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Found 52 results

  1. Megaonychites, form genus for the giant hooks that some belemnites have been shown to carry as a pair. By analogy with modern coleoids, they were probably carried by the males and used as mating claspers. This is a fairly large one at 3.4cm (the range is 0.5cm to about 4cm). It most likely belonged to a large Acrocoelites trisulculosus, by far the most common belemnite in these beds. Very rare in the UK but more frequent in the equivalent Holzmaden Posidonienschiefer. I've only seen one other from here - a partial - and that was mine until I gave it away thinking at the time it was a fish bone. (It was a long time ago... ). A recent acquisition from the usual auction site. (Found by a knowledgeable friend so the stratigraphy is good.) Mulgrave Formation ("Jet Rock"), Toarcian Stage, Lower Jurassic, near Whitby, Yorkshire, UK.
  2. Please could anyone suggest what this is? I'm assuming fish, with little (less than 1mm) white spherules that might be teeth or denticles. From the Jet Rock (Mulgrave Shale Member) - a Lower Jurassic, Toarcian shale at least partly deposited in anoxic waters. Near Whitby, Yorkshire, UK. (Acquired in an auction as an extra with another fossil that I really wanted so I'm just curious really, I know little about fish!)
  3. At over 4" across, this is the last few chambers of by far the largest diameter belemnite phragmocone I've ever seen. (If anyone has one from a Megateuthis, I'd love to see it! - they don't seem ever to be preserved.) Given to me by a friend, it is in a nodule from the Jet Rock (Upper Lias, Lower Jurassic) of Port Mulgrave, north Yorkshire coast. It must have belonged to an exceptionally large Acrocoelites trisulculosus which is probably the only belemnite to occur in this bed. It's a large species anyway - typical rostra of it are 5 - 7" long but about 9" has very rarely been recorded so a bit longer may be possible. Photo 6: Not having such a large Acrocoelites in my collection, I've done a conservative mock-up of it with a smallish (9") Megateuthis and another piece of phragmocone which is my second largest... A total length of 20 - 24" seems about right. Photo 7: For comparison , I have a complete but crushed example of A. trisulculosus about 12" long, the rostrum being 6.5". 1) 2) 3) 4) 5) 6) This should probably be stretched more... 7) A normal size Acrocoelites trisulculosus with crushed phragmocone (the strange ridged structure on top of it is a crushed on-edge Harpoceras shell mouth)
  4. Extremely rare, I never thought I'd get the chance to acquire one of these so I was very pleased when one came up for sale. Chitinobelus acifer Fischer 1981, a belemnite (or possibly belemnotheutid) whose rostrum was originally composed of aragonite with organic material. As a result, it's preserved as a compressed organic film with the aragonite lost to diagenesis. Belemnites are nearly always mostly calcite (largely thought to be primary) and preserve 3D in all sorts of rock. There is argument (quite complex) over whether this is an unusual aragonitic belemnite or something a bit different. There are prominent striations which are similar to those in the "normal" belemnite, Salpingoteuthis. From the Jurassic, Lower Toarcian Posidonienschiefer of Zell (not far from Holzmaden, Germany). As far as I know, this is the only locality it's been found. Phragmocone chambers just visible.
  5. Catacoeloceras crassum (Young & Bird 1828)

    From the album Cephalopods Worldwide

    2cm. From the early Jurassic Toarcian bifrons zone at Ravenscar, Yorkshire, GB.
  6. From the album Cephalopods Worldwide

    4cm. Pyritized shell. From the early Toarcian bifrons zone at Ravenscar, Yorkshire, GB.
  7. From the album Cephalopods Worldwide

    4cm. Found in a concretion at Ravenscar, Yorkshire, GB. Early Toarcian bifrons zone.
  8. Toarctocera subpunctata

    Pyritized
  9. Costatrochus subduplicatus

    Shell preservation
  10. Another bivalve steinkern from France

    Hi all, Anyone know what species/genus this gastropod is? Never seen anything like this one before... It's from Rivière-sur-Tarn, a location in France that yields fossils from the Toarcian stage of the early Jurassic (approx 180 mya). Best regards, Max
  11. Bivalve steinkern from France

    Hi all, Anyone know what species/genus this bivalve steinkern is? It's from Rivière-sur-Tarn, a location in France that yields fossils from the Toarcian stage of the early Jurassic (approx 180 mya). Best regards, Max
  12. Gastropod from France

    Hi all, Anyone know what species/genus this gastropod is? It's from Rivière-sur-Tarn, a location in France that yields fossils from the Toarcian stage of the early Jurassic (approx 180 mya). Best regards, Max
  13. Steneosaurus sp. (St.Hilaire 1825)

    From the album Vertebrates (other than fish)

    11 mm. long tooth. Missing the point again Recieved on a trade for prep with Sebastian (belemniten). From the slate quarry Kromer in Oehmden near Holzmaden. Early Jurassic, early Toarcian Posidonienschiefer, "Schlacken".
  14. Saurorhynchus acutus (Agassiz, 1844) rostropremaxilla. Lower Jurassic, Mulgrave Shale Member (bed 42), Falciferum Subzone. Near Whitby, Yorkshire. I spotted this little fish rostrum when I was looking for belemnites a couple of weeks ago. It was about to flake off the outcrop and I hadn't found anything else interesting so I brought it home as a consolation prize. After some research, it seems it's very rare here. The only recorded specimens I can find are a few (5?) 19th century ones, including the holotype which is also just a jaw. Other workers at the time (Tate & Blake) doubted their Yorkshire provenance, assuming them to have been from the Dorset Lower Lias, sold by dealers - a similar species is quite well known from there. Here's a very recent paper: Saurorhynchus revision. It is a lot more common in Germany, with more complete material. I prepped its hidden teeth today - 5 hours with a scalpel under a x20 binocular microscope. I think an air abrader would have blown them away. As found:
  15. Cenoceras cirji (Rulleau 2008)

    A small specimen with most of the body chamber intact.
  16. Cenoceras jourdani (Dumortier 1874)

    Calcified steinkern. Phragmocone plus a bit of the body chamber.
  17. Lytoceras siemensi (Denckman 1887)

    Calcitized phragmocone.
  18. Calcite mold with partial shell preservation.
  19. Calcite mold with a bit of shell in a concretion.
  20. Pyritized phragmocone.
  21. Pyritized phragmocone.
  22. Pleydellia cf. leura (Buckman 1890)

    Pyritized phragmocone.
  23. Cotteswoldia aalensis (Zieten 1832)

    Pyritized Phragmocone.
  24. Pyritized phragmocone.
  25. Complete pyritized shell.
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