The waterfalls of the Presidente Figueiredo municipality represent a fascin
ating natural scenery of northeast state of Amazonas, northern Brazil. The
falls, generally less than 10m high, are: developed on siliciclastic rocks
of the Nhamunda (Lower Silurian), and Manacapuru (Upper Silurian - Lower De
vonian) formations. Morphological and structural analysts of these features
indicate that most of them originated through Quaternary neotectonics and
are installed in NE-trending normal fault escarpments. Waterfalls also deve
loped within pseudokarstic features, but an less frequent.
The origin of the Presidente Figueiredo waterfalls probably goes back to th
e Neogene, when the region was submitted to laterization processes associat
ed with a humid climate and a dense rainforest. These conditions favored th
e development of caves in quartzarenites of the Nhamunda Formation. During
the Quaternary, the region was subjected to NE-trending normal faulting whi
ch displaced laterite layers, rivers and streams giving rise to waterfalls.
These climatic and tectonic phenomena promoted intense relief dissection,
as indicated by fault escarpment retreat and cave dismantlement, responsibl
e for the present-day morphologic configuration.