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Showing results for tags 'oxfordian'.
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From the album: Late Jurassic gastropods of European Russia
Moscow Oblast, Peski quarry, Middle Oxfordian. Rare-
- gastropod
- gerasimovcyclus
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From the album: Late Jurassic gastropods of European Russia
Moscow Oblast, Peski quarry, Middle Oxfordian -
From the album: Late Jurassic gastropods of European Russia
Moscow Oblast, Bronnitsy, Upper Oxfordian, alternoides zone. Numerous -
From the album: Prae's Collection (REMPC)
REMPC-C0040 Perisphinctes indogermanus Jurassic, Oxfordian Near Sakaraha Tulear Province, Madagascar-
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From the album: Late Jurassic bivalves of European Russia
Three most common Oxfordian bivalves: Nuculana, Trautscholdia, Grammatodon. Moscow Oblast, Peski quarry, Middle Oxfordian -
Peski typical find, a Trautscholdia bivalve shell
RuMert posted a gallery image in Member Collections
From the album: Late Jurassic bivalves of European Russia
Trautscholdia/ Middle Oxfordian, Moscow Oblast, Peski -
From the album: Late Jurassic bivalves of European Russia
Grammatodon, Trautscholdia, Nuculana, Trigonopis, etc/ Middle Oxfordian, Moscow Oblast, Peski quarry -
From the album: Late Jurassic bivalves of European Russia
Small bivalves from Timonino quarry, Moscow Oblast, Oxfordian -
From the album: Late Jurassic bivalves of European Russia
Grypheas from Syzran, Samara Oblast, Oxfordian amid other finds -
From the album: Late Jurassic bivalves of European Russia
Big Gryphea from Syzran, Samara Oblast, Oxfordian -
From the album: Late Jurassic bivalves of European Russia
Moscow Oblast, Peski quarry, Middle Oxfordian -
From the album: Late Jurassic bivalves of European Russia
Moscow Oblast, Peski quarry, Middle Oxfordian -
From the album: Late Jurassic bivalves of European Russia
Upper Oxfordian, Moscow Oblast, Broniitsy -
From the album: Late Jurassic bivalves of European Russia
Upper Oxfordian, Moscow Oblast, Broniitsy -
From the album: Late Jurassic bivalves of European Russia
Upper Oxfordian, Moscow Oblast, Broniitsy -
From the album: Late Jurassic bivalves of European Russia
Upper Oxfordian, Moscow Oblast, Broniitsy -
From the album: Late Jurassic brachiopods of European Russia
Moscow Oblast, Bronnitsy, Late Oxfordian, Am. serratum zone- 1 comment
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- brachiopod
- lingula
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From the album: Moscow region Late Jurassic vertebrates
Synechodus sp.? 4 mm, Moscow Oblast, Bronnitsy, Late Oxfordian - Amoeboceras serratum zone-
- oxfordian
- shark tooth
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Hi all! This is another report from Oxfordian quarries in the vicinity of Moscow. Previous 1 (Peski) Previous 2 (Timonino) Peski again. If you read my fossil sites overview, you know that Peski quarry is a unique site where you could find lots of Carboniferous fossils, Middle Jurassic dinosaurs, calcitic Callovian ammonites and very good Oxfordian gastropods. The latter are the most numerous and easier to search for. My trip took place in April and was mostly a success with a good variety of finds
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- 4
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- cyclocrinus
- gastropod
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Hi all! You know I visit my favorite Volga river site (Ulyanovsk Oblast) more or less often, but this time I decided to give a try to another well-known Jurassic-Cretaceous site on the Volga river, located in the nearby Samara Oblast (city of Syzran). It's famous for its iridescent ammonites as well as marine reptile finds. I hoped to discover a real alternative to the Ulyanovsk site particularly as the conditions are very similar: surface collecting on river bank. Here the Ulyanovsk site is to the north, Syzran to the south. The latter is home to two distinct locations: in the city itself (Oxfordian-Volgian, 2km) and by the Kashpir village (to the south): Volgian to Barremian, 4 km.
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- ammonite
- craspedites
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Hi everyone, I got offered this pair of marine reptile teeth as those of ichthyosaurs, but am having a hard time making my mind up about their identification. I'd therefore like to ask for your opinions. The teeth were found during works around Nancy back in 2004, and, based on other ichthyosaur finds from the region, likely dates the Toarcian stage of the Early Jurassic (though, from what I can tell, Oxfordian marine deposits are also accessible in the area). This makes them roughly the same age as material from the Posidonia Shale/Holzmaden and Whitby, but slightly younger than that of the Lyme Bay area. The above photograph is the only one I have, with the seller being on fieldwork and unable to provide much further information for the next couple of weeks. Although we can safely eliminate marine crocodile as contenders for the original owners of these teeth, and I think they are too big to have belonged to fish, I'm undecided on whether these are just highly worn ichthyosaur teeth or plesiosaur teeth. There's something to be said for both. The tall, slender shape of the teeth and their slight curvature, for instance, would seem to fit plesiosaurian teeth, as would, most significantly, the round root of the bigger tooth. In that case, however, the smaller tooth does seem a bit stubby, and the traces of ornamentation along the midsection of the larger tooth surprisingly equidistantly spaced. Generally, the morphology of the smaller tooth to me suggests ichthyosaur rather than plesiosaur. But if that were the case, I'd expect either enamel folds on the crowns themselves, folds on the root, or both (even when ichthyosaur teeth have smooth enamel, I find they still have folds on their roots). I'd also expect the root to be more polygonal in shape, somewhere in the range of triangular to (rounded) square. This is not the case. Now there seems to be some ornamentation midway up the larger specimen which equidistant spacing correlates well with patterns of the folds found on ichthyosaur teeth, thus may indicate the tooth is ophthalmosaurid and therefore Oxfordian rather than Torcian in age. The below image I drew up makes the comparison: As you can see, the match is less then ideal, as the top part of the French tooth is completely devoid of enamel folds, whereas in an ophthalmosaurid tooth the plicidentine folds actually taper out until the enamel is clear. @belemniten, however, posted images of a couple of his ichthyosaur teeth from Holzmaden, one of which appears to show a similar pattern as visible in the middle of the French tooth under consideration here, including what appears to be a round root: However, when looking at other images of the same tooth, it turns out that the root does have folds, as you'd expect from ichthyosaur teeth: Similarly, the below tooth seems to have a superficially similar appearance to the French tooth for the hairline cracking of the enamel, and the fact that enamel appears to be missing from the crown immediately above the root proper (which, again, exhibits folds, however). Still, if the "smooth round root" on the French tooth would've been covered by enamel as well, this would make for a very tall tooth as far as ichthyosaurs go. As illustrated by the specimen below (source), though, ichthyosaur teeth do occasionally have round roots: Moreover, the folds on the root don't always run the full height of it (image source): Lastly, as the specimen below demonstrates (source), the entire root can look completely smooth, presumably from wear: As such, I'm wondering whether the French tooth specimen might not be a very worn ichthyosaur tooth, with its parts being composed as such: This doesn't particularly make too much sense to me either, as the part of the root with folds is rather long and has a very abrupt transition into the remainder of the root. In addition, it raises the question of how the tooth would've gotten so worn. Though I understand there are fluvially exposed sites around Nancy, could this have caused the wear we're seeing. Or would the wear rather be peridepositional? So, I guess I can summarize my questions as: Do these look like plesiosaur or ichthyosaur teeth? If plesiosaurian, what would the equidistant striations on the midsection of the tooth be? If ichthyosaurian, do these teeth look more ophthalmosaurid or pre-ophthalmosaur? How might the wear I think I'm seeing be explained? Thanks for the help! cc @paulgdls @PointyKnight @DE&i @Welsh Wizard @RuMert @FF7_Yuffie
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Hello everybody! In continuation of the Frozen Fossils and Frozen Fossils II topics this report covers fossil hunting in real winter, with excavating fossils from under the snow (@JamieLynn might be interested). The trips took place this week when we had a thaw with temperatures raising to +1-2 Celsius after a long period of frost (so that digging became possible). This time I visited the same site as in FF2, which is MUCH poorer than the one covered in FF1, but MIGHT yield more diverse fossils (which was unfortunately not the case).
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- ammonite
- amoeboceras
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Hi all! Today I'd like to introduce you to another place to hunt for small Oxfordian fossils, a quarry by the village of Timonino, located to the east of Moscow. The finds and hunting method are pretty much the same as in the previous site. Basically, surface collecting small Oxfordian fossils, usually gastropods, is a distinct sort of fossil hunting in the Moscow region. To the east of the city lies a sort of "Oxfordian belt" with similar geologic setting, finds and hunting conditions. Here's a map of the Oxfordian sites in the region. The quarries in operation are marked in blue, they usually extract older layers, thus removing Oxfordian clay and stacking it in spoil piles. Fossils can then be collected from the piles' surface. Due to specific conditions, ammonites are not preserved at all, but bivalves and gastropods retain a very good quality. People usually search for the latter. Most such quarries are located around the city of Kolomna, including Peski quarry I've already presented. Shchyolkovo quarry (in brown) is out of operation and completely flooded, but there are a couple of tiny clay patches with mostly belemnites. A group of sites marked in orange are located on the Moskva river bank and accessible only in winter (focus of the Frozen fossils topic), the hunting season is about to resume. They are also Oxfordian with the same set of gastropods, but also well-preserved ammonites everybody looks for. Timonino quarry is an isolated site with conditions similar to Kolomna's. Unlike the latter, it strangely extracts white Bathonian clay instead of limestone. The quarry came in operation just a few years ago and ultimately became popular among fossil collectors. Going forward I can say its reputation is greatly exaggerated.
- 22 replies
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- cyclocrinus
- gastropod
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Trigonia reticulata Agassiz, 1840 Oxfordien Villers sur Mer Normandy
nala posted a gallery image in Member Collections
From the album: Trigonia from France
Trigonia reticulata Agassiz, 1840 Oxfordien Villers sur Mer Normandy -
Zittelina orbis Oxfordian Niort Deux Sèvres France
nala posted a gallery image in Member Collections
From the album: Brachiopodes, Shells, corals, sponges......
Zittelina orbis Oxfordian Niort Deux Sèvres France- 1 comment
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