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The Seismic Facies of a Delta Onlapping an Offshore Island: Fraser River Delta, British Columbia
The Fraser River delta, in southwestern British Columbia, is actively prograding into the Strait of Georgia. During the Holocene period an island, now the peninsula of Point Roberts, was incorporated into the Fraser’s deltaic plain. To investigate the subsurface structure and stratigraphy of this area of the delta, a high resolution shallow seismic reflection survey was carried out during the summer of 1987. Four seismic facies were identified and were interpreted as topset, foreset, tidal channel and slope failure deposits. A basal succession of pre-deltaic sediments, which forms the lower boundary of the seismic section, extends into Point Roberts Peninsula.
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