Itamambuca Group is 4,200 metres (13,800 ft) thick and includes four formations, Ponta Aguda, Marambaia, Iguape and Sepetiba.

Ponta Aguda Formation
The Ponta Aguda Formation is up to 2,200 metres (7,200 ft) thick and consists of conglomerates, coarse to fine-grained sandstones interbedded with siltstones and shales.
The dominant facies are coarse to fine-grained quartzitic sandstones.
They range from reddish to grey, usually with calcite cements.
Intercalated are reddish to light grey claystones and siltstones.
They represent a fluvial to shallow marine environment.

Iguape Formation
The Iguape Formation is 1,103 metres (3,619 ft) 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.

Marambaia Formation
The Marambaia Formation is 261 metres (856 ft) thick and consists of grey shales and light grey marls interbedded with fine-grained turbiditic sandstones.
This formation in places can be found cropping out at sea bottom.
The depositional environment is thought to be talus and open marine basin.
Biostratigraphic data indicate a Tertiary age.

Sepetiba Formation (Pleistocene)
The Sepetiba Formation is the uppermost formation in the Santos Basin.
It has a variable thickness due to the proximal erosion of the uppermost part.
The formation consists of whitish grey fine to coarse grained carbonitic sands.
They are feldspar-rich, glauconitic coquinas consisting of bivalve fragments and foraminifera.
The depositional environment is thought to be coastal.

The stratigraphy following the classifications by Vieira 2007, Kiang Chang 2008 and Contreras 2011 is:
Itamambuca Group is 4,200 metres (13,800 ft) thick and includes four formations, Ponta Aguda, Marambaia, Iguape and Sepetiba.
Ponta Aguda Formation
The Ponta Aguda Formation is up to 2,200 metres (7,200 ft) thick and consists of conglomerates, coarse to fine-grained sandstones interbedded with siltstones and shales. The dominant facies are coarse to fine-grained quartzitic sandstones. They range from reddish to grey, usually with calcite cements. Intercalated are reddish to light grey claystones and siltstones. They represent a fluvial to shallow marine environment.
Iguape Formation
The Iguape Formation is 1,103 metres (3,619 ft) 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.
Marambaia Formation
The Marambaia Formation is 261 metres (856 ft) thick and consists of grey shales and light grey marls interbedded with fine-grained turbiditic sandstones. This formation in places can be found cropping out at sea bottom. The depositional environment is thought to be talus and open marine basin. Biostratigraphic data indicate a Tertiary age.
Sepetiba Formation (Pleistocene)
The Sepetiba Formation is the uppermost formation in the Santos Basin. It has a variable thickness due to the proximal erosion of the uppermost part. The formation consists of whitish grey fine to coarse grained carbonitic sands. They are feldspar-rich, glauconitic coquinas consisting of bivalve fragments and foraminifera. The depositional environment is thought to be coastal.
The stratigraphy following the classifications by Vieira 2007, Kiang Chang 2008 and Contreras 2011 is:
Santos Basin