Stratigraphic architecture in fluvial-deltaic systems are responsive to eustasy and tectonics. To assess the role of each in stratigraphic heterogeneity, Rasmussen examines a complex Miocene incised valley fill system at the margin of the North Sea. Study of outcrops and boreholes, and integration with seismic data, reveal a marine-to-fluvial succession, with a shift from braided to meandering fluvial style, interpreted to form a compound incised valley fill. The results reveal that the valley fill is a result of both eustatic change and tectonics, and that tectonics results in a different morphology and distinct distribution of lithology than occurs in most eustasy-controlled incised valleys.
Development of an incised-valley fill under the influence of tectonism and glacio-eustatic sea-level change: valley morphology, fluvial style, and lithology by Erik S. Rasmussen