Atlas Peri-Tethys, Paleogeographical maps. Explanatory notes by Dercourt J., Gaetani M., Vrielynck B., Barrier E.,

By Dercourt J., Gaetani M., Vrielynck B., Barrier E., Biju-Duval B., Brunet M.F., Cadet J.P., Crasquin S., Sandulescu M.

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A second area of coarse-grained sediments might be traced along a semioval belt, from Orenburg to Astrakhan. Tatarian sediments are represented here by red-coloured sandstones, silts, argillites. To the east of this belt conglomerate lenses may also occur. Locally horizons of the grey-coloured sediments with numerous stromatolite bodies are present. Moving to the west, the coarse sediments grades into red-coloured siltstone and claystone. The large area occupied by the sediments of Tatarian age, located between Orenburg and Astrakhan, can be named as the Volgo-Urals fluvial plain.

1978), the Anatolian - Hellenic - Dinaric basins (DEMIRTASLI,1990; PAPANIKOLAU & SIDERIS,1990; RAMOVS, 1990), as well as 1997; KRAINER & the Carnic Alps basin (VAI& VENTURINI, DAVYDOV,1998), and the Transdanubian - Bijkk basin presented platform deposits from Moscovian to Gzhelian (Fig. 1). The facies are alternations of limestone and sandstone in Elbourz and conglomerate, sandstone, claystone and limestone in Carnic Alps and other areas. Faunal and floral relations were very strong with the Russian platform and the Tethyan regions (VAI, 1994, 1997).

A Permian lowspreading-rate emplacement of this oceanic crust is preferred here also because of the lacking magneticanomaly-related banding, which could be expected for the long-lasting Permo-Carboniferous reversed polarity (Kiaman) superchron. This dating is consistent with the fact that the Early to Middle Permian is the interval when the most common and widespread occurrence of platform deepening, drowning and collapsing is documented in the areas surrounding the lonian and Eastern Mediterranean Seas.

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