|BGS image ID: P005962|
Classic locality associated with James Hutton; shows intrusive features at base of Salisbury Craigs sill; teschenite chilled by sediment; sediments broken, twisted and baked by intrusion.
|BGS image ID: P002877|
This is the classic locality, associated with James Hutton, which shows the base of the Salisbury Craigs Sill intruded into Lower Carboniferous sandstones, shales and cementstones of the Ballagan Formation, Inverclyde Group. The sill is chilled (with very fine-grained crystals) against the underlying sandstones which are locally baked and hardened by the heat given out as the sill cooled. The sediments are also broken, twisted and wedged apart by the forceful intrusion of the magma.