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  1. oilshale

    Notogoneus osculus Cope, 1885

    Very young fish (27mm) in which the scales have not yet ossified. Juvenile specimens of Diplomystus dentatus can easily be mistaken for juvenile specimens of Notogoneus osculus. But juvenile Notagoneus can be easily recognized by the larger skull and the position of the anal fin, which is set far back. For comparison a specimen of a juvenile Diplomystus dentatus preserved on the same slab: Taxonomy from Fossilworks.org. Revised generic diagnosis from Grande and Grande 2008, p. 10. "†Notogoneus differs from all other genera in the family Gonorynchidae by the fol
  2. 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 petr
  3. Ptychodus04

    Upcoming Prep Project

    Here’s a tease of one of my upcoming prep projects. It’s not next in queue but it’s coming soon. I spent some time doing exploratory prep on it for the last couple of days. Anyone know what it is? I’ll give you 2 hints. It’s from the Green River Formation and it’s not a fish.
  4. Tigereagle12345

    Green River Fish, Knighta or Diplomystus?

    I recently finished preparing a fish fossil from the Green River formation that I purchased online. The site said that the fossil would be either a Knighta or a Diplomystus. From looking at images, the face seemed to look like a Diplomystus but the body seemed more like Knighta. Could anyone tell me which it is? Thanks in advance, Tigereagle12345 Measurements are 11.5 cm by 2.5 cm
  5. 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.
  6. oilshale

    Atractosteus simplex (Leidy, 1873)

    Atractosteus simplex and A. atrox occur mainly in Fossil Lake deposits where they are relatively rare (less than 0.05% of the fish fauna). The long snouted gars are much rarer in Lake Gosiute and Lake Uinta deposits. Taxonomy from Fossilworks.org. Emended species diagnosis from Grande 2010, p. 471: “†Atractosteus simplex differs from other species in the genus by the following characters A-E. (A) Having a lower number of lateral line scales than any other species except for †A. messelensis sp. nov. (Table 184). (B) Having a lower number of abdominal vertebrae than any other species except
  7. I found this rock near Green River Utah, east of the San Rafael Swell. Can anyone help me identify it?
  8. gond

    Knightia eocaena

    Complete specimen of Knightia eocaena. Reference: Lance Grande 1984. "The paleontology of the Green River Formation, with a review of the fish fauna". Wyoming Geological Survey, Bull. 63, pp. 85-86-87 for description of the species, pp 93-95-96-100 for images.
  9. jnicholes

    Green River formation Fossil ID

    On August 12, 2021, I went with my family to a fossil dig in Kemmerer, Wyoming. Two friends from Japan went with us also. We all found a lot of fossils that day. The two friends from Japan even found a small whole Phareodus testis! There was, however, one fossil that was unusual, and we couldn’t get the exact species. Picture is attached. All the people at the quarry said was that it’s a wood imprint, or something like that, I don’t exactly remember. Here is the question. Is this a wood fossil? Second question, if it is wood, is it po
  10. I bought this ratty broken split fish several years back at an auction really, really cheap. It was mis-identified as a "Priscacara liops". It was my introduction to Green River fish. This fossil has some revealing details. This is a 7" Priscacara serrata and it displays the characteristic molariform teeth in the pharyngeal region that would normally be hidden in a more intact specimen. This type of tooth is for crushing prey. I would say this broken fellow displays these pharyngeal teeth even more clearly than the picture in Lance Grande's The Lost World of Fossil Lake. And he must have had t
  11. Nipponites

    Green River fm.

    Hello, Next summer I am going to visit Northamerica for my first time, and would really like to visit a Green River commercial quarry; my problems (doubts) are: Which one is the better quarry?, referring to abundance and variety. I live in Spain, and I guess the fossils are too heavy to carry on a plane, so I thought to send them by mail, will I have problems with customs?. In that case, can someone from the quarry provide me a certificate that these fossils have been legally collected? Which messaging company should I use?, preferably a careful one.
  12. Lmshoemaker

    Help with green river fish.

    Hello! When I bought my air abrasive a year ago the guy that I bought it from gave me a bunch of unprepped green river fish as he was retiring. One issue that seems to commonly come up is that no matter how low I set my psi or how slow I go on some fish the "skin" seems to pit and develop holes. Is there any way to avoid this? I've gone down to as low as 1-3psi with dolomite and this still happens. I've noticed that it tends to happen on disarticulated specimens mostly, and part of me feels this is more of a preservation issue than anything. The guy I got my abrasive from also included paint I
  13. The Green River Formation is one of the most well-known fossil sites in the world, occupying present-day Colorado, Utah and Wyoming. This Lagerstätte has been noted for its well-preserved fish fossils, as well as numerous invertebrates, plants, and sometimes even reptiles and birds. Green River fossils are Eocene-aged, at 53.5 to 48.5 million years old. Thankfully, not only are Green River fossils attractive, they also remain affordable to the casual collector. Allow me to present my humble collection. Crocodile tooth Borealosuchus sp. Southwest Wyoming
  14. Hi everyone, I made a discovery of a Knightia on August 12th, 2021 at the green river formation in Wyoming. Today, I noticed something VERY interesting. Pictures are attached, one under a high power magnifier. As you can see, this Knightia did NOT get fossilized on its side. On the contrary, it is almost a top-down view of the fish. You can see one whole eye socket, as well as a part of the other, you can see where the spine attaches to the skull, the ribs go both ways, the tail is top down, the list goes on. It even looks like there are 2 nostrils, but this I am not su
  15. jnicholes

    Weird Coprolite ID

    So, I was going through my fossils from my last trip to Kemmerer Wyoming. One of them accidentally split, revealing this. It looks like a kind of Coprolite, but I’m not sure. It’s got scales in it, but it’s too flat to be regular Coprolite. I suspect it is stingray Coprolite, as the people there told us to watch out for it, because they have been finding a lot. Can someone help me ID this? Jared
  16. After my first glimpse of The Lost World of Fossil Lake by Lance Grande (if you don’t have it, get it at any price!), I was hooked on Green River fossils. Here is the first one I prepared myself. I bought it directly from one of several “storied” Wyoming quarries. It is from the 18-inch layer and is not found by splitting the fish but by detecting the raised surface of the skull and vertebrae. Then one must somehow scrape away the relatively soft matrix to expose the fossil below (perhaps 1 to 5mm deep). The tools I used are pine vises that held sewing needles. If I could safely scrape away la
  17. 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 watercol
  18. jnicholes

    Kemmerer WY trip 2021

    Hi everyone, My third trip to Kemmerer, Wyoming is in one week. I’m going to be digging in the Green River information. Last trip, I came home with a whole Mioplosus labracoides. This time, we have two friends from Japan digging with us. My goal for this trip is to find ANY decent fossil to show my Japanese friends who are digging with us. I don’t care what we find, as long as we all have fun. The only problem is, their suitcases are full. They can’t bring fossils back to Japan with them because they don’t have room in their suitcases. As a resul
  19. Day 5 in South Dakota was a total bust for my son and me. The section of the quarry we worked has large ironstone and clay boulders, but also has large bones. We sat next to a jacketed femur and worked back the wall face. We didnt find more than a few small bits at the end of the day, but I said that something big was there. Big rocks = big bones. Sure enough, Walter sat down in our spot 3 days later and immediately uncovered a ceratopsian dentary! By this point were were already on to our next destination in Kemmerer, Wyoming. 3 days of splitting shale for fish, hoping for th
  20. What a trip my son and I had this year! We started out in the Hell Creek fm of South Dakota. This was a special trip through Paleo Adventures for his "veteran" guests who have already spent a few years with him and could operate without supervision. We started out hunting a new ranch. This property is virgin ground with LOTS of acreage that needed exploration. The group was split into 3 teams, each taking a different area. Our team was further split into pairs. So, it was my son and me, exploring for new outcrops. The sun was intense, the temperature hot, and hours of hiking and sta
  21. jnicholes

    Kemmerer, Wyoming trip 3

    Hi everyone, So, I’m going back to Kemmerer, Wyoming for the third time on August 12, 2021. My entire family will be going as well as two friends from Japan. I’m going, courtesy of fishdig.com. I know the two from Japan will have a great time. I’m sure I’ll have a good time also. I wonder what I’ll find this time. Last time, I found an awesome Mioplosus labracoides. Picture attached. Jared
  22. PrehistoricWonders

    Air Scribes

    Hi all, I was wondering if anyone could give me advice on 1. air scribes you’ve found are good for fossil prep, and 2. All the parts needed for Scribes. I’m not quite sure all the parts needed for a scribe, I know you need the scribe itself and an air compressor, but I don’t know beyond that. P.s; the fossils I’ll be working on will be Green River fish, for the most part.
  23. Ludwigia

    Mioplosus labracoides (Cope 1877)

    From the album: Pisces

    37cm. long. Eocene (Ypresian/Lutetian). Green River Formation. 18" layer. Found at Stone Fossils Quarry, Lincoln County, Wyoming. Acquired from Kris (Ptychodus04).
  24. oilshale

    Atracosteus simplex (Leidy, 1873)

    From the album: Vertebrates

    Atracosteus simplex (Leidy, 1873) former name: Lepisosteus simplex Middle Eocene Green River Formation Kemmerer Wyoming USA Length 40 cm
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