The rocks comprising this important area were laid down during the later Carboniferous.

The rocks comprising the bird's chest are piled eight to ten feet high, while the wings, tail, and head rise lower.

The oldest rocks in the quarry comprise late Ordovician siltstones.

The sedimentary rocks comprising this structure dip outward at 10 -20 .

It has the potential to contain platinum group elements, but the age of the mafic-ultramafic volcanic rocks comprising the nickel deposits are not well known.

The primary rock comprising Slesse is grey diorite from the Batholith.

However, the strontium-bearing volcanic rocks comprising Bowie Seamount also contain lead.

These rocks comprise the Swaziland system.

The rocks comprise complex channel-fill sandstones (including sedimentary bar-forms and current direction indicators).

Igneous rocks such as pyrite (FeS) comprised the original pool of sulfur on earth.