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Between Meinha-tólli and Madéra-dubba, obsidian, pumice, clinkstone, and fresh-water limestone containing shells of Melania, were strewed about Excellent soil is found in all these situations, the low grounds being overflowed at some seasons, and, as in all volcanic countries, producing much vegetation.

Clinkstone or phonolite is a greenish-gray, compact, felspathic rock, somewhat slaty or schistose, and weathers with a white crust.

Some varieties are slaty, and are frequently mistaken for clinkstone, which they closely resemble.

Clinkstone, called also phonolite, a felspathic rock of the trap family, usually fissile.

The volcanic products of Mezen have been erupted from one central orifice of vast size, and consist mainly of extensive sheets of "clinkstone," a variety of trachytic lava, which have taken courses mainly towards the north-west and south-east.