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Found 21 results

  1. 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
  2. Metriorhynchid tooth

    From the album Dinosaurs and Reptiles

    Rooted marine croc tooth from Jurassic
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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
  8. 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.
  9. After splitting some clay shales this morning I wondered how these two fossils would have come together. Thank you for looking
  10. 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.
  11. 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
  12. 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!
  13. 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.
  14. 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.
  15. 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
  16. I had this little coprolite from the Oxford Clay, Orton Pit, Peterborough, Cambridgeshire, England, scanned by the University of Minnesota X-ray Tomography Lab. Some cephalopod hooks were visible on the surface under magnification. I was amazed by the number of hooks that were revealed by the micro CT scan. Here is what was visible on the surface:
  17. Oxford clay ammonite help

    I recently found this ammonite and have no clue as to what the species is, ive asked a local expert and he's never seen one like it allegedly. Found in the peterborough, UK.
  18. Pliosaur Metacarpal?

    Hi All, this recent find from clay in Cambridgeshire... Darren suggests a Pliosaur metacarpal (flipper bone)
  19. At last the Ketton Quarry field trip has arrived it’s just after 8.00am UK time the dig starts at 10.00am with a half an hour drive to the quarry I’ll be setting of at 9.00am. The weather forecast is overcast all day with light rain about 1.00pm the dig finishes at 4.30pm so I’m guessing we should be ok. Let me tell you this is a HUGE quarry with miles of opportunities for collecting fossils in many different beds, everything from the Iolite series to Oxford Clay. Gypsum is also quite common here. Ketton Quarry also contains one of the most fascinating faults of its kind in the UK and is likely to soon have SSSI status. Ketton Quarry is too big to completely cover in one trip; it is several miles wide and is still growing. The best area to search in is the Blisworth Limestone, part of the Oolite series. Both the Great and Inferior Oolite is present at Ketton Quarry. Ammonites can be found, but shells, corals, echinoids and micro fossils such as sharks teeth and bones are more common. Dinosaur footprints are also quite common along with fragments of bone. Geology: the Great and Inferior Oolite makes up the bulk of the beds at the quarry. The exact name of the limestone is the Blisworth Limestone. At the top of the beds is the Blisworth Clay. I’ll be posting to my Out In The Field link upon arrival and then later to the TFF so stay tuned if you’re up and about should be a good day. Darren
  20. Microfossil Id

    Hello, As I am sorting through my Oxford clay micro fossil material, there are a bunch of seemingly related items that I have not been able to ID. I have included pictures of two pieces that I think are different parts of the same type of specimen. Most of the pieces I have found are straight or slightly curved sections of roughly square cross section (spec 1) with a circular interior that sometimes bloom out into the odd lumps you see in the other picture (spec 2). I am assuming its something quite common and silly as I have found dozens of them, but I just have not been able to ID them yet. They are in the roughly 1mm size range and come from pre-seived Oxford clay Jurassic period:
  21. Mystery Microfossil

    Hello! After recently venturing into the wonderful world of micro fossils, I have found a few items I have no idea what they are. Included below is four pictures of one such item, found in pre-seived (to 1mm) sample of Oxford Clay (Jurassic). The item is very 3D and the fluted design on the indent on one side are particulary smooth and stunning under the microscope (which is not done justice in the pictures). The pictures show both sides, and some of them are taken on top of the date on a penny for scale. Also, any decent resources for microfossil identification? I havent been able to find much online. Thanks in advance for any help!
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