Limestone alternates between soft, chalky, and marly and hard to very hard, recrystallized. Bauxite is found in pockets (upper 30 ft. in the Pepper well at Phantillands, 19 ft. at Friendship, 60 ft. at Cheapside). Bauxite is also present in Bay Filly-Mountainside, Newell, and other places.

Limestone in driller's logs is defined as "rich in solution vugs", or "limestone with crevices", or "very porous", or "well developed skeletal vug permeability", or "large solution cavities" or "solution channels". In some wells, sand is described between limestone layers at depth. It appears to be cavity in-fill, pointing at karstification. Typical well is at Fullerswood.

While the secondary porosity (due to solutional processes and/or fractures) is well developed in many wells, primary porosity is normally low or at best moderate.

Stratigraphically, the limestone underlying the Black River Basin (the Newport Formation of the White Limestone Group) extends to the depth greater than 4000-5000 ft.

White limestone is normally overlain at the surface by clay and marl; for exampple, the Pepper 1 well shows about 110 feet of clay and marl at the surface. In many wells, especially at ALPART's wells at Pepper and Nain, the complete lithological determination is missing. Instead, the entire drilled sequence is described by one single word - limestone.