Background. Ammonite products are increasingly gaining in popularity. Ammonites characterised by a variety of colour shades, shapes and sizes, making them suitable for manufacturing wide range souvenir jewellery products. Russia enjoys significant resources ammonites interior jewellery-ornamental quality; however, these materials remain insufficiently studied from the mineralogical point view. ...

We apply the carbonate clumped isotope thermometer (D47) to macrofossils from the Baculites compressus ( 73.5 Ma) and the Hoploscaphites nebrascensis ( 67 Ma) ammonite zones of the Western Interior Seaway (WIS) of North America, and nearby coeval terrestrial and open marine environments. The carbonate clumped isotope thermometer is based on a single-phase isotope exchange equilibrium that promo...

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New collecting of ammonites and inoceramid bivalves from Cretaceous-Tertiary boundary sections exposed al Sopelana Zumaya, Spain, Hendaye Bidart (Biarritz), France, has led to better understanding molluscan biostratigraphy in each these coastal exposures. Ali can be lithologically correlated. At all the sections, have now been found within last meter Cretaceous. Also, disappear near base A . ma...

The ammonite assemblage of the planula Biohorizon (Early Kimmeridgian, Planula Zone) is studied in detail, mainly based on bed-by-bed collected specimens from Wohlgeschichtete-Kalke Formation Plettenberg Quarry near Balingen (western Swabian Alb) and some additional coeval beds former Schneider at Spielberg am Hahnenkamm (southwestern Franconian Alb). Within Upper Jurassic Southern Germany, one...