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Taxonomy and taphonomy of Cenomanian (Upper Cretaceous) nautilids from Annopol, Poland

Machalski M., Wilmsen M.

Acta Geologica Polonica

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2015

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Vol. 65, no. 4

495--506

EN

A nautilid faunule of seven specimens, comprising Eutrephoceras bouchardianum (d’Orbigny, 1840), Cymatoceras deslongchampsianum (d’Orbigny, 1840), and Cymatoceras tourtiae (Schlüter, 1876) is described from a condensed middle Cenomanian interval at Annopol, Poland. C. tourtiae is recorded for the first time in Poland. The studied material consists of reworked phosphatised internal moulds of phragmocones, which may be of early or middle Cenomanian age, given the stratigraphic range of the associated ammonites. The nautilid moulds vary in inferred mode of infilling, and in intensity of abrasion, bioerosion and mineralisation. The sediment entered the phragmocones in two ways: 1) through punctures in the shell, the result of bioerosion or mechanical damage; 2) through siphonal openings by intracameral currents. In contrast to the fossil moulds from the Albian phosphorites of Annopol, which originated via direct precipitation of apatite around and/or inside fossils, the present nautilid moulds seem to have originated through secondary phosphatisation of the initially calcareous moulds. Diversity of taphonomic signatures in nautilid material from the middle Cenomanian interval at Annopol is compatible with the complex, multievent depositional scenario proposed for this level.

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New paleontological data from the Turonian and Coniacian of the Opole Trough (SW Poland)

Niedźwiedzki R., Godlewska A.

Geologia Sudetica

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2005

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Vol. 37

27-33

EN

This report is on the first Micrabaciidae (Micrabacia sp.) solitary corals to have been found in the Upper Cretaceous deposits of the Opole Trough. We also present descriptions of the first nautilids (Cymatoceras sp.; smooth-shelled Nautilidae), regular echinoids (Gauthieria radiata (Sorignet, 1850) and solitary corals (Parasmilia sp.) to have been found in the Lower Coniacian of the Opole region.

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Late Cretaceous nautilids from northern Cantabria, Spain

Wilmsen M.

Acta Geologica Polonica

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2000

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Vol. 50, no. 1

29-43

EN

Nautilids do not occur throughout the Upper Cretaceous succesion in northern Cantabria. Alrhough relatively rare, they preferentially occur in condensed transgressive horizons. Nine species belonging to the genera Angulithes MONTFORT 1808, Eutrephoceras HYATT 1894, and Pseudocenoceras SPATH 1927 are recorded. A. westphalicus (SCHLUTER 1872) and E. cf. justum (BLANFORD 1861) are reported for the first time from the Iberian Peninsula. The diagnosis of A. vascogoticus WIEDEMANN 1960 is emended. The Cenomanian was characterized by a relative abundance of nautilids of the genus Angulithes which display a major radiative event, evolving relatively short-lived species. This development was probably related to the "Cenomanian transgression". Compared to co-occuring ammonite faunas, Angulithes inhabited deeper and more distal environments. A possible transitional form, connecting the two genera Angulithes and Deltocymatoceras KUMMEL 1956 (?Turonian, Coniacian - Santonian), is recorded from the Mid-/Late Cenomanian. The Turonian to Campanian succession is dominated by long-ranging nautilids of the genus Eutrephoceras.