| Almost as soon as work began above ground, work also began on driving a tunnel northwards towards the sandstone face of Worsley Delph. |
| The sandstone abraders were small, the largest being 8.23 cm in length and the smaller 3.94 cm. |
| In 1998 it recommenced extraction of sandstone from a quarry at Stancliffe in Derbyshire. |
| The upper 300 m of the Haengefjeldet Formation is made up of 3-10 m thick well-sorted, normally graded, matrix-supported sandstones and wackes. |
| Among the 30 different types of stone recognized are varieties of diorite, granite, bedded tuff, sandstones, limestones, and tufa. |
| The most resistant rocks are quartzite and quartz-rich sandstones, and tough fine-grained rocks such as slate. |
