Formation of the Frasassi Caves

Sub-horizontal conduits

They have a medium inclination esteemed in 3 grades and present ,on its sides, deep etchings which, besides indicating the quantity of water that crossed them, reveal the solvent power of water on limestone. Sulphureous water penetrated in the paleo-rooms and , through the sub-horizontal conduits, entered the outside hydrography. These conduits are very important because allow the exchange of sulphureous water and a continuous reaction.

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