The young inventor pointed toward the huge volcanic formation.

The mountains have many sharp cliffs and rises, as well as several volcanic formations.

Little Mountain is a volcanic formation which was at one time mined for its granitic basalts.

The south side of the cliffs has a rare volcanic formation called the Rock Roses.

From its size and configuration, Dyannis guessed it must be some volcanic formation.

Or maybe he'd been distracted by the newest volcanic formation on his cheek.

La Palma's geography is a result of the volcanic formation of the island.

The area is covered by the Deccan Traps, a large, 68 million years old, volcanic formation.

The quarry exposed a large volcanic formation between 200 and 250 million years old.

Within the vast area of cinder fields are other extinct volcanic formations.