The described exotic rock block (60×80×13–15 cm) was found at 290 m depth in a lower–middle Badenian gypsum layer the Koshava mine, NW Bulgaria, near Danube River. It is greyish-black, granular, with layered structure and layers composed of ?-quartz rosettes covered organic matter (kerogen-like type high contents Ge, Mo B), wood relicts chalcedony replacement, porous lenses compact accumulation...

Aptian carbonate rocks of Santos Basin in the Brazilian southeastern continental margin show a highly heterogeneous reservoir quality conditioned by many controlling factors. This study presents quantitative approach based on an integrated petrographic, mineralogical, and geochemical dataset Barra Velha Formation (BVF) to understand spatial temporal distribution depositional diagenetic aspects ...

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