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Found 31 results

  1. Coprolite or pseudofossil ?

    Hi everyone, This is just another piece of something that I cannot identify, found at Yaxley, Cambridgeshire, UK, three days ago. My first guess is a cropolite fossil but I'm more convinced that this is just a piece of random rock. Yaxely Lake is very rich in Jurassic fossils buried in the Oxford Clay found there. I managed to find a lot of belemnites and ammonites but this isn't one of them. Any help you could offer would be greatly appreciated. Thanks, Bong
  2. Belemnite

    Hi everyone, Attached are pictures of three small fragments of belemnites I found three days ago in Yaxley, Cambridgeshire, UK. In the first picture, two of the belemnites are what I usually find in the lake but one of them looks significantly different. It looks like it is coated in thick white stuff (which I cant identify) which almost makes me believe this may not even be a belemnite fossil. Can anybody tell me what this is please? Is this even belemnite? Thanks, Bong
  3. Hello all, Currently digging through boxes I haven't looked through for several years and came across these two ammonites. I thought they were Kosmoceras grossourvrei but they seem to be too coarsely ribbed, Kosmoceras pollucinum maybe? Any help or advice with this would be greatly appreciated. Found in the Lower Oxford Clay of Kings dyke, Cambridgeshire. Callovian stage. Cheers, Jacob.
  4. Hello all, As part of my dissertation I have been sifting for micro-fossils using Braiser's (1980) white spirt method. The samples have yielded a range of micro-fossils, most of which I have been able to identify. However, this has stumped me. I believe it to be a tooth/toothplate from a fish, the enamel texture is similar to tooth textures I have seen before, though I cannot identify the species or if it is one. Any help or advice with this would be greatly appreciated! Cheers, Jacob.
  5. Hello, If you have seen my prior posts, it would appear I'm on a lucky streak... I found the blade of this sharks tooth at the fleet, Weymouth It is from the middle Oxford Clay (Upper callovian) - specifically the Q. Lamberti/ C. scarburgense subzone bondary I believe it is Sphenodus longidens, though it is hard to tell without the root! Any help or thoughts would be much appreciated Cheers, Jacob.
  6. Pre-apologies for the picture, it is rather small and doesn't pick up well on my camera... Nonetheless, can anyone help identify this tooth? I have the name on the tip of my tongue, but my books are not with me to help identify it...
  7. Hello, I am looking for help identifying a specimen collected during field work for my dissertation. The piece was collected from the Lower Oxford Clay (jason zone) in Peterborough, Cambs. I suspect that it is Ischyodus egertoni, but am not positive whatsoever! Any thoughts would be appreciated Cheers, Jacob.
  8. Collected from the K. jason subzone within the Lower Oxford Clay of Peterborough. I thought it could potentially be a palm leaf due to the veins, though wood is prolific - a leaf would be atypical of marine deposits? GBP 1 pence piece for size reference Any help would be much appreciated. Jacob.
  9. As I was putting together labels with photos containing microscopic images of inclusions in coprolites, I came across something that I may have misidentified as a fish tail and vertebrae in a very small coprolite. After looking at it again, the tail looks more like a shrimp or crawfish tail than that of a fish. What I thought were fish vertebrae, look more like crustacean arm joints/elements. Can anyone please confirm this for me? Thanks a bunch! Formation: Oxford Clay (Jurassic - Callovian) Location: Orton Pit, near Peterborough, Cambridgeshire, England
  10. Oxford clay puzzles

    I really feel like I should recognise these, but just don't. I wondered if one was a bivalve shell, but it's unlike any I have found, and the other perhaps an impression of an ammonite. Any help appreciated. Jurassic, Oxford Clay, Peterborough member. @DE&i
  11. Metriorhynchid tooth

    From the album Dinosaurs and Reptiles

    Rooted marine croc tooth from Jurassic
  12. Jurassic fish

    This is my most complete fish, and I found it last year. I went fossiling yesterday and found more fish bits, so hopefully it's a good layer of clay for fish. I thought understanding this one might help me with the individual pieces. More experienced people than me pointed out it's probably a skull, and there are vertebrae at one end (right hand side of first image). But I've been looking at fish skulls and I'm still confused. It looks like a snout at one end, which seems wrong. Is this distorted? I thought it might be Aspidorhynchus as that had a long rostrum, but I think it's more likely to be a leptolepis as they are more common. It could just be I dont understand the skull. Any pointers would be appreciated. Jurassic, from the Oxford Clay, Peterborough formation.
  13. This post will be ongoing as I am still processing my Oxford Clay and started looking at microfossils in it in 2009, I think. Hoping to start photographing finds very soon. See finds already donated to museum in Partners in Palaeontology - Contributions to Science. 1- Agglutinated foram 2 - Also Agglutinated foram according to museum, weird. Would like to find another photo to confirm. I think I need an Jurassic atlas on the things. Santa take note. Yes I will work out how to stack my microscope photos one day.
  14. Yaxley Fossils

    I went to Yaxley today, and after processing most of my finds I'm left with a few puzzles. I recently found an echinoid spine, and was wondering whether the first one below is part of an echinoid test, The second was picked up as a belemnite, but the cross section looks wrong, and I've seen echinoid spines in museums of a similar shape. The third bobbly one I have no clue, and would be grateful for any suggestions. I've called it Mr Bobbly. Finds are from Yaxley, UK, Jurassic, Lower Oxford Clay, Callovian. ETA: the order of the photos changed as I posted, the first fossil is the round black one in the images, the second is the very pale belemnite-like one, including cross sections, and the third is the long bobbly one.
  15. Strange mark in clay

    I found some great stuff yesterday, but I'm stumped with this one. It is a two dimensional stain in the clay, there are three pieces of it, and I think it is perhaps a burrow, or a trace fossil of some kind. I've seen things I thought were burrows before, but they didn't look like this, so perhaps I was wrong in those instances? Or a different type of burrow. It's a very dark circular mark in the clay. The images without a scale are taken with my microscope camera. ETA Forgot the important bit! Oxford Clay, Peterborough Member, lower Jurassic. They've put new clay in the fossil hunting area, and I'm unsure which layer this is.
  16. Suggestively shaped rock

    I picked this up a year ago as it is convex on both sides and looks a bit like a vertebra. It's from the Jurassic Callovian Lower Oxford Clay at Yaxley, and a year on I still can't decide if it's just a suggestively shaped rock or a very worn vertebra. It's really hard to show the convex shape in the photos. ETA: I meant concave, not convex
  17. Hi, @oxford clay keith @DE&i and anyone with any thoughts on the matter I go to two sites, within a few miles of each other, with exposures of the Oxford Clay. I've been puzzling at the difference between the biotas I find: Yaxley - Lots and lots of crinoid ossicles, vertebralis and surpula. Also plenty of gryphaea, belemnites and ammonites, the latter three dimensional and pyratised. Basically a lot of benthic critters, with some pelagic. King's dyke - No crinoids. No serpula. Haven't found verterbralis. There is evidence of pyrite, but this is usually a dusting over delicately preserved aragonite shells. There are gryphaea, but the benthic fauna seems less diverse. I'm baffled. I thought one possibility could be that Yaxley represents an oyster reef, glued together with serpula tubes. This would provide a firmer base for animals such as crinoids than the usual soupy mud of this period and location. Oyster reefs exist all over the world today, still exist off the coast of Britain, and there are very rare serpulid reefs off the coast of Scotland. Gryphaea are a form of oyster, and these unlike at King's dyke, are really encrusted with fantastic serpula tubes. I thought perhaps the Yaxley exposure was in the Jurassic slightly closer to a shore and sustaining reefs. There are some other important differences between the sites. Yaxley is an eroding former brick quarry, so relatively static, whereas at King's dyke the clay is supplied and renewed by the brick company from different layers of the Oxford Clay, and put on a site for fossil hunters. The preservation is very different, and in part that will be because the latter is fresh clay, just quarried. I could be as much looking at different layers as different locations. Both sites produce marine reptile fossils. But one seems more pelagic than benthic, the other more benthic than pelagic. Preservation bias could be playing a big role. Delicate fossils would not survive at Yaxley in the same way, leaving mostly heavily mineralised, hard fossils. All thought very welcome.
  18. After splitting some clay shales this morning I wondered how these two fossils would have come together. Thank you for looking
  19. Belemnite species

    Following on from a post in the questions forum, I was trying to identify this species of belemnite that I picked up on Friday from the Oxford Clay at Whittlesey, and learn generally how to identify species myself, rather than squeak 'thunderbolt' excitedly. It struck me as unusual partly because its shape is different from most of the belemnites I see in the Oxford Clay, but also because of the strange white coating. Aragonite is preserved at the site, and I thought perhaps it had aragonite around the calcium carbonate rostrum. Sadly it broke as I extracted it from the clay. It is conical, depressed, very acute and has a deep groove. I was using Fossils of the Oxford Clay to identify it, but although it is most similar to Belemnopsis bessina, I then decided it couldn't be because it is not hastate. But rereading the description it does say it can be weakly hastate, and it might be. Also in favour of this specimen being this species is the flattened apex and kidney shaped transverse section caused by the deep groove. I was possibly overthinking things. It would be reassuring to have other people's input Other features include a strange ridge on the reverse. Not seen that before. Also, just for fun, an 8mm belemnite. I'm not expecting to ever identify it, but it's cute and I thought I'd share.
  20. Hello I found a very distinctive belemnite while fossiling on Friday, and want to learn to identify the species myself, and hopefully identify all of the more complete ones I have collected. I used this resource http://www.bgs.ac.uk/discoveringGeology/time/fossilfocus/Belemnite.html to classify its features, and looked at Fossils of the Oxford Clay by Martill and Hutson to try and find it. Unfortunately only six species are identified and this isn't one of them. I looked in British Mesozoic Fossils from the Natural History Museum, and while this has Jurassic Belemnites, they are too early. Trundling around online hasn't gotten me any further. I'm trying to be more systematic in learning about my fossils, and was wondering how others approached first learning about specific species, and if there are any resources you would recommend? And if anyone knows of a monograph on Oxford Clay belemnites, please let me know
  21. Tiny Tooth and something fishy?

    The tiny tooth is Jurassic, from the Oxford Clay at Whittlesey. I think it's marine reptile from its shape, but not sure which one. The second one I found last year, and I'm baffled by it. I think it might be fish. Any suggestions would be very welcome!
  22. From the album Coprolites

    This is a brief video showing inclusion contained with in a Jurassic marine coprolite thanks to the magic of X-ray computed tomography (aka Micro CT Scan). The coprolite is from the Oxford Clay Formation, Orton Pit, Peterborough, Cambridgeshire, England. Imagery was provided by the University of Minnesota X-ray Computed Tomography Lab.
  23. Coprolite with cephalopod inclusions

    This coprolite is from a marine creature that swam in the Jurassic seas that once covered this parts of England. The dark inclusions that can be seen on the surface are cephalopod hooks. In April 2016, the University of Minnesota X-ray Computed Tomography Lab scanned the specimen using a X5000 high resolution microCT system with a twin head 225 kV x-ray source and a Dexela area detector (3073 x 3889 pixels). Many of the images shown here are of individual 3D elements/features within the coprolite that were separated/isolated using Blob3D. The taxonomic classification given is for the inclusions, not the coprolite. Aside from the hooks, it is hard to definitively identify the inclusions without damage to the coprolite. The following is a list of inclusions: 241 hooks of various sizes that are at least 75% intact. 200+ plate-like fragments of various sizes. 19 ellipsoidal structures, possibly forams or parasite eggs. 2 unidentified long, straight conical structures joined at wide end (A) 1 long rod-like structure with a bulbous end (B) 1 unidentified mass that looks like it was the attachment point for 5 rod-like structures (C) 1 1ong cylindrical (rod) structure that tapers in the center. The center density is much lower than the outer shell (D) 1 irregular structure that looks I originally thought might be an ink sack or buccal mass, but the size is wrong. Experta think it is more likely foraminifera (E) 1 irregular structure, possibly a statolith (F) Acknowledgements: Thank you to Neale Monks and Christian Klug for providing input.
  24. COELENTERATES Class ANTHOZOA Anthozoa are represented in the Oxford Clay by a single species of the ahermatypic coral Trochocyathus. However, when it occurs, it is relatively abundant. The general absence of corals in the Oxford Clay Sea may be a consequence of high sediment input, and possibly reduced light levels. Trochocyathus today is found in waters greater than 30 meters deep. Described: Small, solitary cup coral, outline circular, depressed, slightly conical. Septa prominent on theca. Columella fasiciculate. Remarks: Common in the Middle Oxford Clay, where it rarely reaches more than one centimetre diameter. The description for these corals above is certainly correct as quoted from the most excellent Fossils of the Oxford Clay book. A friend of mine found quite a few of them in 1985. And today gave me a few with a label stating they “Derived from the Middle Oxford Clay, Glacial Drift” It’s the “Glacial Drift” wording that has me confused , would anyone have any suggestions please. @oxford clay keith
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