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Found 388 results

  1. Sirenites sp.

    From the album alpine triassic Ammonoids

    Sirenites sp. from the Triassic/Carnian, upper aonoides zone. Hallstatt limestone of Austria. Size is about 6cm. Good to see on this specimen is the characteristic feature of Sirenites s. s. that each single rib ends in two venter nodes.
  2. Two Keichousaurus

    Just sharing both of my keichousaurus, the smaller one at the top just arrived yesterday after being lost in the mail for MONTHS. I think they look great together!
  3. Coelacanth Skull from North Bergen, NJ.

    From the album Triassic

    Diplurus newarki (coelacanth skull) Upper Triassic Lockatong Formation Newark Supergroup Granton Quarry North Bergen, N.J. A gift from Fossildude19, collected 11/27/17
  4. Not a clue but interesting form. My first thought was a weather form ammonite fragment? Found near the Palo Duro Canyon in TX. The area in question includes the following formations. Tecovas Formation: Triassic Trujillo Formation: Triassic Ogallala Formation: Late Miocene to early Pliocene Any help or direction would be appreciated.
  5. I have one more small Triassic Diplurus coelacanth fish collected many years ago in North Bergen, New Jersey. The fish's head is slightly lifting off the shale matrix along its top and bottom, but remains well attached at the front and back of the head -- see the photos. The lift gap along top and bottom is at most 0.5 to 0.67 mm. Pressing on the head results in a micro-movement down. With careful handling, I don't believe that the head is in any danger of fully detaching. I have little background in prep work, so I would like to ask opinions on: Should anything be done to cement the head down? And a related question: what cementing technique can be used given that the gap is under one mm. I appreciate any thoughts on this.
  6. Keichousaurus hui Young, 1958

    From the album Vertebrates

    Keichousaurus hui Young, 1958 Middle Triassic Zhuganpo Formation Xingyi Guizhou PRC Length 4cm
  7. From the album Vertebrates

    Sinosaurichthys longimedialis Wu et al., 2011 Middle Triassic Anisian Daaozi, Luoxiong Luoping yunnan PRC
  8. Hypocladiscites subtornatus.jpg

    From the album alpine triassic Ammonoids

    Hypocladiscites subtornatus (MOJS), 10cm diameter, together with Mojsvarites agenor(left side), Joannites sp. and orthocone Atractites sp. Triassic/lower Carnian aonoides zone. Hallstatt limestone of Austria.
  9. Trachysagenites eximius.jpg

    From the album alpine triassic Ammonoids

    Small slab with Trachysagenites cf. eximius MOJS.(Ammonoid with nodes, 2.5cm diameter) Associated with Arcestes sp., Megaphyllites sp., Paratropites sp., "Sandlingites" pilari and Isculites sp. Probably lower Tuvalian Dilleri Zone.
  10. Tuvalian.jpg

    From the album alpine triassic Ammonoids

    This part of a Triassic/Tuvalian ammonoid lense show probably the lower ammonoid zone(Dilleri Zone) of the Upper Carnian/Tuvalian stage. The upper half of the picture show a few Trachysagenites erninceus(ammonoids with stroger nodes) and a Tropites sp. core upon left. The lower part show Spirogmoceras sp., Traskites sp. and Paratropites cf. multecostatus with Isculites heimi(flat variant)
  11. Fish or Mosasaur tooth?

    Good evening, this was the smallest tooth I have found in a creek bed. This creek is in Travis county and mainly contains tributary terrace deposits
  12. Triassic footprint or reptile skin print?

    Hi Is this skin or retile footprint ? Age:Triassic Location:Poland Size: 3 cm x 2 cm ( skin) and full specimen size 6 cm x 5,2 cm
  13. The evolution of theropod hands has taken quite a journey from the late Triassic to the late Cretaceous. This paper tries to explore the evolution of early theropods Coelophysis bauri and Megapnosaurus rhodesiensis Abstract: The origin of the avian hand, with its reduced and fused carpals and digits, from the five-fingered hands and complex wrists of early dinosaurs represents one of the major transformations of manus morphology among tetrapods. Much attention has been directed to the later part of this transition, from four- to three-fingered taxa. However, earlier anatomical changes may have influenced these later modifications, possibly paving the way for a later frameshift in digit identities. We investigate the five- to four-fingered transition among early dinosaurs, along with changes in carpus morphology. New three-dimensional reconstructions from computed tomography data of the manus of the Triassic and Early Jurassic theropod dinosaurs Coelophysis bauri and Megapnosaurus rhodesiensis are described http://onlinelibrary.wiley.com/doi/10.1111/joa.12719/full/ The evolution of the manus of early theropod dinosaurs is characterized by high inter- and intraspecific variation Authors Daniel E. Barta, Sterling J. Nesbitt, Mark A. Norell First published: 8 November 2017 DOI: 10.1111/joa.12719 joa12719.pdf
  14. Welcome to another microscopic look into the wonderful world of coprolites. Here we have a squished (flattened) spiral coprolite from the prehistoric floodplains that now form the Bull Canyon Formation in the badlands of Quay County, New Mexico. Today's mystery was most likely not ingested. Many times the posterior (non-pinched end) of spiral coprolites can be hollow. I may be wrong, but I think this branchy thing (for lack of a better term) slipped in after it was expelled. To me this looks like part of a branch from a delicate coral - but the poop was in fresh water. Any ideas?
  15. Season End

    That was probably my last trip this year. I decided to do a prospecting round. Crawl on the ground for six hours. The result was meager. Got some new insights but no good finds. Two Carnian Joannites sp. ammonoids were my find of the day. The Norian ammonoids of this layer I left in field. Nevertheless, it was a nice day. I met several of these yellow-black little guys. Now it is raining and weather forecast reports snow down to 600 meters altitude for tomorrow. regards Andreas
  16. triassic footprint fossil?

    Hi Is this footprint fossil? Age : Triassic Size: near 15 mm x near 12 mm
  17. Rhacophyllites debilis HAUER

    From the album alpine triassic Ammonoids

    Rhacophyllites debilis HAUER, from Triassic/Norian Hallstatt limestone of Austria. Size of Ammonoid is 13cm.
  18. Discotropites sandlingensis (HAUER)

    From the album alpine triassic Ammonoids

    Discotropites sandlingensis (HAUER) from Tuvalian Hallstatt limestone. Size of the ammonoid is 8cm.
  19. From the album alpine triassic Ammonoids

    Block with several Epigymnites cf. arthaberi and Proarcestes subtridentinus. Ladinian Hallstatt limestone of Austria. Size of the block about 40cm.
  20. Rhacophyllites neojurensis (QUENSTEDT)

    From the album alpine triassic Ammonoids

    Rhacophyllites neojurensis (QUENST) from Alaunian 2(bicrenatus Zone) Hallstatt limestone. Size 17cm.
  21. Hello, this is a part 2 of my last thread with some of my other finds that I've found this at a site in new jersey where some footprints have been found from the Late Triassic/Early Jurassic, I am unsure about if these are footprints of sorts, any help will be appreciated thank you!
  22. Hello, I've found this at a site in new jersey where some footprints have been found from the Late Triassic/Early Jurassic, I am unsure about if this is a footprint of sorts, any help will be appreciated thank you!
  23. Phytosaur

    From the album Dinosaurs and Reptiles

    Machaeroprosopus=Pseudopalatus? Bull Canyon FM, New Mexico
  24. I was going through a large group of very small Triassic coprolites today and came upon this. Since there was a beat up Koskinonodon tooth in with the coprolites, I'm wondering if this could be a jaw or maxillary fragment from a juvenile. The person who found the coprolites said that he found a lot of Koskinonodon teeth in the area as well some from Phytosaur, Apachesaurus, Coelophysis, Postosuchus, and Revueltosaurus. What do you all think? Jaw or maxillary? Amphibian, fish or something else? If this is amphibian, can anyone identify the bone above and to the left of the teeth? My cat votes amphibian @Carl check it out!
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