- phytoherm
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A calcareous freshwater reef, generally built up from autochthonous petrification of bryophytes, funghi, algae and cyanobacteria.
Wikipedia foundation.
Wikipedia foundation.
Tufa — Not to be confused with tuff, a porous volcanic rock. This article is about the geological formation. For the historic Chinese name, see Southern Liang. Tufa columns at Mono Lake, California Tufa is a variety of limestone, formed by the… … Wikipedia