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AAPG Bulletin
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AAPG Bulletin; Year: 2020; Issue: May DOI: 10.1306/11111917396
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Figure 2. Sequence stratigraphic interpretation of a laterally continuous carbonate outcrop, Early Cretaceous platform in Provence (La Nesque Canyon, southeastern France). Inner-platform sequences with rudists, often capped by exposure surfaces and beach rocks, grade laterally to outer-shelf mudstone deposits with chert and ammonites toward the deeper Vocontian Basin. Opposite system tracts, shallowing-upward and deepening-upward sequences are correlated laterally, which questions the existence of unique relative sea-level curve and system tract in time. Given the uniform subsidence in this case, the differential carbonate production along the sedimentary profile can explain these opposite system tracts (see text for detailed explanations), thus questioning the classical practice of correlating system tracts from distant locations (modified from Léonide et al., 2012). (A) Eastern view of the La Nesque outcrop. (B) Location of the studied outcrop on a Barremian paleogeographical map, southeastern France. (C) High-resolution stratigraphy of the platform-to-basin transition. (D) Theoretical sequence stratigraphic trends in time domain.
Figure 2. Sequence stratigraphic interpretation of a laterally continuous carbonate outcrop, Early Cretaceous platform in Provence (La Nesque Canyon, southeastern France). Inner-platform sequences with rudists, often capped by exposure surfaces and beach rocks, grade laterally to outer-shelf mudstone deposits with chert and ammonites toward the deeper Vocontian Basin. Opposite system tracts, shallowing-upward and deepening-upward sequences are correlated laterally, which questions the existence of unique relative sea-level curve and system tract in time. Given the uniform subsidence in this case, the differential carbonate production along the sedimentary profile can explain these opposite system tracts (see text for detailed explanations), thus questioning the classical practice of correlating system tracts from distant locations (modified from Léonide et al., 2012). (A) Eastern view of the La Nesque outcrop. (B) Location of the studied outcrop on a Barremian paleogeographical map, southeastern France. (C) High-resolution stratigraphy of the platform-to-basin transition. (D) Theoretical sequence stratigraphic trends in time domain.