limestones

A extinct genus of Branchiopoda, very common in Silurian limestones.

A peculiar structure found in the Archaean limestones of Canada and other regions

a name given in England and Europe to a series of marine limestones underlying the Oolite

A cement having the color of the Portland stone of England, made by calcining an artificial mixture of carbonate of lime and clay, or sometimes certain natural limestones or chalky clays