Calcareous infiltration

Anonyme,  « Wonders of Anti-Geology » The American Church Monthly,  New York, avril 1858, p. 258.

Some of the limestones strata are called « indusial,»  being entirely made up of the cases, or indusiae, of caddis-worms, which have been cemented by calcareous infiltration into a stone so hard as to be used for building.