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Updated: May 20, 2025
Over this a later stratum was deposited called tufa granolare, consisting of a similar mechanical conglomerate of scoriæ, ashes, and other volcanic products, but more porous and friable in texture. It is in this last formation, which is so soft that it can be easily hollowed out, and yet so solid that it does not crumble, that the Catacombs are invariably found.
Three different kinds of stone compose the basis of the Roman Campagna; the tufa litoide, as hard and durable as granite, used extensively for building purposes; the tufa granolare, which is consistent enough to retain the form given to it by excavators, but it is useless as building material, and lastly the Pozzuolana, largely employed in the making of Roman cement.
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