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  1. RuMert

    A bucket of Bronnitsy ammonites

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Rybaki. D 10 cm. Mostly pyritized
  2. RuMert

    "Spirit of Rybaki"

    From the album: Russian Upper Oxfordian ammonites

    Amoeboceras tuberculatoalternans, a rare thick species, with 2 common specimens. Moscow Oblast, Bronnitsy, Rybaki. Serratum ammonite zone. 2 cm, pyrite
  3. RuMert

    Amoeboceras koldeweyense

    From the album: Russian Upper Oxfordian ammonites

    Uncommon smooth shell species. Moscow Oblast, Bronnitsy, Rybaki. Serratum ammonite zone. 3 cm, pyrite
  4. RuMert

    Peresphinctidae ammonite

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Rybaki. Serratum ammonite zone. 1,8 cm, pyrite
  5. oilshale

    Archaeomaene tenuis (Woodward 1895)

    Taxonomy from Lynne Bean 2021. Archaeomaene tenuis can be easily distinguished from the much more common Cavenderichthys talbragarensis by the more posterior dorsal fin. Diagnosis for Archaeomaene tenuis from Bean 2021 (modified from Woodward 1895): “ Same as family with the following additional characteristics. The supraorbital sensory canal has branched (ramified) tubules [*]. The dorsal fin is placed opposite to the anal fin. Pelvic, dorsal and anal fins are without fringing fulcra [*]. There are six uroneurals; the epaxial margin of the caudal fin has a few long basal fulcra and long f
  6. Marco90

    Gryphaea dilatata

    From the album: My collection in progress

    Gryphaea dilatata Sowerby, 1818 Location: Villers-sur-Mer, Normandy, France Age: 163-157 Mya (Oxfordian, Upper Jurassic) Measurements: 7x7x7 cm Kingdom: Animalia Phylum: Mollusca Subphylum: Conchifera Class: Bivalvia Subclass: Pteriomorpha Order: Ostreida Family: Gryphaeidae
  7. Marco90

    Cleoniceras sp.

    From the album: My collection in progress

    Cleoniceras sp. Parona & Bonnarelli 1895 Location: Atsimo-Andrefana, Madagascar Age: 157 - 155 Mya (Oxfordian, Upper Jurassic) Measurements: 4,5 cm (diameter) Kingdom: Animalia Phylum: Mollusca Subphylum: Conchifera Class: Cephalopoda Subclass: Ammonoidea Order: Ammonitida Suborder: Ammonitina Family: Hoplitidae The ammonite is iridescent. In some parts is visible the elaborate ammonitic suture pattern.
  8. fifbrindacier

    Zigzagceratinae ?

    Hi everybody, i need help to identify that Oxfordian Perisphinctidae i found yesterday in a quarry of Charente, South-West of France. I think it could be a Zigzagceratinae indosphinctes, but that's only a supposition. I also thought it could be a choffatia, but i don't know if they can be that big (an important part of it is lacking) as you can see on the second pic with my friend's hand as scale. The scale on the first pic is in inches. Thank you for your help.
  9. Hello everyone. I offer interesting gastropods with calcite crystals - perhaps someone will be interested I have a lot of them. Pseudomorphoses of calcite after gastropod shells of the genus Nerinea from Upper Jurassic limestones of the Oxfordian stage (Izyum Formation J2-3iz); 163,5 mln years. Ukraine, Donetsk region. I'm interested in everything - I invite you to private messages Have a nice day VID_20220122_135535.mp4 VID_20220122_135732.mp4
  10. RuMert

    Ammonite quarry

    Hi all! This is a small trip report from a quarry by the town of Mikhaylov, Ryzan Oblast, situated in 200 km from Moscow. The place is very well known among the public interested in fossils, especially ammonite collectors. There are 4 quarries in a tight group, operated by different companies. Mikhaylov quarry is the most famous of them. The experience is very similar to that of other Callovian - Oxfordian quarries (in my previous reports), but ammonites suddenly take the place of gastropods! Pretty exciting, isn't it? Unfortunately there are not many spoil piles as Jurassic overburd
  11. Taxonomy according to Hao et al 2009. Hao et al. 2009, p223: “Revised diagnosis: Body length: 6-13 mm: wing length 8.2-15.6 mm Sc ending at wing margin approximately the same as R4+5 forking into R4 and R5; R1 long, r-r at one -third of its length before the end of R1; R2+3 shorter than R3; R4+5 short, R4+5 fork six times longer than dR4+5. M1 smoothly curved, m-m joining close to M1+2 bifurcations. M3+4 with a little bend at m-m. CuA slightly sigmoid beyond m-cu; A1 strongly curved to wing margin in two-thirds of its length.” Wing line drawing from Hao et al. 2009, p.225:
  12. Last sunday October 24th I decided to visit the old Andil clay quarry at Liesberg in Switzerland, just over two hours driving from where I live, to see what fossils I might find there. Now a nature reserve where collecting is tolerated as long as the natural parts are not disturbed, the deposits at this quarry, mined for cement production between 1934 and 1980, date to the Upper Callovian and Lower to Middle Oxfordian (source). It is thus stratigraphically - though not petrologically - comparable to the geology of Vaches Noires in Normandy, with which I'm much more familiar, albeit with the in
  13. RuMert

    alternoides&serratum

    From the album: Russian Upper Oxfordian ammonites

    Difference between Amoeboceras alternoides (alternoides zone, below) and serratum (serratum zone, above). The latter is younger. Moscow Oblast, Bronnitsy, Markovo/Rybaki
  14. RuMert

    Small Perisphinctidae ammonite

    From the album: Russian Upper Oxfordian ammonites

    Amoeboceras alternoides, Moscow Oblast, Bronnitsy, Markovo, alternoides zone. Fully pyritized
  15. RuMert

    Amoeboceras ventral view

    From the album: Russian Upper Oxfordian ammonites

    Amoeboceras alternoides, Moscow Oblast, Bronnitsy, Markovo, alternoides zone
  16. RuMert

    Rybaki imprints in snow

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Rybaki, serratum zone
  17. RuMert

    Amoeboceras in situ

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Markovo, alternoides zone
  18. RuMert

    Contest Amoeboceras in the field

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Markovo, alternoides zone
  19. RuMert

    Contest Amoeboceras

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Markovo, alternoides zone
  20. RuMert

    Amoeboceras sp.

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Markovo, alternoides zone
  21. RuMert

    Amoeboceras alternoides

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Markovo, alternoides zone
  22. RuMert

    Imrints

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Rybaki, serratum zone
  23. RuMert

    Amoeboceras alternoides

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Markovo, alternoides zone
  24. RuMert

    Amoeboceras serratum

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Rybaki
  25. RuMert

    Amoeboceras serratum

    From the album: Russian Upper Oxfordian ammonites

    Moscow Oblast, Bronnitsy, Rybaki, serratum zone. On matrix with imprints of outer whorls. Pyrite
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