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  1. Dpaul7


    From the album: MY FOSSIL Collection - Dpaul7

    Green River Formation, Rock Springs Region, Wyoming, USA Data: Knightia is an extinct genus of clupeid clupeiform bony fish that lived in the fresh water lakes and rivers of North America and Asia during the Eocene epoch. The genus was erected by David Starr Jordan in 1907, in honor of the late University of Wyoming professor Wilbur Clinton Knight, "an indefatigable student of the paleontology of the Rocky Mountains." It is the state fossil of Wyoming,and the most commonly excavated fossil fish in the world. In Knightia fish, rows of dorsal and ventral scutes run from the back of the head to
  2. The Trip That Nearly Didn't Start (Lengthy image-intensive trip report follows) Tammy and I had planned a fossil hunting trip to Wyoming for the third week of September to redeem our day of digging (splitting rock) at the Green River Formation quarry that @sseth had earlier so generously offered up as a prize on an auction to benefit TFF. We had our airfares, a rental car reserved, and a series of hotels booked across the state ready for a monumental fossil hunting trip. The one small problem was the not so small storm named Hurricane Irma that tore through the northern
  3. Thought I would share this here as well as in Blake's post. You can stop by the Coliseum show in Denver and see it in person at (FossildudeCo ) Blake's booth. @FossilDudeCO Icaronycteris Index, found at our American Fossil quarry in August, 2017! Icaronycteris Index is one of the oldest bat species on the planet. It lived some 51 million years ago in the Eocene epoch in Wyoming. Icaronycteris was a primitive bat, emerging very early in the age of mammals. Modern bats have only a single claw on their first digit, but Icaronycteris also had another one on the second digi
  4. So I have this small block of Green River matrix that has fish material. When I got it, A part has been prepped, exposing most of it, but then I checked the corners, saw more covered material, and realized that it could be prepped even further. The problem is, I don't have any prepping tools because I've never prepped a fossil before But maybe is there any household tools that could efficiently prep Green River matrix? I just need to remove one tiny layer.
  5. Hi all, I saw this Diplomystus online for sale. I was surprised by the prize: 20$! But then I started to get a little suspicious. Though most fakes are mosasaurs and keichousaurs, I heard that fossil fish from the Green River formation are often re-painted so that they look more splendid. Though I am pretty sure that this specimen here was originally 100% real, I think that it might have been painted on. Is my suspicion right, or is this one 100% natural? Here is the info they gave: What do you think? Thanks, Max
  6. Hi everyone! I am totally new at collecting fossils. My family and I went to a place south of Vernal and dug in the Green River Formation and found several leaves and insects. My question is do I need to put something over them to protect them? I have read about duco cement for bones, but I didn't read anything for leaves. I am assuming that the insects found in the same formation would be preserved the same way. I included pictures of some of the insects we found. Any advice will be greatly appreciated! Anthony
  7. Fossil-Hound


    I just couldn't resist purchasing this Knightia, from the Green River Formation in Wyoming from a local craigslist seller. Yes I do troll craigslist a lot looking for all the coolest gadgetry. Well the lady I bought it from said it was gifted to her and that she had no clue what it was and didn't want it. She sold it to me for $10. I plan on taking a trip to the Green River Formation but just in case I don't make it out I decided to get this 7" beauty.
  8. snolly50

    Plant ID?, Green River

    Here are copies of images that Kris posted in the "Auction prep" topic. The slab he is prepping contains this large plant fragment. I have scanned Grande's text looking for a match, but have had no success. Does anyone have a clue as to a possible donor of the fragment? Also check out Kris' interesting prep series on this Notogoneus specimen.
  9. For the second year in a row, I took a long, two-week vacation to Wyoming, Utah and Colorado in late August and early September. It was a nice vacation but perhaps a bit too long. The highlight of my trip was visits to the Warfield fish quarry in Kemmerer, WY, the Blue Forest in Eden Valley, WY, Wamsutter, WY for "Turritella Agate", Great Basin National Park in Nevada and Douglass Pass in Colorado. I've been working on a really involved narrative of the whole trip but it is taking some time and I'm running out of steam so I wanted to get some pictures and summaries up on the Forum.
  10. Amyzon is a Catostomid fish so far known from most of the Lake Gosiute localities but not in Fossil Lake deposits or Lake Unita deposits. Taxonomy from Mindat.org. Diagnosis from Grande et al. 1982, p. 524: "A species of Amyzon which differs from all others in having the following combination of characters: body depth 36 to 44%, head length 29 to 33% of standard length; 22 to 24 principal dorsal fin rays; 34 or 35 vertebrae (including Weberian complex); long pelvic splint (unsegmented bony ray) about 50% or more of fin length. Of the six previously described species of Amyzon, A. gosiut
  11. Calciavis grandei: An awesome new Green River bird species for all you fossil hunters in Wyoming! Palaeoart (by Velizar Simeonovski) From SciNews: "A nearly 50-million-year-old bird fossil unearthed in Wyoming represents a new species that is a close relative of living kiwis, ostriches, and emus, according to a team of paleontologists from the American Museum of Natural History and the Virginia Polytechnic Institute and State University. The ancient bird, named Calciavis grandei, is believed to be roughly the size of a chicken and was mostly ground-dwelling, only flying in short bursts
  12. oilshale

    Gosiutichthys parvus Grande, 1982

    References: Lance Grande. 1982. A Revision of the Fossil Genus Knightia, With a Description of a New Genus From the Green River Formation (Teleostei, Clupeidae). AMERICAN MUSEUM NOVITATES. NO. 2731
  13. oilshale

    Erismatopterus levatus (Cope, 1870)

    References: Fossil Butte National Monument Geologic Resources Inventory Report, NPS/NRSS/GRD/NRR—2012/587 Grande, L. (1984) PALEONTOLOGY OF THE GREEN RIVER FORMATION, WITH A REVIEW OF THE FISH FAUNA. THE GEOLOGICAL SURVEY OF WYOMING, BULLETIN 63.
  14. Taxonomy from Grande & Bemis 1998. Diagnosis from Grande & Bemis 1998, p. 247: "†Cyclurus gurleyi differs from all other species of the genus by the following adult characters A through D. (A) The body is relatively short and deep, deeper than known for any other amiine and most other amiid species. Body depth of adult sized individuals (e.g., specimens over 120 mm SL) is 35-42% of SL (Table 62), compared to 27-32% for †C. kehreri (Table 52); 19-21% for †C. efremovi (Table 72); 20% for †C. valenciennesi; 30-31% for †C. ignotus; 24-27% for †C. macrocephalus; 18-29% for Amia (Tables
  15. oilshale

    Notogoneus osculus Cope, 1885

    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 following characters: (1) the subopercle bears a series of deep clefts along its posterior margin; (2) the first and second hypurals are not fused to each other; (3) the parhypural is not fused to the vertebral column; (4) the first and second hypurals are not fused to the vertebral column; and (5) scales in adults are nearly the length of a centrum. Also, the frontal is a paired element in †Notogoneus (vs. median in Gon
  16. oilshale

    Notogoneus osculus Cope, 1885

    References: L. Grande and T. Grande (2008) Redescription of the type species for the genus Notogeneus (Teleostei: Gonorhynchidae) based on new, well preserved material. The Paleontological Society Memoir 70:1-31 [M. Uhen/M. Uhen].
  17. oilshale

    Hypsiprisca sp.

    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: Whitloc
  18. sseth

    Mioplosus labracoides

    The Mioplosus is an extinct genus of Percid fish that lived from the early to middle Eocene. These fish were predators in Fossil Lake's large ecosystem.
  19. sseth

    Priscacara serrata

    Priscacara Serrata is one of several species of recognized in the Green River formation. It is less common that its relative the Priacacara Liops.
  20. oilshale

    Astephus antiquus (Leidy, 1873)

    Astephus and Hypsidoris are both members of the Family Ictaluridae, native to North America. Green River catfish are easily recognized by their stout dorsal and pectoral spines, scale less bodies and broad skull. Ictalurid species have four pairs of barbels (or whiskers). Like modern catfish, they possessed a vibration sensitive organ called the Weberian apparatus. The Weberian apparatus consists out of specialized vertebrae at the front of the spinal column which passed vibrations to the inner ear using the swim bladder as a resonance chamber. The structure essentially acts as an amplifier o
  21. oilshale

    Masillosteus janeae GRANDE, 2010

    Characteristic for Massilosteus is the - for a Lepisosteiformes - extremely short snout. References: Grande, L., Kammerer, Ch. & Westneat, M. (2006) Comparative and Developmental Functional Morphology of the Jaws of Living and Fossil Gars. Journal of Morphology, Vol 267, Issue 9, 1017-1031. Grande, L. (2010) An Empirical Synthetic Pattern Study of Gars (Lepisosteiformes) and closely related Species, based mostly on Skeletal Anatomy. The Resurrection of Holostei. Copeia, 2010, No 2A, 1-863.
  22. oilshale

    Mioplosus labracoides COPE, 1877

    References: John A. Whitlock (2010) Phylogenetic relationships of the Eocene percomorph fishes Priscacara and Mioplosus. Journal of Vertebrate Paleontology 30(4):1037–1048. Lance Grande (2013) The Lost World of Fossil Lake: Snapshots from Deep Time. Edition: 1 Publisher: University of Chicago Press. ISBN: 13: 978-0-226-92296-6.
  23. oilshale

    Hiodon falcatus GRANDE, 1979

    Today, the family Hiodontidae is represented by two species and a single genus (Hiodon) restricted to North America. They are large-eyed, fork-tailed fish that physically resemble shads. The “goldeye”, Hiodon alosoides, is widespread across Nord America. It prefers turbid slower-moving waters of lakes and rivers. The mooneye, Hiodon tergisus, is also widespread across North America, living in the clear waters of lakes, ponds, and rivers. Hiodontids feed mainly on insects, insect larvae, and a few small fish. The fossil genus Eohiodon was set up by Cavender in 1966 based on
  24. oilshale

    Amphiplaga brachyptera Cope, 1877

    Amphiplaga is one of the rarer of the Green River fish fossils, making up some 1% of the total from Fossil Lake, its only known location. Amphiplaga belongs to the family Percopsidae within the order Percopsiformes. The Order Percopsiformes is a small order of North American freshwater fishes that includes three families: Amblyopsidae (cavefishes); Aphredoderidae (pirate perches); and Percopsidae (trout-perches). Closely related to neither trout nor perch, trout-perches have characteristics of both the trout and perch families. They exhibit characters of the salmonids, such as an adi
  25. sseth

    Bechleja rostrata

    This amazing shrimp is from my quarry in the Green River Formation near Kemmerer Wyoming. This fossil was found in 2015.
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