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  1. oilshale

    Hypsiprisca sp.

    Juvenile Priscacara can be easily distinguished from juvenile Hypsacantha by their distinctly rounder body shape. Grande distinguishes two forms of Hypsiprisca: Hypsiprisca hypsacantha (originally described by Cope in 1886 under the name Priscacara hypsacantha) and a second yet undescribed, closely related form Hypsiprisca sp. H. sp. is more common than H. hypsacantha: H. sp. are mostly very small individuals less than 60mm long. Quotation L. Grande (2013): "The second species that remains undescribed differs from H. hypsacantha in being more slender-bodied and having a more convex posterior tail fin margin (H. hypsacantha has a very slightly forked tail margin)." References: Whitlock, J. (2010). Phylogenetic relationships of the Eocene percomorph fishes †Priscacara and †Mioplosus Journal of Vertebrate Paleontology Volume 30 – Issue 4, pages 1037-1048. Grande, L. T. (2013). The Lost World of Fossil Lake: Snapshots from Deep Time. University of Chicago Press. ISBN: 13: 978-0-226-92296-6.
  2. This is a re-post of a topic I started late this last summer, but got lost during the August forum migration. Late in July I took a trip with a few friends out to the American Fossil Quarry and Fossil Butte National Monument to hunt for fossils out of the lower Eocene Green River Formation. The Green River Formation is a lagerstatte which is perhaps the best site in the world for articulated fossil fish, many of which also display varying degrees of soft tissue preservation. Fossils from this locality are mined commercially and are ubiquitous on the fossil market. Living in Denver, the Green River Formation is only a few hours away by car and I've always wanted to plan a trip out there to collect it, which is very easy to do and fairly cost-effective thanks to numerous pay-to-dig quarries where you get to keep essentially everything you find. I decided to plan a dig at American Fossil Quarry, which is one of the more popular quarries. I managed to convince two of my friends to come with me, and we spent a day and a half (12 hours total) at the quarry while camping at the nearby Lake Viva Naughton. It was my two friends' first times ever hunting for fossils, and they both report that their expectations were far exceeded at the quarry! There's a very good chance this trip was the start of the making of two new fossil fanatics. We had a blast out in the quarry, with the thrill of discovery doing plenty to stave off the oppressive sun and desiccating dust. We also made sure to visit some of the fossil shops located in Kemmerer and spent some time at the museum in the visitor's center of Fossil Butte National Monument, which is fantastically well put together and was so awesome to see. Each of us found plenty of treasures, including lots of Knightia and Diplomystus fish as well as coprolites (fish, stingray, and turtle), scales, occasional plant material, and even a few rarer fish. Here's some pictures from our adventure: Myself posing with a very nicely preserved Knightia eocena. My two friends hard at work splitting shale for ancient treasures. A few of my day one finds on my shelf. A very nice partial Priscacara found by one of my friends. A small stingray with associated Knightia found by a different participant the first day we were there. A mostly complete Amphiplaga brachyptera (one of the rarer fish) found by me, associated with a Knighta alta. Only the tail and part of the dorsal fin is missing, the rest of the fish is intact! Easily my prettiest fish: An absolutely perfect Diplomystus dentatus found by me the second day. One of the displays at the visitor's center of Fossil Butte National Monument. Cheers, and thanks for reading!
  3. Hello, I'm from Austria (Europe). And this is my first time here on the forum. When I was 10 years old, in addition to the dozens of bones, I also found a cave bear canine tooth (tip with end of enamel: almost 4cm with root 6cm) in the dragons cave near Mixnitz in Styria. I never made such a great find again: that was the end of my short excavation career. In the last years I've only bought small things: trilobites, amonites and this week I stumbled upon the fish. I bought the petrified fish as a gift for a special occasion. Indicated from the dealer: fossilized fish (Pricacara liops), Green River, Wyoiming, USA, Tertiary, Eocene, approximately 42 million years. Size Fossil: 40.5 cm (I measured the body axis, not the matrix). Matrix (rock slab): 45,5 cm (length, upper longer edge) x 28,5 cm (average) At first Priscacara liops seems wrong to me because it is smaller. In't it? Priscacara serrata grows to about 37 cm tall?! And unfortunately I don't know exactly how big the Priscacara hypacanthus will get. BTW: In my opinion the body shape doesn't fit either. Question 1: Which fish is this actually? Question 2: It seems to me that the beige matrix (plate) was helped with paint. Please see the photos with the arrows. In one place, paint or a piece of rock seems to have chipped off (as long as it was just beautified), that's not so tragic for me. Question 3: Is the fish a real fossil, in your opinion? So that you can get an idea, I have put up unedited photos (except for the arrows + text). I also photographed the back of the matrix (stone slab) and also the edge; also a few detailed shots. Thank you in advance. Greetings, Rod
  4. Daveos

    Priscacara prep

    Just finished up this 2nd Priscacara prep job from 18" layer. I'm noticing each fish is its own beast, some are in softer stuff and some harder. Did this one between 20 and 30 psi. I keep getting fish that seem to have damage to the tail before they are buried. Also picked up a 12v electromagnet on Amazon. Works great for collecting the iron powder. Click it on, collect, click it off.
  5. Hi all- Would anyone be able to advise on where I might get unprepared Priscacara (tails at least) fossils for practice. Thanks so much for your help. K
  6. Mioplosus_Lover24

    Pathological Cockerellites liops (Cope, 1877)

    This is a Cockerellites I found last year and had prepped out. It came out in a pretty gnarly split and had to be glued back together and prepped. With slight restoration it turned out very well. Looking closely at the anal fin spines, you'll notice the pathology, this specimen has 4 instead of the usual 3. This is most likely a pathology of a Cockerellites liops instead of a new species.
  7. Everyone I've encountered on this site has been very helpful, so thank you. However, I'm in need of more help. For the last year I've been collecting real fossils in the field and selling some to pay for more exotic rocks. In a recent post I found that my Solnhofen shrimp is, if not totally, mostly fake. Now I'm quite suspicious of my entire purchased collection and was hoping you could help me identify fakes. The first two pictures are apparently Priscacara, Green River Formation, Eocene; the next two supposedly Asteroidea, Morocco, Ordovician; the last three supposedly Triassic, Arizona petrified wood--this came from the same group that sold me the fake shrimp. All help is appreciated.
  8. RobFallen

    Cockerellites (Priscacara) liops

    From the album: Robs Fossil Collection

    Green River Formation, Eocene Period, Kemmerer, Wyoming, USA Age:- 55 Million Years Old Size of Fish = 11.4 cm (4.5 inches) long. Overall Size = 19.1 cm (7.5 inches) wide by 19.1 cm (7.5 inches) high
  9. Managed to get another small/baby Keichousaurus for my small but growing fossil collection, I quite like it I also managed to find a couple of nice books too
  10. Top Trilo

    Fish prep

    Finished this fish yesterday, preservation wasn’t terrible. The head Isn’t preserved well and neither is the tips of the fins but anything is better than my first prep which was on an exploded knightia. Could of turned out better but I’m satisfied with it. I have a couple questions. 1. can you tell if it is a priscacara or a cockerellites? I believe they are two different genera with different species. 2. What is the part in front of the fish’s head? It’s not bone, it’s very thin and different, I have no idea what it is. Oh and I was prepping with a not so sharp needle thing, criticism and tips are welcome
  11. KompsFossilsNMinerals

    Cockerellites I prepped roughly a month ago

    This is a Cockerellites I prepped about a month ago. I used a dremel lightly to get the top layer of matrix off, then used a regular pick for the finer preparation. For my second Cockerellites prep ever, I think I did a pretty good job. The coolest part of this piece is that there is a long piece of coprolite(?) ontop of its head. I have no clue if this would bring up the value, I kind of doubt it would though.
  12. I recently purchased a Priscacara specimen with what appears to be four anal spines. In his book "The Lost World of Fossil Lake", Lance Grande mentioned that there is a possible new species with four anal spines and an elongate body. I am including a couple of photos and would like feedback as to whether this is truly a Priscacara with four anal spines; and if so, what is the status of this being describe as a new species or just a mutation. Your comments and feedback will be greatly appreciated. Thank you for your time.
  13. Pagurus

    Fish paintings

    I'm working on some new fossil fish paintings and thought I'd share them here. I'm trying to work my way through the Green River formation fish first, though I'm sure I won't paint them all. I've only done two so far, but I'll add more as I paint them. The quality will vary, I'm sure. Here's my take on a Priscacara. and of course a Knightia: I've started on a diplomystus, and will post that soon. Thanks for looking. Oh, for those interested, I'm using gouache paints, similar to watercolor but more opaque.
  14. Hey everybody! I realized I never made a thread for my internship at the Field Museum in Chicago this summer. I interned as a fossil preparator under Akiko Shinya in the McDonald’s Fossil Preparation Laboratory (that’s the “fish bowl” lab on the second floor right next to Evolving Planet with the big window). There were some amazing things being prepared in the lab - an Antarctic Lystrosaurus, lots of Dicynodonts, Green River fish (some massive Phareodus), Sauropod femurs and ribs, a massive slab containing several sturgeon and paddlefish - but I’m not sure if I am allowed to post pictures of them, so for the sake of confidentiality I won’t just in case. This is the lab, and I always sat in the red chair, right up next to the window. One of my favorite parts of this internship was seeing all the little kids so excited about what we were doing in there and interacting with them. I was preparing a Priscacara serrata (specimen PF 16961) from the Green River formation of Wyoming, Eocene (~52 mya). All I used was a pin vise and an Amscope stereoscope. This fish also seemed to have slightly “exploded” from the pressure of fossilization as well, it’s jaw was crooked and head smashed, thought most fins seemed surprisingly well intact. The prep took 199.5 hours to complete, from May to August. I finished the prep on the final day of my internship, staying late after the museum had closed to the public and all the others in the lab had gone home. But it was far worth it, because "your name will forever be associated with this specimen." -Akiko Shinya I took a picture at the end of every day and I made a time lapse with it to see the growth! The link is at the bottom of the post. (I kept that floating scale in front of its mouth because I thought it was kind of funny that it looked like the fish was trying to eat it!) You can watch the time lapse Here
  15. Well, I’m finally getting to dig into my truckload of fossils from my Wyoming trip with @RJB so it’s my turn to open up a prep thread. I spent a couple hours today poking around to find the perfect fish to start with. The 18” layer never disappoints. This good sized Diplomystus has 2 Knightia on top of it. I’m going to try to save both but I’m concerned that the right hand one is covering most of the Diplo’s skull. If that’s the case, the little guy will have to go! This is after about 90 minutes of scribe work.
  16. Thecosmilia Trichitoma

    Priscacara or Cockerellites

    What is the proper name for Priscacara/Cockerellites fish, Priscacara or Cockerellites?
  17. Bone guy

    Priscacara indet. (Juvenile)

    From the album: Green River Formation

    This is a very small 2.5 inch long Priscacara indet. These fish can easily be mistaken for a Knightia or an Amphiplaga because of the similarity in shape.
  18. Vaniman

    Fish IG.jpg

    From the album: Priscacara

    Vaniman <a href="http://www.yahoo.com">Vaniman</a>
  19. From the album: Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  20. From the album: Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  21. From the album: Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  22. From the album: Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  23. From the album: Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  24. From the album: Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  25. From the album: Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
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