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karst. phenomenon. Grottoes of Castellana. Cretaceous period. Deposit of mud and sand. Water produced by rainfall percolated in the porous limestone , and dissolved it . . T H I S I S T H E G R A V E. THIS IS THE TIPICAL BREACH ON THE TOP OF THE GRAVE.
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karst phenomenon
Water producedbyrainfallpercolated in the porouslimestone, and dissolvedit.
T H I S I S T H E G R A V E