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Found 18 results

  1. This piece is supposedly a horseshoe crab ( Mesolimulus walchii) from the Solnhofen limestone of Germany. It is Jurassic and the description says there has only been mild color enhancement. Is this fossil real? Any fabrication? Thanks for the answers!
  2. I recently stumbled upon this informative gem of an html article discussing modern trilobite lookalikes. Being a trilobite-cephalon myself, I found it fascinating, so I wanted to share it with you all! The article: Trilobite imposters
  3. Photographed this is a river bed near Methven, New Zealand. Approx 28 cm in length. My first impression is overlapping horseshoe crabs.
  4. Perfectly preserved 310-million-year-old fossilized brain found By Harry Baker, Live Science, July 28, 2021 Bicknell, R.D., Ortega-Hernández, J., Edgecombe, G.D., Gaines, R.R. and Paterson, J.R., 2021. Central nervous system of a 310-my-old horseshoe crab: Expanding the taphonomic window for nervous system preservation. Geology. Open access Yours, Paul H.
  5. I wanted to share some horseshoe crab tracks I found at the Stephen C. Minkin Paleozoic Footprint Site in Alabama (Union Chapel Mine) in Alabama this past year. Here is some info about the site: http://www.encyclopediaofalabama.org/article/h-1371 I found the positive side also, but it is broken. I plan to hang this part on my wall eventually.
  6. Last weekend, we went back to a site we had discovered about 10 years ago, along Highway 260 east of Payson, Arizona. The Naco is pretty much all pure carbonate limestone, grey in color and in many places loaded with crinoidal material. But when we discovered this site on satellite photo images, we knew it might be very different. What appeared to be very fine laminar layers in a small outcrop on a side road appeared in the photos. It turned out when we finally went there with our 4WD vehicle, it was a very finely laminated mudstone, with a high terriginous content. (read: dirt from the nearby land). Nothing was at first found, not even one fossil. But then we discovered certain layers contained very small finely detailed trace fossils. They were tracks and undertracks of Kauphichnium - the trace fossils left by Limulids. (Horseshoe Crabs). There is no other site we have ever found in the Naco with such fossils, and we have traveled over hundreds of miles of exploration in both Northern Arizona and Southern Arizona in the Naco formation. This site is unique. After a hiatus of 10 years, it was time to go back and get some better photos of this site and using our new Sigma 150mm macro lens (what a sweet lens!) obtain better shots of the trace fossils. Since our first trips, the road had extensive road construction, and the side road was now completely blocked off by a guard rail. Now where to park. We parked about a quarter mile down the road on a side road, and walked to the locality. It is on the back of a ridge, and cannot be seen from the roadway. When we finally got to the site, it was smaller than I had remembered! Gee, it seemed to be so big last time. The shales were right there, a beautiful yellow green color, nothing like any other Naco site. But we were surrounded on all sides by crinoidal limestones typical of the formation. When the sun is out you can split the shales, and when you find the right layers - holding the slabs at a steep angle to the sun allowed us to see the most common trace here, the Limulid underprints. Let me explain a bit what an underprint actually is. When an animal prances through the mud on the surface of a hardground, it leaves the foot and toe impressions, and in the layers just under the prints, you get compression of the muds. This change in density is retained in the fossils when the mud lithifies and turns to mudstone. When the shale is split, you can have several thin layers of shale just below the actual prints with what appears to be dents or slot shaped marks. Those are the underprints. We of course also find the actual surface tracks as well, Kauphichnium is a Y shaped or forked print. These horseshoe crabs were small, dime to quarter sized. After a few hours of splitting shales and finding some trackways with telson and carapace drags as well, we left once again, hoping to return soon and spend more time at this unique site in search of its trackway treasures! Below are some photos of the expedition and some of the material found. Please visit our much more extensive write up on our web page for more images and details! It can be found here: http://www.schursastrophotography.com/paleo/NacoCrabTrax062020.html Photos: Here is the locality as we approached on the side road. the Outcrop is on the left. The Outcrop. The thin shales here are precious - and unlike much of the Naco in the surrounding area. It is an island of different material from a shallower water deposit with sedimentary structures. and wave ripples. Montage of Kauphichnium found at site, close ups with the new lens. small slab in positive hypo relief of both undertracks and actual prints. Another slab in negative epirelief, of the slot shaped undertracks. This is part of a trackway sequence. Finally, a Limulid roadway. On the left is a long series of tracks with a teleson drag, and with other underprints on the right. The round prints on the right edge are also Kauphichnium, representing the tips of the toes so to speak piercing the sediment. Once again, I encourage you to visit our web site and read more on this exciting site: http://www.schursastrophotography.com/paleo/NacoCrabTrax062020.html Thanks for looking, Chris
  7. Just joint and wanted to get my first entry in. This middle Pennsylvanian concretion from Mazon Creek, was discovered in 2015 in pit 2, in an area I call Ivy Ridge thanks to all the Poison Ivy in the area. The finger near the top right should be where the shark emerged. I did not find this shark egg case variety posted. I hope this helps in future identification. Eventually I will be getting the measurement blocks. Shark Egg Case Phylum: Chordata Class: Chondrichthyes Palaeoxyris multiplicatum Horseshoe crab Phylum: Arthopoda Superclass: Chelicerata Class: Merostomata Order: Xiphosura Euproops danae
  8. There are currently 3 recognized species of horseshoe crab known from the Mazon Creek deposit. Of these 3, Liomesaspis is the rarest. They are only known from the Braidwood (non marine) portion of the deposit. The most defining feature is the bulbous cardiac lobe. The few specimens that I have seen are often poorly preserved.
  9. I don't agree with the title, but the fossil is cool, a renamed and reclassified horseshoe crab from Tasmania. https://m.phys.org/news/2019-10-oddness-australian-creatures.html
  10. Good evening folks, I'm new here but was hoping someone could help me identify my find. Firstly I'll be honest and say I'm not even sure this is a fossil. I found it this evening on a beach walk. So it was found on Skegness beach, this is on the east coast of England at the northern end of the Wash, a bay on the North Sea. Skegness beach is mostly sand with a few pebbles and rocks. There are usually very few fossils on the beach and it's not an area known for it's fossils. Over the opposite side of the wash is the Norfolk coastline, this is mostly made up of cliffs with chalk, sandstone and flint I think, but there are more fossils in this area and some small material from the Norfolk coast does make it's way over the 15 to 20 miles and wash up on Skegness beach. This find (if it is a find) is unlike anything I've seen on Skegness beach before and is nothing like any other rocks, stones and pebbles in the area. My first thought was it way be a horseshoe crab fossil, but a quick check on here has me thinking this is not the case. My partner has suggested a small tortoise or turtle and it certainly has that type of shape to it, I'm not sure that the photo (I only seem to be able to add one photo) truly shows the shape but it's the best I can get. The photo is of what I would describe as the underside. Any help with identification is greatly appreciated, or advice on how to add further photos (sorry I'm really not a tech wizard) Thank you in advance for any help.
  11. ntrusc

    Belinurus

    From the album: Carboniferous animals

    Belinurus with preserved legs from the coal measures of the uk.
  12. ntrusc

    Belinurus with legs preserve. Uk

    From the album: Carboniferous animals

    Belinurus horseshoe crab from the coal measures of the uk.
  13. The horseshoe crab Mesolimulus walchi is reasonably common within the Solnhofen limestones. Ventral preservation. Lit.: Stunning Discovery: World’s Longest Fossilized ‘Death Track’
  14. Lit.: MOORE, R., McKENZIE, S. and LIEBERMAN, B. (2007): A CARBONIFEROUS SYNZIPHOSURINE (XIPHOSURA) FROM THE BEAR GULCH LIMESTONE, MONTANA, USA. Palaeontology, Vol. 50, Part 4, 2007, pp. 1013–1019. Schram, F. (1979): Limulines of the Mississippian Bear Gulch limestone of central Montana, USA. Transactions of the San Diego Society of Natural History 19:67-74 (1979)
  15. References: Selden, P. & Siveter, D. 1987: The origin of limuloids. Lethaia, Vol. 20, pp. 383-392, Oslo.
  16. References: E R Eller (1936): A review of the xiphosuran genus Bellinurus with the description of a new species, B Alleganyensis. Annals of the Carnegie Museum, v. 27, art. 8. Selden, P. & Siveter, D. 1987: The origin of limuloids. Lethaia, Vol. 20, pp. 383-392, Oslo.
  17. Clay stone layer above the ‘Zweibänke’ coal seam. Steinbruch Piesberg is a sandstone quarry. The quarry itself has been active since the middle of the 19th century, but the mining activities at this location date from as early as 1461. The area was first mined for coal. Piesberg is one of the very few outcrops in Northern Germany where you can dig Carboniferous layers. The quarry itself is famous for its plant fossils from the Carboniferous period, but you can also find remains of dragonflies, roaches, arachnids, arthropleuridae, scorpions and of course horseshoe crabs. Freshwater shells also occur, but they are rare. References: P. Siegfried. Ein Schwertschwanz aus dem Oberkarbon von Ibbenbüren / Westf., Paläontologische Zeitschrift, Vol. 46, Nr. 3-4 (1972), p. 180-185
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