Sentence Examples with the word tuf

Pompeii was merely covered with a bed of lighter substances, cinders, small stones and ashes, which fell in a dry state, while at Herculaneum the same substances, being drenched with water, hardened into a sort of tuf a, which in places is 65 ft.

There are few craters on the loftier heights, but on the coasts there are several groups of small cones with craters, some of lava, others of tuf a.