tufa
noun
a porous limestone formed from calcium carbonate deposited by springs or the like.
tufaceous
-
a word derived from
tufa.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
At Jilmeca and some other points along the day's route the rock over which we passed was a white tufaceous material loaded with streaks of black flint.
From In Indian Mexico (1908) by Frederick Starr
Here numerous proofs are seen of submarine eruptions, by which the argillaceous and sandy strata were invaded and cut through, and tufaceous breccias formed.
From The Student's Elements of Geology by Sir Charles Lyell
The secondary formation is represented by a fine limestone, in some places almost fit for the purposes of lithography, and a coarse gypsum often of a tufaceous nature.
From Personal Narrative of a Pilgrimage to Al-Madinah & Meccah — Volume 2 by Sir Richard Francis Burton
It seems to have been embedded in some reddish tufaceous matter; and may have been transported either by the aborigines or by natural means.
From Volcanic Islands by Charles Darwin
The tufaceous stratum on which this feldspathic lava rests is much hardened, stained purple, and has a spherico-concretionary structure; it here contains a good many pebbles of claystone porphyry.
From Geological Observations on South America by Charles Darwin
