Cerro Yaguarón (cerro relicto de arenisca)

Cerro Yaguarón is an erosional relict: what survived of an older surface as the surrounding land wore away. Its top is flat, like a plateau, and the rock is massive, heavily silicified sandstone, which is why it held up better. It shows ripple marks (traces of currents or wind), desiccation cracks erosion hollows called tafoni, and cracks that resemble a turtle shell.

Its reddish colour comes from hematite, a sign of a continental, oxidizing environment. It belongs to the group of low hills of the Ybytypanemá, together with Ñemby, Lambaré and others. Local tradition links some marks in the rock to the footprints of Saint Thomas.