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Showing results for tags 'kimmeridgian'.
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Questions on a undescribed Late Jurassic Tyrannosaur taxon from Tanzania
Joseph Fossil posted a topic in Questions & Answers
Image of Selected Kimmeridgian-Tithonian (Late Jurassic) dinosaur faunas: Morrison (USA), Lourinhã (Portugal), Tendaguru (Tanzania), and Guará/Batoví (Brazil and Uruguay). Map modified from Blakey (2006). Image Credit: Dr. Heitor Francischini, 2017. https://www.researchgate.net/figure/Selected-Kimmeridgian-Tithonian-Late-Jurassic-dinosaur-faunas-Morrison-USA-Lourinh_fig5_318348596 Recently I came across a very interesting record of a possible Jurassic Tyrannosauroid genera from the theropod database. It lists the specimen as coming from the Kimmeridgian-Titonian Jurassic age (Dating 154.8±0.8-145.0 Million Years ago) sections of the Tendaguru formation in the Lindi Region of Southeastern Tanzania, Africa. The details of the specimen are listed on the database as the following: undescribed possible tyrannosauroid (Naish, DML 2000) Late Kimmeridgian-Tithonian, Late Jurassic Tendaguru Formation, Tanzania Material- (NHMUK coll.) premaxillary tooth (~10 mm) Description- D-shaped; one side serrated, the other not. Reference- Naish, DML 2000. https://web.archive.org/web/20191009075255/http://dml.cmnh.org/2000Apr/msg00440.html https://theropoddatabase.github.io/Tyrannosauroidea.html#Atroxicariuseversor It's detailed by Paleontologist Darren Naish (who helped complete the monograph part of the formal description of Eotyrannus in 2022) the specimen is a premaxillary, d-shaped, theropod tooth about 10mm. In height and is part of the Natural History Museum in London, U.K. (NHMUK) paleontological collections. https://web.archive.org/web/20191009075255/http://dml.cmnh.org/2000Apr/msg00440.html https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9271276/ If this does represent a new Tyrannosauroid genera, it would even be the first to possibly come from around Africa. http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=55391 https://www.researchgate.net/publication/257651210_First_description_of_theropod_remains_from_the_Middle_Jurassic_Bathonian_of_Madagascar What I'm wondering is if anyone else has heard about this potential new Tyrannosauroid genera, this particular NHMUK fossil tooth specimen, and how valid could the taxonomic designation be with this taxon?
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From the album: Invertebrates
Silicisphinctes russi Schweigert, 1998 Late Jurassic Kimmeridgian Nusplingen Baden-Württemberg Germany -
Hello (again) everyone! Here is another bone from the Kimmeridgian of the Boulonnais region (North of France). It measures just over 20 cm (8 inch) in lenght. At first, I thought it was a thick piece of rib from a bony fish (doesn’t match the cut shape of plesio, ichthyo or croc rib). Then, while preparing it, this « back » part seemed different to the rest of the bone being thin. It almost looks as if there are muscle attachments. Obviously, I am hoping that this might be a piece of jaw. For now I only did carefull manual prep on it. I am waiting for the paraloid to dry to give it a quick vinegar bath and try removing some more matrix with an air scribe. Has anyone got any clue? Thank you very much!
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Hello everyone! I recently went back to the Boulonnais region of North of France and found these two mystery bone blocks (right next to eachother). The first block immediately caught my attention with the rock surrounding the bone having a very strange shape, which I’ve never seen before. Granted we can’t see much with the algae and it will need some prep to have a full ID. Maybe someone already recognizes the strange shaped matrice around the bone? And here’s the second bone block that I found near the first one: Both blocks are very heavy and measure 30+cm! Oh yes, and I also found a lot of associated rib pieces in the surrounding boulders. Impossible to remove them without risking breaking them though. The bone conservation is really bad there. The layers present in this region are Kimmeridgian and Tithonian. We find a lot of ichthyosaur, plesiosaur, marine crocodile, bony fish there and sometimes (almost never) turtle, pterosaurs and dinosaurs. Also, if someone has experience with removing algae on this kind of bone conservation, I don’t want to try bleach and damage the already thin/damaged bones… Thank you!
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Originally it was assumed that this species was only found in Ettlingen, Bavaria. In the meantime, further specimens from other locations are known (Ebert, 2021). Derivation of genus name (Arratia 2016, p. 34): 'Ebertichthys is given in recognition of the dedicated work that Martin Ebert (Eichstätt) has done recently at Ettling, recovering fossil fishes and preparing them with the suffix – ichthys (Greek) for fish. M. Ebert collected the specimens described herein.' Diagnosis by Arratia, 2016, p 33 '(based on a unique combination of characters; uniquely derived features among primitive teleosts are identified with an asterisk [*]): Small teleosts of about 90mm maximum length with dorsal-fin origin placed posterior to pelvic origin and equidistant to pelvic and anal fins [*]. Large head, about 33% of standard length [*]. Large eye, about 35% of head length [*]. Large, heavily ossified supraorbital bone, anteroventrally expanded. Large, elongate antorbital [*]. Infraorbital 1 long, narrow, and slightly broader anteriorly. Infraorbital 2 long and narrow, forming most of the ventral orbital margin [*]. Infraorbital 3relatively small, leaving most of quadrate exposed [*]. Elongate ectopterygoid with a small tooth patch. Entopterygoid with small conical teeth. triangular, narrow preopercle with ventral and posterior margins forming an angle of about 90_ [*]. Dorsal arm of preopercle almost reaching lateral margin of skull roof. Preopercle with an expanded, rounded flange at the level of infraorbital 3 [*]. Preopercular canal with elongate, narrow sensory tubules in ventral and dorsal arms. A massive, well-ossified cleithrum with dorsal arm shorter than ventral one [*]. First anal pterygiophore long, broadly expanded, and almost rectangular in shape [*]. Neural spine of preural centrum 1 shorter than neural spine of preural centrum 2. Ural centrum 1C2 bearing two neural arches with short spines. Eight or nine hypurals. First three anterior uroneurals longer than posterior uroneurals 4 to 6. Uroneural 1 extending anteriorly and reaching preural centrum 2. One “urodermal” present. Body covered with large cycloid scales.' Identified by M. Ebert, Staatliche Naturwissenschaftliche Sammlungen Bayerns. References: Arratia, G. (2016). New remarkable Late Jurassic teleosts from southern Germany: Ascalaboidae n. fam., its content, morphology, and phylogenetic relationships. Foss. Rec., 19, 31–59, 2016. doi:10.5194/fr-19-31-2016 Ebert, Martin (2021). Teleostei der Plattenkalke des Solnhofen-Archipels – Ein Bestimmungsschlüssel. Archaeopteryx, 37: 30 – 55.
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I wondered if anyone might be kind enough to guide me with these finds? I feel a little foolish, but I’m wondering if I’ve finally found some examples of fossil bone? (I’m studying hard, but still very green at all this!) No 1 is quite tiny, only 2.5cm (1 inch) long. From the Helmsdale Boulder Beds in Scotland, which are Kimmeridgian, and are marine in origin (but there’s also land material there, such as abundant wood - its thought there was a fault scarp just off shore that collected material). I just found it amongst shingle, somehow. No 2 is still in matrix, about 2.5 x 7cm (1 x 3 inches) and from the Kintradwell Boulder Beds, Scotland. Also Kimmeridgian and very similar to Helmsdale. I saw a forum user’s post of a piece of ichthyosaur rostrum and thought it maybe had some similar features, with size, texture and the almond-shaped tiny ‘divots’ (where blood vessels would’ve gone into the bone?). Many thanks for any help received!
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Hello everyone! Here I am with another mystery bone from the boulonnais (Wimereux) region - North of France. The layers here are kimmeridgian and titonian (late Jurassic). I have a few pieces that I’ve collected over the course of 3 days all at the same spot. I managed to match the first three pieces, with two pieces that I already glued together since I was 100% sure of how they fit together. The first two pieces together: Then, I have this third piece that also match but I didn’t find the perfect angle to glue them yet: And together, they would look like this: Total size would be 15 cm broad and 20+cm long (that’s 6 inch broad and 8 inch long). Now I was thinking about part of (distal end) a plesiosaur propodial. But I’ve found a couple plesiosaur and pliosaur propodial from there and they are way flatter at the end. Also, they are mostly the same shape on both sides. Whereas here the « upper part » (the two pieces already glued together) are chunky on one side and flatter on the other side. Has anyone got an idea? Thank you very much!
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Hello everyone! Here’s another mystery (to me at least) from the Kimmeridgian (?) of Wimereux, North of France. It doesn’t seem to be bone. Is it a shell, plant, crab or something else? Thank you for your help!
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From the album: Vertebrates
Mesturus verrucosus WAGNER, 1863 Late Jurassic Tithonian Painten Rygol quarry Bavaria Germany Length 8.5cm Quite rare juvenile fish. -
From the album: Russian Upper Kimmeridgian ammonites
Tatarstan rep. Tetyushi, Au. mutabilis zone. D 2 cm, pyrite -
From the album: Russian Upper Kimmeridgian ammonites
Ulyanovsk Oblast, Undory, eudoxus zone, pyrite-
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- ammonite
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A new pliosaur from the Kimmeridgian deposits at Kimmedige has just been revealed to the world! Rumours have been going around about it for some time, but now the source of the rumours has been revealed, and it's spectacular! Belonging to the genus Pliosaurus, to judge from it's age and tooth morphology, it's one of the best preserved - if not best preserved - skull of its kind! https://www.bbc.com/news/science-environment-67650247?fbclid=IwAR3ukvNzGPSxBdhBp3Z3zrIEJZEbDki1ezYhSrCaLjpYVUIsc_nOGPexuDs
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- david attenborough
- etches collection
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From the album: Russian Lower Kimmeridgian ammonites
Vladimir, Lower Kimmeridgian, bauhini zone, phosphorite/aragonite -
From the album: Late Jurassic plesiosaurs from the Volga
Ulyanovsk Oblast, Undory, Kimmeridgian, pyritized -
From the album: Russian Lower Kimmeridgian ammonites
Vladimir, Lower Kimmeridgian, bauhini zone, phosphorite -
From the album: Russian Lower Kimmeridgian ammonites
Vladimir, Lower Kimmeridgian, bauhini zone, phosphorite -
From the album: Russian Upper Kimmeridgian ammonites
Syzran, Late Kimmeridgian, Autissiodorensis zone, phosphorite, 5,5 cm- 1 comment
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- ammonite
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Hi all! This time I'd like to inform you on a short, but diverse trip to several Volga river locations. The finds were not too impressive unlike the weather, endless fields and various outcrops. First I went to the southern part of Ulyavovsk Volgian shore: (These are Hauterivian concretions. They are roundish in form) These are Volgian Volgian boulders Beige rocks are Volgian, overlaying black clay is Hauterivian. Volgian section ends nearby (to the left) as the corresponding rocky layers gradually go underground
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- kimmeridgian
- permian
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From the album: Late Jurassic crustaceans of European Russia
Syzran, Upper Kimmeridgian, Autissiodorensis zone, phosphorite+calcite-
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- crustacean
- kimmeridgian
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From the album: Late Jurassic crustaceans of European Russia
Undory, Ulyanovsk Oblast, Kimmeridgian-Volgian boundary, phosphorite-
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- crustacean
- kimmeridgian
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From the album: Late Jurassic crustaceans of European Russia
Undory, Ulyanovsk Oblast, Kimmeridgian, pyrite-
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From the album: Late Jurassic crustaceans of European Russia
Undory, Ulyanovsk Oblast, Kimmeridgian-Volgian boundary, phosphorite-
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- crustacean
- kimmeridgian
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Hi all! As winter is getting nearer I tried to catch the last glimpses of summer and went for a one-day trip to the Volga river, taking advantage of unusually low water level and a good weather forecast combination. And I wasn't disappointed with scenery and finds, which I'd like to share with you. Last warm days of November before snow cover:
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- jurassic
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Aspidorhynchus acutirostris (Blainville, 1818)
oilshale posted a gallery image in Member Collections
From the album: Vertebrates
Aspidorhynchus acutirostris (Blainville, 1818) Late Jurassic Kimmeridgian (late) - Tithonian (early) Painten Formation Painten Bavaria Germany This fish lies in an extremely soft rock and was very difficult to prepare. At the slightest touch (even with a small brush) scales could come off. Unfortunately the top of the skull is slightly dislocated.- 1 comment
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- aspidorhynchus
- jurassic
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Hi all! Today I'll show you a site which is quite similar to the subject of the Frozen Fossils topic, but somewhat opposite of the latter, as it's only accessible in summer (end of July- beginning of September). It's situated in the historical city of Vladimir on the Klyazma river. The banks are overgrown with vegetation, no movement whatsoever on the river and very few people visible. Occasional ducks and herons, fish splashing nearby.The bridge is the only reminder of civilization. The river bed is surprisingly formed of solid clay you can confidently walk on. The age of this clay is Lower Kimmeridgian (mostly the 1st bauhini/baylei zone which is pretty rare in European Russia)
