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Ammonites

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Ammonites are extinct marine cephalopods with planispiral shells that appeared on Earth in the Devonian and went extinct at the end of the Cretaceous – early Paleogene, due to the K/T extinction. 

References
Baldacci, F., Elter, P., Giannini, E., Giglia, G., Lazzarotto, A., Nardi, R., & Tongiorgi, M. (1967). Nuove osservazioni sul problema della Falda Toscana e sulla interpretazione dei flysch arenacei tipo “Macigno” dell’Appennino settentrionale. Mem. Soc. Geol. It6(2), 213-244.
Cecca, F., Fourcade, E., & Azéma, J. (1992). The disappearance of the “Ammonitico Rosso”. Palaeogeography, Palaeoclimatology, Palaeoecology99(1-2), 55-70.
Jenkyns, H. C. (1974). Origin of red nodular limestones (Ammonitico Rosso, Knollenkalke) in the Mediterranean Jurassic: a diagenetic model. Pelagic sediments: on land and under the sea1, 249-271.

        

See also
Rosso Ammonitico – wikipedia
Rosso Ammonitico under the microscope – Alexstrekeisen.it

it_IT Italiano
Detrital and Authigenic Minerals
Textures
Sedimentary Structures
Fossils
Sedimentary Rocks

 

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