This British Geological Survey (BGS) marine geophysical and sampling survey took place in June 2004 in the Clyde estuary from Greenock to the Erskine Bridge aboard the Griffon Hovercraft. The purpose was to gather data which could be used for Estuarine Contaminant analysis. Seabed samples were collected with a manual sediment coring system ((1.5m x 6cm polycarbonate tubes, fitted with basket catcher) and trowel for surface sediment sampling). Subsurface seismic data were gathered using a surface tow boomer (C-Boom low voltage boomer and power supply unit. BGS Coda DA200 Data Acquisition system, hydrophone and thermal printer). Most of the data were recorded digitally, but paper records were generated also. Technical details of the survey are contained in Survey report 04/GH/02.