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Iberopora bodeuri GRANIER & BERTHOU 2002 (incertae sedis) from the Plassen Formation (Kimmeridgian–Berriasian) of the Tethyan Realm

F. Schlagintweit

Sažetak

Iberopora bodeuri GRANIER & BERTHOU 2002, formerly known as “crust problematicum” (SCHMID, 1996) is described from the Plassen Formation (Kimmeridgian–Berriasian) of the Northern Calcareous Alps (NCA). Here, it occurs either as an incrustation on corals/stromatoporoids or it forms nodular masses (“solenoporoid morphotype”). It is typically found in the fore-reef facies of the platform margin, and (upper) slope deposits where autochthonous dasycladales are absent. Water turbulence appears to control the morphological development of Iberopora. Thus, flat crusts appear in less agitated settings. The crusts are almost always accompanied by calcareous sponges/sclerosponges and abundant micro-encrusters, mostly Koskinobullina socialis CHERCHI & SCHROEDER and “Tubiphytes” morronensis CRESCENTI. The stratigraphic range of Iberopora known to date is Oxfordian–Berriasian. In addition to the Northern Calcareous Alps, it has been reported from the epicontinental area of NW-Germany, the northern margin of the Penninic and Tethyan ocean (Slovakia, Switzerland, Spain, Poland, Portugal) and the southern Tethyan domain (Greece, Romania, Yugoslavia). Until other morphological elements (e.g. reproductive organs or protoconch) are found, its systematic position remains uncertain. Currently, it is considered questionably to be an ancestral rhodophyceae or acervulinid-like foraminifera.

Ključne riječi

Incertae sedis; Upper Jurassic; Lower Cretaceous; Plassen Formation; Northern Calcareous Alps; Austria

Hrčak ID:

3683

URI

https://hrcak.srce.hr/3683

Datum izdavanja:

30.6.2004.

Posjeta: 2.066 *