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.
The rock formations of the state furnish building stones of great value.
The desert was flat, the rock formations and canyons plentiful.
The older formations are nearly all overlaid by deposits of the Quaternary period, which will be described last.
Wherever stratification is observed in these formations in Mississippi, it shows a dip west and south of 20 or 30 ft.