Editing Runcorn (section)

===Geology===
[[File:Runcorn Hill 3.jpg|thumb|Runcorn Hill, showing cutting through sandstone]]
The Runcorn area drains into the River Mersey to the north and the River Weaver to the south.

The [[bedrock]] geology of the River Mersey and the northern and western fringes of Runcorn is [[Sherwood Sandstone Group|Sherwood Sandstone]] and pebbly sandstone. To the south there is a transition to siltstone, sandstone and predominantly [[Mercia Mudstone Group|Mercia Mudstone]]. The primary sedimentary rock is [[New Red Sandstone]].<ref name="Halton Landscape Character Assessment 2008" />

The [[Superficial deposits|superficial geology]] is varied with pockets of sand and [[diamicton]] along the lower-lying land adjacent to the Mersey and through Runcorn. Sand and gravel becomes common on the southern fringes of the town and elsewhere there are small pockets of clay, silt, sand and gravel.<ref name="Halton Landscape Character Assessment 2008" />