Iguape Formation

The Iguape Formation () is a geological formation of the Santos Basin offshore of the Brazilian states of Rio de Janeiro, São Paulo, Paraná and Santa Catarina. The  calcarenite, shale, siltstone, marl and conglomerate formation dates to the Tertiary period and has a maximum thickness of .

Etymology 
The formation is named after Iguape, São Paulo.

Description 
The Iguape Formation is  thick, and consists of bioclastic calcarenites and calcirudites, containing bryozoa, echinoids, corals, foraminifera, fragmented shells, and algae remains. They are interbedded with grey-greenish clays, siltstones, marls and variegated grey fine-to-medium grained conglomerates. These facies are interbedded with and change laterally to the Marambaia Formation. The depositional environment is thought to be a marine carbonate platform, influenced by the arrival of alluvial clastics in the most proximal areas. Biostratigraphic data from planktonic foraminifera, calcareous nanofossils and palynomorphs indicate a Tertiary age. Carbonate production rates of the formation have been estimated at  per million years.

See also 

 Campos Basin

References

Bibliography 
 
 
 

Category:Geologic formations of Brazil
Formations
Category:Neogene Brazil
Category:Paleogene Brazil
Category:Neogene System of South America
Category:Paleogene System of South America
Category:Limestone formations
Category:Sandstone formations
Category:Siltstone formations
Category:Shale formations
Category:Marl formations
Category:Conglomerate formations
Category:Alluvial deposits
Category:Shallow marine deposits
Formations
Formations
Formations
Formations
Category:Tupi–Guarani languages