The suite of mountain formations contains many different foliated granitoids plutons, displaying chiefly crustal Stype affinities -  Pão de Açúcar Granite, Corcovado Granite and Cosme Velho Granite.

Recent geocrhonological studies, using a SHRIMP (Sensitive High Resolution Ion Microprobe) systematic found there to be a crystallization age of ca 560 Ma - This age acts as an international geological reference for the final amalgamation of the Gondwanaland Supercontinent, during the Brasiliano / Pan-African Orogenic Cycle termination.