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Clay mineralogy has been successfully used in palaeoclimatic interpretation of Jurassic rocks. In the Mecsek zone (Hungary), the clay mineral assemblages of the Hettangian–Sinemurian fluvial and shallow marine coal-bearing siliciclastic rocks (Gresten facies, Mecsek Coal and Vasas Marl Formations) comprise predominantly illite/smectite (I/S) mixed-layer minerals, illite (ill), and kaolinite (kao)...
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