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Since thirty years, the development and the use of sequence<br>stratigraphy concepts have cause a growing interest for<br>unconformities as bounding surfaces of stratigraphic units.<br>Only a few studies focalized on the comprehension of<br>diagenetic and sedimentary processes, and timing of formation<br>of sedimentary discontinuities. However, these processes<br>represent the only "sedimentary" record of environmental<br>changes, during the formation of the discontinuity.