The gypsum and marl that build the characteristic hills of the Tajuña plain were stored in the southeast of Madrid by evaporation of large amounts of water about five million years ago, during the Miocene, on top of the thick layer of limestone and dolomite that was formed during the Alpine orogeny, when the main peninsular reliefs were created, about 80 million years ago.
Curiosities of the environment are on the side of the gray ledges and ledges that seem to be about to crumble. The brittle layers of plaster form giant bolts, chimneys, vaults, passageways and rock bridges. The geological nature of the Tajuña Valley is a gallery of suggestive sculptures in an unstable and strange territory.