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TGS has announced completion of its Jaan 3D seismic survey collating over 28,000km2 of data in the MSGBC Basin offshore Senegal, Gambia and Guinea-Bissau. Jaan (the Wolof word for snake) is a long strip of seismic coverage consisting of more than 12,000km2 of new data plus recently reprocessed surveys designed to map the Cretaceous Palaeo shelf-edge trend in an area that has seen a number of recent discoveries.