Adjective modifier

• calcareous: They include fantastic rock formations, karst cliffs and caves and terraces of calcareous tufa.

• volcanic: There are those binding stones and consolidating the material with burnt lime and volcanic tufa.

Modifies a noun

• formation: Current tufa formation at Nash Brook appears to reflect the interaction of hydrological and biological controls.

• rock: The adventurous can still spend a night in one of the cave dwellings hewn from the tufa rock.

• deposition: Water was sampled at the fall, where tufa deposition on twigs and leaves is evident.

• deposit: In Trench 4 the tufa deposits were 40m wide starting 18m from the north end of the trench.

• stone: Trulli are small, picturesque rural houses ( also built of tufa stone ) some dating from the 15th century.

• waterfall: She is traditionally supposed to have resided at the tufa waterfall still known as Janet's Foss.