction)
  15. Ohioan Placoderms?

    I have heard about placoderms being uncovered from the Devonian of Ohio, but am unable to find any references to specific placoderm fossil specimens and where they are in Ohio. Can someone please shed some light for me on the subject? (I'm looking for ones just from the Ohio area ) I consider placoderms awesome! Thanks a ton!
  16. Concretion? Placoderm?

    My friend found this big concretion like fossil in Quqing, Yunnan of China. Something on the surface looks like a placoderm to me, what do you think?
  17. Today I went to the "Belgian institute of natural history" to donate my placoderm that I found in Oktober. It is verry likely that it is a new species , but only time will tel. The local placoderm specialist wil work on this specimen for the description. Here is the link to te 1st thread on this topic:
  18. huge placoderm

    I often visit the southern part of Belgium for Devonian fossils, the whole area is known for its reef systems. So most of the fossils are brachiopods and corals, but between the reefs sometimes rarer fossils can be found like cephalopods or in extremely rare cases even fish. In more than 25 years of fossil collecting I’ve only found 2 fragments of Devonian fish until last October. During a field trip I searched a few debris next to a quarry and found a strange piece of rock. At first I almost discarded it thinking that it was a strange nodule, surely a piece of this size couldn’t be bone. But I took time to clean of the dirt… I had in my hands a rock with a bone plate, the thing was huge, more than 20 cm on 25 cm, and it was only a fragment. I had never seen something like that from the late Devonian in our area. I started franticly to search the rest of the area, finding more and more fragments. Some parts were even larger and the plates were often more than 1 cm thick, on some places even more than 4 cm. This fish was a monster, I knew this was my find of a lifetime. The rest of the day I spend on the same 2 m² checking every rock. I finally found 14 fragments of the fish. At home I cleaned up all the fragments, I even had a few parts that fitted together, but I couldn’t make anything out of it except that it were large bone fragments. It was also clear that I only got a tiny part of it. In the week to follow I contacted a specialist in placoderms from the Institute in Brussels. Exited by the news he came to check out the fossils at my apartment on a evening. He confirmed that this was indeed a placoderm, and a huge one, even he had never seen one of this size from the late Devonian in Belgium. One of the parts turned out to be a fragment of the median dorsal plate, the typical keel from that part of the fish was clearly visible. One of the drawbacks of the fossil was the complete absence of any ornamentation or tubercles on the bones, this would make the identification difficult. But the size of the specimen limited the options in 3 groups: Either a new extremely large coccosteidea. ( in my opinion the least possible match) Or either a Dynichthydea or a Tytanichthydea. Either way, any of those possibilities are extremely spectacular J Of course on the weekend to follow I had to go back to check out if there was anything I overlooked. Armed with adequate equipment to dig, I started to dig out the spot with my girlfriend. The result was an extra 10 fragments, again with a few of them being very large. And on top of it lots of the new fragments fitted in the ones I found the week before. Since then I’ve been cleaning and prepping a little on the bones and kept contact with the placoderm specialist. Having contemplated what to do with it, I will donate the fossil to the institute next week so that professional work and a proper description of the placoderm can be made. Of course I will post an update of this in the “paleopartners section” I really hope this is a new species, but either way I had fun with this discovery, and there is still much to find out about my “little” fish
  19. Australian Placoderm

    G'day, We recently found this partial placoderm skull at a property near Wee Jasper, NSW and I'm wondering what part of the skull it is. We found a lot of other stuff on that trip too, and I'll do a trip report on that eventually. Thanks, Izak
  20. Deb and me just got in from a good six hour search for Greenops, carving out and extending benches. Did we find full ones? Well, yes and no. As those familiar with the area know all too well, finding a full Greenops is not easy. Apart from a zillion moulted pieces, their notorious delicate flakiness, and sometimes the frustration with the matrix itself, full ones - when they appear - rarely come out nice and pristine without some damage. I haven't been as much of a Greenops whisperer this year, but some pics of finds... First up are the heartbreakers - stuff that had the potential to be full, but for one reason or another wasn't. Next is a cluster of more heartbreakers, but there are two "full" ones in there, but with considerable damage on one and distortion on the other. The others in that group may prep out full, but they already display considerable damage. I don't usually find crinoid stems this far up in the Widder shale. This stem actually continues on the other side. Some very delicate prep, and I'm hoping I might find a surprise at the end of that stem. My rule about this orthocone nautiloids is, if it is intact, wrap it up and put it in the bucket. This might actually come free of the matrix.
  21. Placoderm?

    Well, without going into a lengthy explanation, yes, I found this in the Arkansas River about 3 feet under the bottom rocks and what we call the NTS (Nasty Toxic ..., unfortunately my rock hound playground is also a delisted superfund site). It took months to finally get it to where it's at now. About half a year in fact of fervent brushing and gentle filing with a diamond coated pen file. Acid has also played a major role but I'm at the point now where I can't risk using more lest I melt what I'm trying to reveal. Is there any readily available household remedy I can use as a protectant of sorts that I could apply on the delicate fossil material so that I can submerge this thing back into acid? Also, would Thyiglycolic acid benefit me here in this scenario? Thanks ~Noah Benzing https://www.youtube.com/watch?v=tn1uSydlkzQ Here is a view of the underside.... I'm getting close to revealing the actual teeth (although I have unfortunately destroyed one or two so far).
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