Sequence stratigraphy uses regionally
correlative surfaces to subdivide a succession of strata; in nonmarine strata,
marine flooding units can provide important tie points. In this study, Ielpi documents several
marine bands in late Miocene lacustrine-paralic deposits of the Northern
Apennines and illustrates their use in basin and sedimentologic analysis. The data reveal that low-frequency sequences bounded
by major marine incursions are regionally correlative and respond to regional
high-amplitude base level fluctuations; in contrast, nested high-frequency
sequences are noncorrelative and respond to local low-amplitude base level
fluctuations. The results are interpreted to underscore the role of
differential subsidence in the generation of asymmetrical sequence
architectures and the alternation between hydrologically balanced and
underfilled phases in high-accommodation and low-topography settings.
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