Abstract
The paper summarizes the results of lithological and especially malacological research of the system of tufa deposits in the Koda Valley near Srbsko (Czech Republic, Central Bohemia, Czech Karst), and describes their evolution in time and space. The unique network of ten depositional sequences provided rich material of mollusc shells.
Such detailed analysis of molluscan assemblages within the whole system of slope and valley-bottom tufa deposit has been performed for the first time in the Czech Republic. Moreover, some sites of this network provide some of the most complete successions in the Czech Republic, and can be further used as standard sites of postglacial molluscan succession (excavated pits S 8, S 9).
This study also confirms that basal layers of the tufa accumulation at the Koda karst resurgence are Late Glacial in age. Tufa deposits at other sites are younger.
The early onset of tufa accumulation at Koda could have been caused by an elevated water temperature of the spring.