Abstract
The Messinian carbonate platform of the Djebel Murdjadjo (western Algeria) is composed of six sedimentary units arranged in generally aggradational—progradational sequences commencing at the major Tortono—Messinian transgression and terminating at the onset of the “Salinity Crisis”. Palinspastic reconstruction, combined with microfacies analysis, has allowed recognition of inner platform to outer platform environments and provides a new interpretation for platform building with respect to relative sea-level (accommodation space) changes. Following the deposition of the bioclastic limestones of the first transgressive unit, the upper red-algae limestones, a reef-complex and a part of the “Terminal Complex” were successively deposited during stillstands. These three episodes were each separated by decametre-amplitude rises in relative sea-level (accommodation space). No major sea-level drop appears to have been associated with the deposition of Messinian evaporites.
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