Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
The origin of red Barrandian limestones of the Praha Formation: Contribution to the discussion (Lower Devonian, Czech Republic)
Abstract
The main objective of this contribution is to evaluate the impact of a regressional Lochkovian-Pragian event on the stratigraphie and spatial distribution of red limestones. This case study was based on the locality "Na Cikánce - Ve Skále Quarry". The regressional event corresponded to low sea level state – LST and was related with the exposition of weathered carbonate platform with lateritic regolith, which served as a source of Fe oxides for limestone colouring (see Skoček and Kukal 1998). Lateritic materials was a colouring substance for the Pragian Slivenec Limestone facies starting from the lower Pragian boundary and, moreover, also for Reporyje Limestone facies during subsequent sea-level rise (TST). During maximum basin flooding (HST) grey limestones of Dvorce-Prokop facies deposited, because carbonate platform was already completely flooded and did not supply any lateritic detritus. The Koněprusy reef area is specific from this viewpoint and washing of red pigment into deeper marginal areas of erinoidal talus can be supposed.
