... We found a great number of wells in this tufa... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...Large patches of these flats are covered with white calcareous tufa resting on perfectly horizontal strata of trap...
David Livingstone 「Missionary Travels and Researches in South Africa」
...Can they be the vestiges of traditions of animals which no longer exist? The fossil bones which lie in the calcareous tufa of this region will yet, we hope, reveal the ancient fauna...
David Livingstone 「Missionary Travels and Researches in South Africa」
...The rivers have each a bed of low water—a simple furrow cut sharply out of the calcareous tufa which lined the channel of the ancient lake—and another of inundation...
David Livingstone 「Missionary Travels and Researches in South Africa」
...It establishes its burrow in a soft tufa, and directs it almost horizontally, hollowing it out in such a way that the axis of the hole makes a very small angle with the soil...
Frédéric Houssay 「The Industries of Animals」
...In red tufa it is copious and good, if it does not run downthrough the fissures and escape...
Vitruvius 「Ten Books on Architecture」
...15 bivouacked on the side of a traphill, among some fine oat-grass growing on calcareous tufa...
A C and F T Gregory 「Journals of Australian Explorations」
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