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Found 17 results

  1. Today, as I was unpacking some boxed up fossils, I noticed one of the Peripristis teeth I had collected last year looked a bit different. I then compared it to some of the photos I had taken and uploaded of it back in September when I submitted it to the FOTM contest. The tooth has definitely changed some color. When I prepped out the tooth, it had a much more vibrant white/ blue coloration to the tooth, especially toward the tip of the crown. My question is what causes this? Does oxidation change the color over time? Im not too knowledgeable with teeth, and I haven't observed this with other teeth I've collected before. September- Now- As found- before prep showing less red coloration
  2. Found this hastalis shark tooth in a florida creek was just wanting to share, but also wanting to ask whats the biggest lesser great white tooth people have found or personal found. Ive only been fossil hunting for two years but this is my personal best hastalis tooth its about 2.7 inches.
  3. pachy-pleuro-whatnot-odon

    Preservation of colour in fossil shells

    Hi all, Some time ago I found this shell in (what I believe to be) the French Upper Muschelkalk (Triassic). Now I'm not into shells myself, but to judge from the remains of operculum on the underside of it, the specimen concerns an oyster. Most strikingly, however, the shell has a pattern of darker-coloured lines that do not correspond to any three-dimensional/elevational differences on the shell surface - which is, in fact, entirely flat. I haven't seen this on a fossil shell before. Now when doing a Google search for my response on whether it would be possible for crustacean carapaces to retain traces of their original colour, I bumped into an article that described that molluscs may incorporate melanin in the calcite of their shells to create the colour patterns we see (e.g., here). This got me wondering: could the lines I'm seeing indeed be traces of the original melanin pigmentation of this shell? And, if so, how common is this phenomenon? Does anybody else have examples of such shells? I'd also be very happy if someone could furnish me with a genus or species name to go with my specimen. But here I'd like to primarily raise the topic of ancient colour reconstruction in shells.
  4. I was wondering what kind of minerals would make this cephalon from my collection have this color.
  5. Does anyone know of deposits other than the LeGrand crinoids where each species is preserved in a different characteristic color, all on the same slab? We have this kind of thing in the brachiopods and trilobites of the Decorah Formation (Late Ordovician) here in Missouri, which is what got me thinking about it. But I've never seen a report summarizing other cases of this phenomenon, and as I think about it I'm not sure I can name any others. Can you? Brachiopod photo info: A= Zygospira B= Rafinesquina C= Doleroides 1 = Isotelus, rusty brown 2 = ?Achatella, light gray. Highway M near Antonia, Jefferson County Decorah Formation, Late Ordovician, ~450 million years old
  6. I would like to ask if anyone has experience with fossil preparation with the help of heat. My question is triggered by that topic: Authenticating quartz (?) Keichousaurus? - Is It Real? How to Recognize Fossil Fabrications - The Fossil Forum My hypothesis is, that this specimen was baked (as a whole or only superficially, with a blow torch, for example, possibly several times) to promote flaking off of the matrix. Could this be correct? Another question: Some time ago, a baked crinoidal limestone was shown here on TFF (with color turned from a somewhat uniform gray to white-reddish), I can not find the topic again. Anybody else able to find it or able to point to a similar item? Thank you! Franz Bernhard
  7. dolevfab

    Cephalopod Shell Color!

    Hello all! Recently I have been obsessed with cephalopods and realized there is a real lack of reconstructions of the color patterns on extinct nautiloids and ammonites! This led me to compile a list of known fossil color patterns on cephalopods. After a year of on and off research, I found about 90 species of cephalopods retaining official or undescribed, original patterning on their shells. These are the first 15 species on my list. The color markings are based both on descriptions and photographs of the fossil material. The shades of the markings are based on the fossils, but also inferred. I Hope you will appreciate my work!
  8. Hello, I'm looking at this shark tooth for sale, which is listed as Squalicorax bassani from the Phosphate beds of Morocco (scale in cm). I quite trust the seller and as far as I can tell it looks to be the correct species based on a cursory search. However since I am a complete rookie to teeth and have never bought any before, I wanted to ask for a confirmation on the species, and ask how is the quality? Is it good/medium/bad? The other S. bassani teeth I see don't usually have this reddish brown coloration, rather they are ivory/black and shiny, compared to this one appearing rough and grainy. Any idea why that is? Thanks.
  9. Hello, I had a question about the coloration of the beautiful South Dakota ammonites from the Fox Hills formation/Pierre Shale. Namely, many Hoploscaphites/Discoscaphites ammonites have a milky white nacre of the shell, whereas others seem to have a vibrant red/brown sheen. For example here are two photos of Hoploscaphites nicoletti I found demonstrating the two types of colorations: I was wondering what causes the difference in this coloration, and whether one is more rare/valuable than the other? I want a nice South Dakota ammonite for my collection and I'm contemplating options. Thanks!
  10. http://www.sci-news.com/paleontology/dinosaur-carotenoid-coloration-10354.html Non-avian dinosaurs may have had bright color on their skin, scales and beaks in a manner similar to modern birds, according to a paper published in the journal Evolution. http://cdn.sci-news.com/images/2021/12/image_10354-Orange-Dinosaurs.jpg Link to article: Estimating the distribution of carotenoid coloration in skin and integumentary structures of birds and extinct dinosaurs [paywalled, sadly] My Uni does not have access- I'd love to read this one if someone has a copy-
  11. This piece of amber containing an inclusion of feathers was extensively cracked but had an interesting feature: it appears to show a silver reflective color in a distinct pattern. These tiny feathers have an apparent reflective substance on certain parts of primarily two adjacent feathers that show this pattern. In some angles a silver color is visible. How common is this? Do you think this is an actual color on whatever bird/non-avian dino it was a part of?
  12. It came up in another thread, so I figure it might be worth discussing: Let's talk resin pigments! Personally, I never bother with coloring the actual epoxy putty, but only because I'm more familiar with painting. I have from time to time, mixed in colored clays or matrix powders, but this was more for texture than color. I've seen folks use mixed colors of polymer clays to achieve these effects, but to be frank, I have yet to see a polymer clay that is durable enough to meet my needs and standards. However, I recently discovered that there are many inexpensive pigments/dyes specifically designed for epoxy resins. The advent of UV resin 3D additive printing and the popularity of liquid resin casting for geegaws and doodads has made them numerous and cheap. I'm curious. Do any of you use/have tried these with the putties (Apoxie/PaleoSculpt/etc.). They are in fact designed for liquid resin use, but chemically, they should be compatible with the putties without sacrificing bond time and strength in theory. I also see many dry pigment powders for the same use, those being formulated specifically for putties. I plan to buy some of the liquids for an "amber" project in the near future (I am NOT letting students play with real amber full of bugs and such when I can fake it in the name of inexpensive teaching aids!) I suspect this may be the solution to the translucency in some fossils that is so difficult to recreate via paint. Any thoughts?
  13. Looking at wasps preserved in Amber under electron microscopes confirms they had structural color 99 million years ago. Flies and beetles too. https://phys.org/news/2020-06-amber-fossils-true-million-year-old-insects.html
  14. I am always happy to find any fossil, but finding some colorful ones is always a special treat. I don't live in Canada with amazing Ammolite Ammonites, but I have collected some pretty cool colorful things myself. What are your most colorful fossils? Show me! A Rainbow of Ram's Horns -Illymatogyra arietina - Texas Cretaceous Colorful Crinoids - Texas Pennsylvanian Some more Illymatogyras that are just colorful in and of themselves: Ammonite from England: Ammonite from North Sulfur River, TX
  15. I got this petrified wood. But couldn't know what kind of wood it was. Any comment?
  16. New technique to measure melanin type applied to 3MYO mouse fossil. Allows reconstruction of coloration. https://m.phys.org/news/2019-05-reddish-ancient-fossil.html
  17. SharkGirl

    mostly fozzz 045

    From the album: 2012/13 Discoveries

    My fav Mako. frm a crk
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