puzzolana

Or perhaps the frequent importation of terra puzzolana, which is in common use to make cement, and which when landed may have been mistaken for earth, may have given rise to the assertion.

Travels in Nubia 2004

Beneath a cirro-cumulus -- or mackerel sky -- again that day, wonderfully beautiful because of its perfection of design, we were gradually rising over the domed elevation we had previously observed, upon which we found masses of tiny pebbles -- what are known to geologists by the Italian name of "puzzolana" or _scoriæ_ reduced to a granular condition.

Across Unknown South America Arnold Henry Savage Landor 1894

In the island of Teneriffe, strata of tufa, puzzolana, and clay, separate the range of basaltic hills from the currents of recent lithoid lava, and from the eruptions of the present volcano.

Travels to the Equinoctial Regions of America 1851

He hopes to be more fortunate than those who have preceded him; he wishes to form a precise idea of the geological relations which the volcano and the neighbouring mountains bear to each other: but how often is he disappointed, when, on the limits of the primitive soil, enormous banks of tufa and puzzolana render every observation on the position and stratification impossible!

Travels to the Equinoctial Regions of America 1851

This last formation resembles the tufas of Pausilippo, and the strata of puzzolana, which I found in the valley of Quito, at the foot of the volcano of Pichincha.

Travels to the Equinoctial Regions of America 1851

This last formation resembles the tufas of Pausilippo, and the strata of puzzolana, which I found in the valley of Quito, at the foot of the volcano of

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 Alexander von Humboldt 1814

In the island of Teneriffe, strata of tufa, puzzolana, and clay, separate the range of basaltic hills from the currents of recent lithoid lava, and from the eruptions of the present volcano.

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 Alexander von Humboldt 1814

He hopes to be more fortunate than those who have preceded him; he wishes to form a precise idea of the geological relations which the volcano and the neighbouring mountains bear to each other: but how often is he disappointed, when, on the limits of the primitive soil, enormous banks of tufa and puzzolana render every observation on the position and stratification impossible!

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 Alexander von Humboldt 1814