The rock formations of the state furnish building stones of great value.
The geological formations thus exposed show that the plateaus are composed of a base of eruptive material, overlaid by enormous deposits of reddish sandstones, conglomerates and quartzites, exposed in parts to a depth of 2000 feet.
It is one of the most rapid and economical which can be employed in soft formations, but where hard rock is encountered it is almost useless.
Along the whole northern rim of Bosnia, as also in the fluvial and Karst valleys (poljes), are found diluvial and alluvial formations, interrupted at one place by an isolated granite layer.
(Lefebvre), all new formations since the outbreak of the war, followed some marches in the rear.