This work purposed the geospeleological mapping of the Piriás Cave, located in Matozinhos - MG, Brazil and the interpretation of its evolution. The cave shows a linear, plan-horizontal meandering form, the horizontal projection reaching 670m. The sections are predominantly irregular and rarely show rounded forms, characteristic of development under hydrostatic conditions. The following speleothems are present: cascades, curtains, minigours, coraloids, stalactites, anemolites and dogtooth calcite. The cave was generated at the contact, represented by a detachment fault, of carbonatic rocks of the Upper Proterozoic Sete Lagoas Formation and the Archean granitic-gnaissic basement. The evolution of the cave occurred in three phases, the phreatic, the epiphreatic and the vadose. Its development, related to tectonic, stratigraphic and hydrologic factors, is still going on.
geospeleology; Pirias cave; speleogenesis
