 One big river system found by 3D seismic survey, undertaken by the Birmingham "North Sea Palaeolandscapes Project," was the "Shotton River", which drained the south-east part of the Dogger Bank hill area into the east end of the Outer Silver Pit lake.It is named after Birmingham geologist Frederick William Shotton.As ice melted at the end of the last glacial period of the current ice age, sea levels rose and the land began to tilt in an isostatic adjustment as the huge weight of ice lessened.