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  1. Aussieopal

    Opalised bone?

    Hi all the imaginative one back again This time I am curious as to wether this could be a fossil replacement opal? The photos are not very good because it is quiet small, possibly about the size of a pea. The play of colour in this little thing is absolutely amazing! Every single colour on the spectrum from common blues and greens to beautiful orange, red and yellow. It was found in lightning ridge Australia in a $5 lucky dip bag my kids got. To me it looks like a piece of spine or tail bone but once again i love to imagine!
  2. This came in a parcel of opal from Lightning Ridge. I have cut the bottom and a little of the side to be able to see inside better. The smaller opalized top portion is 8x10mm, the bottom opalized portion is 12x10mm. I have been told this may be a yabby button, however I’m not sure because all the photos I’ve seen of yabby buttons don’t look a whole lot like this. I appreciate any feedback, and feel free to ask any questions:) thanks!
  3. Hey everybody. Ive ran into some opalized belemnites that I bought about 25 years ago. I don't know what kind of lighting is best to show the colors of them? I did a google search and got everything under the sun except for what I was looking for. Any help/ideas would be greatly appreciated. Thanks so much RB
  4. Vopros

    Minerals or fossils

    Hello, Here are a few microscopic images of Yowah opal. I wonder if this spider-looking thing is a fossil or a mineral, and also what do you think about other things in this opal
  5. This is from an email exchange between Dr. Elizabeth T. Smith (of Lightning Ridge and author of the singular "Black Opal Fossils of Lightning Ridge") and I, last month. [Liz also co-authored "Ornithopod diversity in the Griman Creek Formation (Cenomanian), New South Wales, Australia" which was first published in Peer J magazine and which established the new species of herbivore, Weewarasaurus pobeni.] "To explain, it's 0345 and I have insomnia intensified by my excitement about an opalised Lungfish plate I bought today from a top bloke mining at Emu Field (Coocoran), and a little
  6. Woogie

    Tiny opal fossil

    Hello hello, recently i bought some opal, in amongst the small stones was this. I am wondering if this is a fragment of bone? Maybe a piece of jaw bone? Its from Coober Pedy, which i believe is cretaceous and marine
  7. Bugabob

    Opal filled bone (?)

    Here’s a different kind of possible opal fossil from Australia. This was found in Winton, not lightning ridge. See the next post for the story behind it. I hope the opal fossil collectors and experts on here will weigh in with their opinions.
  8. Australian Paleontology

    Help with Ammonite fossil from Madagascar!

    Hello, I really need some help identifying what formation my Ammonite fossil is from. Its been dated to the Albian epoch and is from the Mahajanga province, Madagascar. Unfortunately nothing about it says what formation it could be from. I've done a bit of research and the closest formation to what I'm trying to find is the Ankarafantsika Formation. The problem is that, that formation is dated to the Cenomanian. Any help would be great! Here's a picture
  9. Folks on mindat.com suggested asking this question here! This is less of a "what is this a fossil of" question and more of a "is this possible" question. I have a small chip of translucent chalcedony showing a mass of white inclusions, two of which look very much like a grass seed-head. The gist of the conversation so far has been 'is it possible for fossil material to be an inclusion within a silica mineral like agate or chalcedony?' As opposed to an agate-replacement or opal-replacement fossil like an agate limb cast, agatized wood or agatized/jasperized opaque mudstone with intact fos
  10. goldsmacker

    Opalised Dino Tooth? Pic Heavy

    Hello everyone I have recently obtained an opal parcel of rough to cut into gems from the opal fields at lightning ridge Australia, however right before I was about to grind this one rough opal something stood out. I remembered walking in the natural history museum in Sidney Australia and noticed the opalized teeth of varies animals/dinos etc. This one was just like one I had seen many years ago. I cleaned it only; no polish just water and a soft paintbrush as not to alter it. From my research, I found a possible match a Hypsilophodon it lived in the area where lightning ridge opals are fo
  11. Hello. I have opalized wood for trading. Age - Paleogene. There are Teredo mollusc passages ranging in size from 6 to 10 mm, filled with cemented opal sand, less often with chalcedony. Insect coprolites are also found. There is a sample of a solid section with annual rings (ground, but not polished). If you are interested in such samples, please do not hesitate and contact us in a personal. Have a nice day.
  12. Terry H

    Nevada tree trunk/plant?

    Trying to find out what this is. Found in the Northern Nevada desert. It looks like a round tree trunk 10 inches across. Half of the outer surface is somewhat smooth and the other half has a stepped pattern that reminds me of how some plants grow stems upwards. The pic that shows this section maybe upside down. The photographer and I aren't sure whats up or down. The texture is like glass, we think its opalized? Very sharp edges and smooth. It's brittle. The color is brown on outside with white calcium patches. Inner area is a solid carmel color with tint of green, there are no flashes of rain
  13. Australian Paleontology

    Partial Opalised Dinosaur Jaw Frag???

    So i happen to come across this image, and it claims to be an opalised dinosaur jaw fragment from SA (South Australia) for me at least i do see some kind of fossil but its identification as carinal is dubious in my opion. What do yall think?
  14. Apophis


    Howdy folks, Last weekend I returned to a place in Texas that I have collected marine fossils at previously. The owners of this area have specifically asked that I not share any details on the location, but it’s a bit of an anomaly as it appears to have a number of fossil bearing matrix including sandstone, shale, limestone, and the thickest mud I’ve ever seen. It doesn’t match any of the USGS data either. I found a number of things there that I would like to preset, but the main one is this: The little plates that make up this stone form a spiral a
  15. Scylla

    Six Amazing Dinosaur Fossils

    None of these finds is new, but it is a good excuse to relive six amazing dinosaur finds: https://newatlas.com/science/incredible-dinosaur-fossils/
  16. Potch Picker


    Hello! If anyone could help me out with this it would be appreciated. This opal replacement fossil was mined in New South Wales, about 6 years ago. I found it in a parcel of Lightning Ridge rough and have been trying to identify it for a while now. The closest I have come to a positive match (Still not a match but it's close) is the Molar of a giant Marsupial from the order Diprotodontia. There is a wee problem with this, I've read Lightning Ridge Opal is supposed to be from the Cretaceous and Jurassic periods, a minimum of 66 million years old. The Diprotodontia existed throughout most
  17. ziggycardon

    Opal bivalve ID requested

    Hi everyone, I have this opal bivalve for around a year now I think, but I didn't really bother to look for an ID before. But I recently ordered an opal belemnite so I am thinking on making some new ID cards and I would like to make one for this bivalve as well The bivalve was found in the Bulldog Formation,Coober Pedy, Australia (Early Cretaceous, 135 mya) I am not sure if the photo's are clear enough, but it is the typical bivalve you see often from Coober Pedy, just can't find anything on them. Thank you in advance!
  18. Building a home for dinosaur fossils with extra opal bling at Lightning Ridge By Sally Bryant, Australian Broadcasting, https://www.abc.net.au/news/rural/2015-02-03/dinosaur-fosssils-with-opal-bling-at-lightning-ridge/6065346 A couple of papers are: Meakin, S., 2011. Geodiversity of the Lightning Ridge area and implications for geotourism. In Proceedings of the Linnean Society of New South Wales (Vol. 132, p. 71). https://www.academia.edu/24823750/Geodiversity_of_the_Lightning_Ridge_Area_and_Implications_for_Geotourism Watkins, J
  19. dinosaur man

    Theropod from Australia?

    Hi I found this online and am wondering if its a tooth?, or just a piece of opal. Its 2mm, and is from Lightning Ridge Australia. Thanks!!
  20. kingcobb

    Opal ammonite?

    Picked this beauty up at a local pawn shop over the weekend. I have no experience with opalized fossils, but it looks to be an opal ammonite to me?
  21. Dracarys

    Opalized Vertebra?

    New possible acquisition but need more info. This was obtained in a trade and originally from Lightning Ridge Australia. It was claimed to be dinosaur vertebra but who knows? It is still unprepped and has matrix that needs to be removed which will further improve the look. Two piece, one is 1.5 inch and the second is 1 inch. There are sections where it looks like the fossil did not completely opalized. Any thoughts? @Troodon - help? Thank you all.
  22. I saw some beautiful opalised fossils in An Australian museum and I was just wondering if it is possible to acquire one (without huge funds) even if that is not possible it would be nice if anyone has them if they could show themthese at the ones I saw in the museum
  23. Chasing Opal and Fossils in the Australian Outback An ambitious collaboration between scientists and a local mining community seeks to preserve one-of-a-kind opalized fossils. BY Clare Watson, Undark https://undark.org/article/chasing-opal-fossils-australian-outback/ A recent paper is: Bell, P.R., Fanti, F., Hart, L.J., Milan, L.A., Craven, S.J., Brougham, T. and Smith, E., 2019. Revised geology, age, and vertebrate diversity of the dinosaur-bearing Griman Creek Formation (Cenomanian), Lightning Ridge, New South Wales, Australia.
  24. Hi Everybody, I am trying to ID some fossils for my friends from the Royal Peacock Opal MIne. They have these fossils for display only at their gift shop but they are not really sure what they are. These are all miocene age fossils, Humboldt County, Nevada. I think the foot and the teeth are from some kind of small horse. I have no idea about the jaw with the teeth. Picture 1: Articulated foot bones from a horse? Picture 2-4: Jaw section from unknown mammal Picture 5-6: Bovine tooth, horse? Bison? camel? Picture 7: Bovine tooth, horse? hors
  25. fireagateJim

    Opalized gastropod?

    I've seen a lot of opalized fossils but none exactly like this so I was wondering if anybody could help me pinpoint exactly what it is and if it holds any value? The specimen is roughly 25 mm, semi translucent and has a fair amount of color.
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