English Dictionary

tufa

noun

Calcareous lime deposited by precipitation from a body of water, such as a hot spring. / (petrology) A variety of volcanic rock, tuff.

The tufa formations in the national park are breathtaking.

意味（1）

Calcareous lime deposited by precipitation from a body of water, such as a hot spring.

B.J. Szabo presented the results of a survey of the tufa mounds that border Pyramid Lake indicating that uranium-series methods can be used to approximate the ages of such tufa deposits. In the Pyramid Lake Basin, tufas less than 50,000 years old contain large quantities of excess thorium, and the error in age estimates made using uranium-series methods is not small enough to confirm results from ¹⁴C determinations.

意味（2）

(petrology) A variety of volcanic rock, tuff.

This again is followed by a bed of stony tufa of a reddish colour, containing fragments of a spongy lava, amphigone, pyroxene, mica, and common lava; and, like the former, traversed by argillaceous veins.