Skelmersdale is built on Carboniferous rock: Coal Measures mudstone, siltstone and sandstone
under most of the town, Millstone Grit under Digmoor, and over all of it a deep, continuous
blanket of Devensian glacial till. British Geological Survey mapping returns the same soil
parent material at every point sampled across the town, a deep till of loam to clayey loam
with low and variable carbonate. Six kilometres west, Ormskirk sits on Sherwood Sandstone
with a sand-to-loam parent material. Skelmersdale is the one town in this corner of West
Lancashire that is not on the sand, and it holds water where the plain lets it go.
The town was designated on 9 October 1961, the first of the Mark Two new towns and the first
in the North West, and the corporation that built it was wound up in March 1985. What it left
is a housing stock of one era: Radburn layouts on the older estates, where the house fronts a
shared green and the parking court sits behind it, and boundary planting of much the same age
running across whole neighbourhoods. The ground under it rises about seventy metres, from the
Tawd valley floor at Birch Green to the Ashurst side in the east, with the river running
through the middle and culverted in places.