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Showing results for tags 'triassic'.
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References: Wade, Robert Thompson (1935) The Triassic fishes of Brookvale, New South Wales. British Museum, London. Whitehouse, J. (2016) Beacon Hill shale quarry, Sydney, New South Wales, Australia: Geologic insights into its strikingly preserved Triassic fossil assemblage.
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Rauisuchians are some of my favorite prehistoric beasts, rather specific but I'm wondering if anyone on here on the forum has any material to show I'd love to see. So far I've been only able to obtain postosuchus teeth and recently begrudgingly missed out on some Batrachotomus kupferzellensis.
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Baby Keichousaurus, ventral view. Functional Morphology and ontogeny of Keichousaurus hui Reptilia Sauropterygia.pdf References: Liao JL, Lan T, Xu GH, Li J, Qin YJ, Zhao MS, Li YL and Wang Y (2021) Tooth Structure and Replacement of the Triassic Keichousaurus (Sauropterygia, Reptilia) From South China. Front. Ecol. Evol. 9:741851. doi: 10.3389/fevo.2021.741851
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From the album: Vertebrates
Australosomus merlei Piveteau, 1934 Lower Triassic Dienerian Sakamena Formation Ambilobe Madagascar Small to medium size fish (~ 10 to 15cm / 4 to 6"), fusiform body, relatively small head with a slightly rounded snout. Its dorsal fin is located in the posterior fourth of the body. Caudal fin divided with wide lobes. Scales on the flanks are noticeably stalk-shaped.- 1 comment
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From the album: Vertebrates
Paracentrophorus madagascariensis Piveteau, 1940 together with scavenging conchostraca (possibly Euestheria truempyi Kozur Seidel, 1982) Lower Triassic Olenekian Ambilobe Madagascar Length 8cm / 3" Small fish (up to 15cm / 6") with a rounded body, somewhat thickset appearance. Dorsal fin attached to the posterior half of the body. Pectoral and anal fin relatively large. Anal fin starts behind end of dorsal fin in close proximity to caudal fin. Caudal fin moderately divided. Eyes remarkably large. Paracentrophorus can be easily mixed up with Parasemionotus Lit.: Piveteau, J. (1940): Paléontologie de Madagascar XXIV Nouvelles recherches sur les poisson du Trias inférieur. Ann. Paleont., 28: 69-88 -
From the album: alpine triassic Ammonoids
Block with Syringoceras sp., Monophyllites simonyi, Arcestes sp., Megaphyllites sp. and several orthocone Nautiloids -
Taxonomy from Fossilworks.org. Due to its enormous pectoral fins, Icarealcyon malagasium was described by Beltan as a "poisson volant" - a "flying fish" - in the family Semionotidae (not related to what is now known as "flying fish" - these are Exocoetidae in the order Beloniformes). You would expect flying fish to be fast swimmers - the rather thickset appearance of Icarealcyon more likely hints to slow swimmers with relatively high maneuverability (comparable to Albertonia from British Columbia). Icarealcyon was described by Beltan on the basis of poor material - in all three specimens only the body without head was preserved. Icarealcyon is probably closely related to Albertonia, or possibly even a synonym. Line drawing from Beltan 1984, p. 78: References: L. Beltan. 1984. A propos d'un poisson volant biplan d l'Eotrias du NW de Madagascar: Icarealcyon malagasium Beltan. Annales de la Société Géologique du Nord 103:75-82
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- albertonia
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Hi fossils friends, Here are some of my last preparations : Lower Triassic Flemingites lidacensis (Welter 1922) - 19 cm
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Hello, Does somebody here knows where I can obtain permian or triassic vertebra fossils (no fish, exept shark) and reptiles, amphibians.... I prefer good quality. Thanks Thijs
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just finished a lower Carnian slab with two Nautiloids(probably Mojsvaroceras cf. perarmatus) Additionally a questionable bone fragment appeared during prep. (the second bone within 20 years of collecting in the Hallstatt limestone) Unfortunly I didn't take "before" pics because I didn't think that it turns out so well. Can anyone confirm that this is bone structure on the polished part? I think so, but I am not sure. The ammonoid on top is a Monophyllites simonyi. So the slab is of lower Carnian, Julian time. regards Andreas
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Just recently purchased one of these teeth for the cheap price of $14 dollars from a seller on ebay. I was wondering if anyone with more experience with fossils than I, could tell me if they believe this tooth to be authentic? The ebay seller has all positive reviews. Thank you.
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- coelophysidae
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Volcanic eruptions triggered dawn of the dinosaurs (Huge pulses of volcanic activity are likely to have played a key role in triggering the end Triassic mass extinction, which set the scene for the rise and age of the dinosaurs, new Oxford University research has found.) http://www.heritagedaily.com/2017/06/volcanic-eruptions-triggered-dawn-dinosaurs/115652 https://www.sciencedaily.com/releases/2017/06/170619151530.htm Dinosaurs got an evolutionary assist from huge volcanic eruptions by Mary Beth Griggs Popular Science http://www.popsci.com/volcanic-eruptions-dinosaur-evolution The paper is: Lawrence M. E. Percival, Micha Ruhl, Stephen P. Hesselbo, Hugh C. Jenkyns, Tamsin A. Mather, and essica H. Whiteside. Mercury evidence for pulsed volcanism during the end-Triassic mass extinction. PNAS, June 2017 DOI: 10.1073/pnas.1705378114 http://www.pnas.org/content/early/2017/06/13/1705378114 Yours, Paul H.
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While digging around in some bone bed (Triassic, Rhaetic, Penarth Group, Westbury Formation, Rhaetic Bone Bed Aust Cliff, River Severn, South Gloucestershire, UK.) I found this tooth. I must have cracked a ton of this stuff over recent years and have never found anything like it. Fossils of the area are marine reptiles tiles and fish. Common finds are fish teeth and coprolites, plesiosaur and ichthyosaur bones, mostly, unsurprising, vertebrae. Oh and thank you Ray @aerogrower it's first outing Your wisdom and comments please! Labial surface Lingual surface Occlusal surface Root end Stupidly I forgot to photograph the proximal sides but hopefully you can get a rough idea from the other shots.
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So I went to look for an owner of a potential site, I did end up getting an address but no one was home, so I decided to go to a previously unfossiliferous site. With this Gettysburg shale, you look for glossy layers (for some reason these are the layers with fossils. At the major exposure there was none, but under/next to a dirt boat ramp there was about five inch long three inch high outcrop of good stone. Yes, I got some strange looks poking at the ground with my trusty screw driver, but I got some small trinkets to show. I found these lines, most are different size and shape, one looks like the worm itself, although I feel I may be mistaken. Some hollow circles that look almost like crinoid columnals are present as well. This is most of what I found, tell me what you all think. I can take more pictures and provide more information. Note: there may be some repeats, i was just trying to get every picture before sundown.
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Taxonomy from Fossilworks.org. Emended Diagnosis from Clement 1999, p. 234: "Fish of small size, standard length about 13 to 14 cm and maximum body depth about 3 to 3,5 cm. Body shape very elongated. Pelvic fins situated immediately in front of the level of the first dorsal fin (but not connected to the pectoral girdle). Presence of descending processes of the posterior parietal, postparietal and supratemporal. Lachrymojugal very elongated, slightly curved and not anteriorly angled. Palatal surface of the entopterygoid covered with numerous parallel sinuous rows and tiny rounded denticles. Midpart of angular very elevated, presenting a well-developed posterior angle . Ossified parapophyses absent in the anterior part of the notochord and very small under the second dorsal fin, increasing in size as far back as the anterior part of the caudal fin. Ornamentation of the squamation consisting of about 15 well-marked ridges, parallel to the longitudinal axis of the scales." Identified by oilshale using Clement 1999. References J. A. Moy-Thomas. 1935. The coelacanth fishes from Madagascar. Geological magazine 72:213-226 Lehmann, J.-P. (1952): Étude complémentaire des poissons de l’Eotrias de Madagascar. Kungliga Svenska Vetenskaps-akademiens Hangdlingar (4), 2 (6): 1-201; Stockholm. Gael Clement (1999) The Actinistian (Sarcopterygii) Piveteauia madagascariensis Lehman from the Lower Triassic of Northwestern Madagascar: A Redescription on the Basis of New Material. Journal of Vertebrate Paleontology Vol. 19, No. 2, pp. 234-242 (9 pages).
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Okay, so I did not create this with my hammer,scribe, or trusty screwdriver, it's on a different slab than the other one but this one also has some raindrops. It's Triassic Gettysburg formation from near emmitsburg, MD. It is a strange pointed mark almost as if something was pulled across it. Not all is preserved, I know this because it stops and then starts again (last pic). I'm stumped, let me know what you guys think.
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Hello everyone, this fossil is in a larger plate with lots of raindrops from the Triassic Gettysburg shale of Maryland. It looks like a burrow but it could be a root or part of a larger footprint. What do y'all think?
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I found this up near emmitsburg, Maryland. It's got some strange lines. Is it a plant and if so any ideas as to what type, or am I stuck again with a burrow as I have been so many times before. It's Gettysburg shale (Triassic norian-carnian).
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I just split a Triassic shale piece from Thurmont, Maryland and I found these weird twin dots. Raindrop impressions are known from this formation but they are next to each other, any Ideas?
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Same deal as the last one. No idea what this is, might not even be a fossil. It's in red shale probably new oxford formation, maybe Gettysburg of Thurmont, Maryland. Remember, its famous for ichno fossils, so a trace fossil is first on my list of possibilities after strange erosion pattern. The black half spheres, sometimes yellow, are modern egg sacks, probably spiders. Tell me what you think!
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Hello everyone, today I went hunt in northern Frederick county, Thurmont to be exact, to look for fossils in Gettysburg shale. These are many interesting for sometimes preserving dinosaur and other reptile footprints. I ended up hunting in a river next to a trail that had abundant red shale, this may be new oxford or Gettysburg formation, either way Triassic material, (lean towards new oxford, abundant breccia) and I came across this strange thing. Is it a fossil or not? If a fossil what type and if not what is it? Tell me what you think. Btw I don't believe I found any tracks but I'm still looking at what I collected.
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Helllo friendly folks of the fossil forum, I have been searching for a coelacanth fossil on and off for years now. I finally found one that preserved all the characteristic fin "limbs" in profile from an Ebayer who acquired it while in Madagascar. I was pleased with the degree of preservation on both split halves. To my surprise, taking a hand lens to the more concave side revealed scale preservation. I know this is typical of bony fish with scutes like Gars from the Green River, WY - but! Is this unusually good for nodules in Madagascar? More to the point, am I keeping something away from the scientific eye that should be seeing this? I imagine 3-D scanning could reveal finer details for comparison to the living fossil ancestor today. Attached are photos taken with my iPhone and two photos through a regular light microscope at 2x magnification. Thank you for any advice or knowledge you may have on these classes of coelacanths. Warmly, Mark
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Old School Geology Trip: Birmingham Ridge UK c.1984
FunkyMonkey posted a topic in Fossil Hunting Trips
Hi, Carrying out a spring clean and I found this from an old school geology field trip I took in about 1984. This would have been from the Birmingham Ridge (UK) of Keuper bed Sandstone which dates to the Triassic. Unfortunately I cant be more precise on the location as my memory has faded and I have lost my old notes but it would have been somewhere in the proximity of Barr Beacon. According to the literature this would have been a river delta - to my eye these look more like ripples you'd find on a shallow beach. Or maybe they are nothing - I thought I'd share to see what the experts think. What I love about these - if they truly are fossilised ripples - is their fragility. A true snapshot in time frozen forever. Thanks for looking, Carl.thumb.JPG.6ca73df253a83368851447207b5cdf51.JPG)
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More Triassic Ammonoids prep. (Not the same that those of Andreas ;-))
Nothos posted a topic in Fossil Preparation
Hi fossils friends, here is a little taphonomic accumulation plate with many Olenekian (lower Triassic) Ammonoids. It comes from the Vikinghøgda Formation - Sassendalen group (Sassendalen valley - Spitsbergen island - Svalbard archipelago - Norway) Most of the Ammonoids are Svalbardiceras spitzbergensis (Freblod, 1930). Associated on the plate is an unidentified orthoconic Nautiloid (never seen this in the associated litterature), a bivalve and a partial Ammonoid from the Hedenstroemiidae family (at the top-left). Size of the plate is 11,5 X 9,5 cm. I prepared it with my Dremel engraver in about 8 hours.
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Hi all, Originally I thought this was an iron concretion, I still believe it is but was wondering is there is any geologist in the group (or expert) who can point out a more specific type of mineral (siderite? hematite?). Never seen a concretion like this and it was intermingled with Shale packed with plant material and root casts. I want to know if there is any correlation to this mineral and abundance of fossils in the deposits I'm frequenting. Found in Triassic deposit Deep River Formation, NC (Newark Super Group). Regards to all, Alex
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