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Any idea?


brus

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Hi,i think this is an oyster attached on something....is this somethimg a fossil too or?found in Croatia and the piece is big about 20cm.tnx.

P_20170208_160944_SRES.jpg

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Hmm.  :headscratch:

Any chance of pictures from the other sides? 

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I think there's not too much recognisable for a correct fossil ID. Possibly there are some rudist remains in the Hardly weathered matrix which could be Terra Rossa.

 

"The Upper Albian–Lower Campanian megasequence is characterised with very variable facies successions. As the result of Laramian movements which started in the late Senonian, the uplifted carbonate rocks were exposed to weathering and a network of deeply karstified and intensely eroded landforms opened along extension joints(Marincˇic´ and Maticˇec´, 1991). Due to subaerial exposure, bauxites of dominantly boehmite composition were formed, which fill a tectonically controlled relief of shallow-water carbonates of Albian to Senonian in age (Sˇinkovec et al., 1994). The Paleocene–Eocene unit which unconformably overlies paleorelief developed on carbonate rocks is variable, both in a lateral and vertical sense. It consists of carbonate and clastic rocks and can, in general, be divided into Liburnian deposits, Foraminifera limestones, Transitional beds and Flysch. The most widespread sediments in this unit are flysch deposits which are characterised by an alternation of marl and carbonate sandstone beds.
Since that time the surface has been affected by karst processes and weathering which has led to the development of both surficial and underground features.
Different types of sediments, polygenetic paleosols and soils have been formed.
The oldest Quaternary sediments were discovered in Sˇandalja cave near Pula and are represented by red breccia with fauna remains of Early Pleistocene age (Malez, 1981).
Climatic and biotic factors have changed during Late Tertiary and Quaternary but the pedoenvironment on hard carbonate rocks of Jurassic–Cretaceous–Paleogene carbonate plain of southern and western Istria generally remained suitable for rubification(after Boero and Schwertmann, 1989). As a result of this process, paleosols formed on hard and permeable limestone and dolomite have characteristic reddish color.
Terra rossa is found on the Jurassic–Cretaceous–Paleogene carbonate plain of southern and western Istria (Figs. 1 and 2). It fills cracks and sinkholes, and forms a discontinuous surface layer up to 2.5 m thick. Thick(up to 14 m) accumulations of terra rossa like material are found in karst depressions in the form of pedo-sedimentary colluvial complexes. (...) " 

 

- as it is nicely described in G. Durn. 1999. Mineralogical and geochemical indicators of the polygenetic nature of terra rossa in Istria, Croatia. Geoderma 91.125–150

 

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