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Showing results for tags 'jurassic'.
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From the album: Fossils from the Plattenkalke of the Altmühl Valley
the "Floating Crinoidd", Comaturella pinnata GOLDFUSS 1886. In the slab limestones you can find many free-swimming crinoids, Saccocoma pectinata. These are small and cover entire strata. Rare are other crinoids, such as this beautiful comatulid "Comaturella pinnata" with a height of over 13 cm. Comaturella lived suspended in the water column and could actively change direction. Complete specimens are rare© fossils worldwide
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the oldest jurassic ammonites you can find in Germany are Psiloceras. Its the earliest Ammonit in the Jurassic ever. A very "boring one", no or less fine ribs, no spikes... But great and not easy to find. This nice slab comes from northwestern Germany, Horn-Bad Meinberg. from a road construction in the 80th of last century© fossils worldwide
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So I split a slab at home and this showed up. Unfortunately compressed and a bit splintered, but negative and positive. Found in Helmsdale, Scotland. Jurassic marine sediment. It looks like a claw, but I also saw see hybodont claspers and squid hooks with this shape. Any ideas?
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From the album: Fossils from the Plattenkalke of the Altmühl Valley
rare and beautyful: Dragonflies. But, not easy to identify... Details in the wing-structure, length of upper to lower wing... this is one we did not find the right name yet. Might be a small Cymatophlebia, but... Size is around 6 cm, Eichstaett edit: we got the name, a rare Nannogomphus, great!© fossils worldwide
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From the album: Fossils from the Plattenkalke of the Altmühl Valley
Fossil jellyfish are rarities. They are soft, consist almost only of water and have no substance that fossilises well. They are very rare in the Plattenkalken, but some have been found over the centuries. Even rarer than jellyfish are medusae. One of these specimens, which is rarer than a pterosaur, is shown here. An almost complete specimen of Hydrocraspedota mayri, about 18 cm in diameter. Found in Pfalzpaint© fossils worldwide
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From the album: Skeleton models
Jurassic China Modified after Epidexypterix from Lomouth© Jan Frost
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Found in Helmsdale, Scotland, ca 3 cm. Jurassic marine sediment. I wonder if this is a fish mandible or maybe reptile as it looks a bit different. Regards, Niels
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Tuataras May Have Originated as Early as 190 Million Years Ago
Oxytropidoceras posted a topic in Fossil News
Tuataras May Have Originated as Early as 190 Million Years Ago Enrico de Lazaro, SciNews, March 4, 2022 The open access paper is: Simões, T.R., Kinney-Broderick, G. and Pierce, S.E., 2022. An exceptionally preserved Sphenodon-like sphenodontian reveals deep time conservation of the tuatara skeleton and ontogeny. Communications biology, 5(1), pp.1-19. Yours, Paul H.- 3 replies
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In 1975 it was possible to dig in middle jurassic sediments in the center of Hannover-Mühlenberg. During the construction of a subway, rocks from the Middle Dogger were tapped. There were many fossils to be found like this very beautiful 8 cm Macrocephalites macrocephalus. Perfect condition© fossils worldwide
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another fine Parkinsonia from Greding, Bajocian. This is the more popular Parkinsonia parkinsoni, this ammonite gives the lithological name "parkinsonia-oolithe". Diameter around 6 cm© fossils worldwide
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Some samples of the Sinemurian stage of the Jurassic period
Svetlana posted a topic in Member Collections
Hello all. After a long break, I would like to show some examples of the Sinemurian Jurassic from my collection. The Sinemurian Stage (Sinemur) is a stratigraphic subsection, the second from the bottom stage of the lower section of the Jurassic system of the Mesozoic era. Covers time from 199.3 ± 0.3 Ma to 190.8 ± 1.0 Ma. As far as I know, these fossils are not very widespread. Arietites (Coroniceras)?.. I am not sure about these ammonites
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I preped this nautilus fossil recently, Wondering if the damage on the shell was caused by predation? And is it Cenoceras sp.? Thanks Information about this: location:Gard,France age: Jurassic
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Just spotted this on the beach, thinking it looks like ichthyosaur shoulder bone or something, don’t want to carry it if it’s just a lump of wood though. What are your thoughts? Already seen a rib in one boulder, a vert in another and collected a piece of possible jaw and another bone. Thanks for looking. IMG_1730.MOV
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Warm day, not muddy now, the Clay was cracked into convenient units for searching. There usually are some pyratised Ammonites, but the preservation of these is beautiful and odd. It might be to do with the amount of rain we've had acting with pyrite - I don't know. I really like the colours and the attached white Serpula worm.
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Rutland, Blisworth Limestone, Jurassic, Bathonian In the same matrix as I extracted the previous tooth I found this minute thing. It has similar preservation and colouration as the tooth, including what looks like enamel. I spotted it glinting. Is this a palatal tooth? I was wondering if it might be Asteracanthus. A really really tiny Asteracanthus.
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Rutland, Blisworth Limestone, Jurassic, Bathonian This is very hard to take a photo of. I think it might be a bone fragment, but I'm not sure what would be this small, and not convinced it isn't something else entirely.
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Hi, I was recently in Normandy, I found this along the cliff between Omaha Beach and Arromanches. I know the rock in the area is Jurassic. I have no idea what that stone could be. It has a maximum thickness of 4 mm. Thank you
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I'm prepping fossils in Oolitic limestone, which is new for me. This fossil is small and delicate, and appears to be a tooth. Should I use hand tools, or what I was thinking was cotton bud, vinegar and a lot of patience? I'm concerned the vinegar would attack the tooth. The white patches are where I scraped the matrix with hand tools, but I wasn't confident this was the best method.
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Rutland, Blisworth Limestone, Jurassic, Bathonian This little fossil looks like it has striations, is it a tooth? I thought it could also be a fragment of shell, although the preservation would be quite different from the other shells I found, and it looks like it has enamel. Scale is in mm. The teeth I was looking for are quite different from this. I'm wary of prepping it yet, I'm not used to prepping limestone and am practicing on larger, less fragile fossils.
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Taxonomy from Fossilworks. From Ebert 2014, p. 39: "Belonostomus sphyraenoides Agassiz, 1844 is known only from the Eichstätt basin. Belonostomus is very rare in the Plattenkalk basin of Eichstätt and as far as I know, all specimens belong to B. sphyraenoides. The Plattenkalk of Eichstätt is dated as eigeltingense β horizon of the Tithonian (Schweigert et al. 2013). Belonostomus sphyraenoides has about 71 vertebrae and 71 lateral line scales." References: Agassiz, L. (1833-1844): Recherches sur les Poissons Fossiles.- 5 vols., 1420 pp. 396pls., with supplements. Petitpierre, Neuchâtel et Soleure. Ebert, Martin (2014) The genus Belonostomus Agassiz, 1834 (Neopterygii, Aspidorhynchiformes) in the late Jurassic of the Solnhofen Archipelago, with a focus on Belonostomus kochii Münster, 1836 from Ettling (Germany). Archaeopteryx 32: 15-43.
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This ammonite is from France,but I don't know what species it is. Please help identify, Thanks!
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Hi all, I bought this Kimmeridgian plesiosaur tooth from the Faringdon sponge gravels a while back. It came identified as Colymbosaurus sp.. At that point, I simply accepted this identification, seeing as the teeth of Colymbosaurus (or, at least, what's suspected of being Colymbosaurus) were already known from the Etches Collection and I didn't really have the means to verify the ascription from online sources. Today, however, The Etches Collection posted a video on Kimmeridgian plesiosaurs on their YouTube-channel, which make it abundantly clear that my specimen doesn't correspond to Colymbosaurus (video referenced below, as is a photographic excerpt of the teeth). The teeth of Colymbosaurus are not only subtrihedral but gracile in shape, they also have very strong striations - much stronger than in my specimen and almost pliosaur-like. The striations on my specimen, on the other hand, are way more similar to those of the Oxford Clay Tricleidus seeleyi, with very fine striations all along the tooth, a round cross-sections and (obviously) without carinae (just to rule out marine crocodile). My question now is: can my tooth be identified as to species or even genus? Could it be that the temporal range of Tricleidus extended into the Kimmeridgian? Might this tooth belong to Kimmerosaurus? Steve mentions in his video that there are more plesiosaurs that remain to be described from the Kimmeridge Clay, so, with that in mind, should I just classify mine as "cf. Crypticlididae indet."? Any ideas and suggestions welcome, but will just also tag @paulgdls and @DE&i.
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Since the summer of 2007, the Jura Museum Eichstätt has maintained a scientific research excavation in the Ettling limestone quarry (Markt Pförring). For a long time, this limestone quarry was considered almost fossil-empty, until private collectors discovered a number of exceptionally well-preserved specimens. The Ettlingen site yielded numerous species previously unknown in the rest of the Plattenkalk region. The fish are very difficult to prepare - the preparation is done under the microscope purely mechanically by scraping only with fine needles and scalpels. The last two pictures are taken under UV light. Recently Macrosemimimus was also found in the somewhat older lithographic limestones of Painten (Upper Kimmeridgian). Taxonomy from Schröder et al. 2012. Differential Diagnosis from Schröder et al. 2012, p. 513: "Medium-sized Macrosemimimus of up to ca. 20 cm standard length (SL), differing from the other species of this genus in the following combination of morphological features: skull bones smooth, devoid of ganoine; scales smooth and with straight posterior border except for a variably developed single posteroventral spine; small extrascapular bones placed lateral to posterior portion of parietals; preoperculum shallow leaving a naked area below the dermopterotic; maxilla with long articular process; moderately tritoral dentition; short longitudinal ridge on ceratohyal. Line drawing of the head from Schröder et al. 2012, p. 516 (scale bar equal 1 cm) References: Schröder, K. M.; López-Arbarello, A.; Ebert, M. (2012). "Macrosemimimus, gen. nov. (Actinopterygii, Semionotiformes), from the Late Jurassic of Germany, England, and France". Journal of Vertebrate Paleontology. 32 (3): 512–529. doi:10.1080/02724634.2012.649626. Ebert, M. & Kölbl-Ebert, M. (2014) Forschungsgrabung Ettling: Grabungsbericht 2014. Archaeopteryx 32:44-49
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Jurassic, Callovian, Oxford Clay, Peterborough Member. I found three this weekend I'm unsure about and would appreciate your thoughts. The first I think might be a decapod carapace.
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Jurassic, Callovian, Oxford Clay, Peterborough Member, Yaxley, Cambridgeshire. The closest thing I can think of to what this looks like is a belemnite, but the overall shape is wrong, and the cross-section is very wrong for belemnites I've found at this site and elsewhere. I haven't completely ruled that out though, and opinions would be appreciated.
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