Serra dos Órgãos is the local name given to a section of the
Serra do Mar
mountain chain which in this region is heading inland, due to the presence of the
Guanabara - Graben.
The granitic southwestern rockface of Pedra do Sino, with 2.263 m the highest elevation of the national park
is considered one of the most difficult climbing routes in
Brazil.
The spectacular rock formations in the eastern part of Serra dos Órgãos which from the distance look like huge organ pipes of a church,
represent the visible granite - gneiss outcrops which are underlain by an enormous (100 km) intrusive body (batholith) that have resisted the erosional forces.
Radiometric dating indicates that this pluton must have been created by the slow subterranean solidification (crystallization) of magma melts about 570 million years ago
during the consolidation of the Atlantic Shield
in the course of the
NeoproterozoicBrasiliano Event.
Serra dos Órgãos National Park and surrounding areas provide excellent
hiking & trekking opportunities.
Of particular ecological interest are the so - called
campos de altitude
which occur above 1.800 m
and contain many endemic species.