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Pseudokarstic features are common in clastic sediments at many places of the Bohemian Cretaceous Basin. Occurrences of karstic features which are naturally linked to calcareous sediments are less usual or rather rare. Probably the most extended is the tinyscale Miskovice Karst near Kutna Hora, where macroforms occur. Karstic features of lesser extent in pseudokarstic caves were documented in the Bohemian Paradise and known are as well from the Ticha Orlice and Svitava rivers valleys. Small-sized occurrence of karstic phenomena were found during recent mapping works in the surrounding of Letovice (W Moravia) in the Březinka quarry near Březova n. S. just above the base of the early Turonian Bila Hora Formation. The karstic features are of a speleotheme character and are represented mainly by sinter crusts, tubercular sinters, concentric spheroidal aggregates and straws. The occurrence of concentric aggregates is tied to primary breccia cavities and, on the other hand, another karstic features occur mainly in cavities of corrosive character. Based on such observation we preliminary interpret the genesis of the secondary carbonates in two distinct phases. A crystallization of the concentric aggregates was connected with primary cavities environment, which were probably restricted to exogenous influences. Sinters, straws and other karstic features were generated during a second phase, characterized by influence of normal exogenous karstic processes.

KRASOVÉ JEVY V HORNINÁCH BĚLOHORSKÉHO SOUVRSTVÍ (TURON, ČESKÁ KŘÍDOVÁ PÁNEV) Z LOMU BŘEZINKA U LETOVIC