Abstract
Detailed study of a grid of high resolution (HR) seismic reflection profiles shows the general sedimentary structure and lateral plus vertical variability of seismic facies in a part of the inner continental shelf north of the Ebro Delta (northeast Spain). In the whole succession, we identify nine seismic units with chronostratigraphic significance and eight seismic facies with lithological and environmental significance. The most important controlling factors responsible for sedimentary structure and seismic facies have been Quaternary sea level chages and the fluctuating influence of the Ebro River input. Our study questions, moreover, the validity of the concept of the “seismic facies unit” in cases, such as this, where marked lateral variability in seismic facies makes their lateral limits unidentifiable, thereby completely removing any chronostratigraphic value to these units.
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