Abstract
Coniacian rudist-buildups have been discovered in the Dernaïa-Tamesmida area (west central Tunisia). They are sedimentologically studied in detail in this paper. Reefs sensu stricto are made up of rudists (Hippuritidae and Radiolitidae) and they show a height:lateral extension ratio of about 1:50. The fore-reef is composed of southwest progradang pelletoid sandwaves, whilst hemipelagic micrite has been deposited in the distal talus. The back-reef lagoons (NE side) include green algae and annelid, miliolid, ostracod and gastropod biotopes. Perilagoonal oolitic bars may border these environments. These reefs evolved in a shallow, relatively open environment. They correspond to barrier-reef complexes which developed at the margin of a generally shallow carbonate ramp. In terms of the sequence stratigraphy, they characterise late low sea levels and especially the high sea levels of the uppermost Turonien-Coniacian depositional sequence.
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