Salisbury Crags outcrop. Drone footage of the cliffs of Salisbury Crags, in Edinburgh, Scotland. This outcrop (a dolerite sill) is known as Hutton's Section. It is an important geological site, named after the geologist James Hutton, who studied the area in the mid-18th century. His research into the geology of the area led to him to develop theories of rock formation and geological time. A slab of sedimentary rock has been torn away during the injection of the magma that now forms the Salisbury Crags. The remaining broken ends of the strata were rotated upwards as magma tried to force its way along a bedding plane. The dolerite sill is some 25 million years younger than the older rocks around it.