Stratigraphy of tide-dominated estuaries

Abstract

Tide-dominated estuaries have received less attention than wave-dominated -estuaries due mainly to the fact that they are less common coastal systems. Consequently, the data available on the sedimentary infill of tide-dominated estuaries are limited. The present chapter describes several modern (Holocene) examples for which seismic, sediment core and 14C age data are available, allowing reconstruction of sediment fills. Some ancient examples are also given. The distribution and preservation of some key features such as systems tracts and ravinement surfaces are discussed in light of the different examples, as well as the controlling factors of infilling. Only a few features and factors can finally be assigned specifically to tide-dominated estuary infills. However, two points must be emphasized: (1) wave-built bodies are common features preserved within tide-dominated estuary infills; and (2) the potential for preservation of estuarine sedimentary bodies is primarily controlled by tidal accommodation, defined by the depth of the main tidal channel belt.