Example Sentences

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In addition to the reddish or brownish argillaceous matrix it contains fresh or decomposed crystals of volcanic minerals, such as felspar, augite, hornblende, olivine and pumiceous or palagonitic rocks.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" by Various

For hundreds of miles of coast there is one great deposit composed of shells—a white pumiceous stone like chalk, including gypsum and infusoria.

From The World's Greatest Books — Volume 19 — Travel and Adventure by Hammerton, John Alexander, Sir

Portions, therefore, of this lava were either thrown 383 out by explosions, or torn off by the waves, during the deposition of the pumiceous strata beneath the sea.

From Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology by Lyell, Charles, Sir

Professor Ehrenberg has examined this mudstone for me: he finds in it three already known microscopic organisms, enveloped in a fine-grained pumiceous tuff, which I shall have immediately to describe in detail.

From Geological Observations on South America by Darwin, Charles

These beds are covered by others of a peculiar soft white stone, including much gypsum, and resembling chalk, but really of a pumiceous nature.

From The Voyage of the Beagle by Darwin, Charles