The Camburi Group is up to 6,100 metres (20,000 ft) thick and includes three formations, Florianópolis, Guarujá and Itanhaém.

Florianópolis Formation
The Florianópolis Formation is 343 metres (1,125 ft) thick in the type oil well, and consists of reddish, fine to coarse-grained sandstones with a clay matrix, reddish micaceous shales and siltstones.
These clastic units are thought to represent alluvial environments distributed along the western Brazilian basin margin, along the Santos Hinge Line.
These alluvial environments were gradational towards the east, with the shallow marine carbonates of the Guarujá Formation, and further to the open basin with the siltstones of the Itanhaém Formation.
Biostratigraphical data and its relations with the Guarujá Formation point towards an Albian age.

Guarujá Formation
The Guarujá Formation is 832 metres (2,730 ft) thick and consists of oolitic calcarenites, which laterally grade to greyish ochre and brownish grey calcilutites and grey marls.
These facies are interbedded with the alluvial clastics of the Florianópolis Formation.
The Guarujá name is restricted to the lowest limestone intercalation, previously named Lower Guarujá by Ojeda and Ahranha in Pereira and Feijó (1994).
The microfacies indicate a tidal flat to shallow lagoon and open carbonate platform depositional environment.
The age based on planktonic foraminifera and pollen is Early Albian.

Itanhaém Formation
The Itanhaém Formation is 517 metres (1,696 ft) thick and consists of dark grey shales, silts and light grey marls, ochre-brown calcisilts and subordinated sandstones.
These facies change laterally into the coarse clastics of the Florianópolis Formation.
Facies analysis indicates a marine environment ranging from sub-littoral (inner neritic) and more rarely to pelagic (outer bathyal) conditions.
The age based on planktonic foraminifera and pollen is Early Albian.
The Camburi Group is up to 6,100 metres (20,000 ft) thick and includes three formations, Florianópolis, Guarujá and Itanhaém.
Florianópolis Formation
The Florianópolis Formation is 343 metres (1,125 ft) thick in the type oil well, and consists of reddish, fine to coarse-grained sandstones with a clay matrix, reddish micaceous shales and siltstones. These clastic units are thought to represent alluvial environments distributed along the western Brazilian basin margin, along the Santos Hinge Line. These alluvial environments were gradational towards the east, with the shallow marine carbonates of the Guarujá Formation, and further to the open basin with the siltstones of the Itanhaém Formation. Biostratigraphical data and its relations with the Guarujá Formation point towards an Albian age.
Guarujá Formation
The Guarujá Formation is 832 metres (2,730 ft) thick and consists of oolitic calcarenites, which laterally grade to greyish ochre and brownish grey calcilutites and grey marls. These facies are interbedded with the alluvial clastics of the Florianópolis Formation. The Guarujá name is restricted to the lowest limestone intercalation, previously named Lower Guarujá by Ojeda and Ahranha in Pereira and Feijó (1994). The microfacies indicate a tidal flat to shallow lagoon and open carbonate platform depositional environment. The age based on planktonic foraminifera and pollen is Early Albian.
Itanhaém Formation
The Itanhaém Formation is 517 metres (1,696 ft) thick and consists of dark grey shales, silts and light grey marls, ochre-brown calcisilts and subordinated sandstones. These facies change laterally into the coarse clastics of the Florianópolis Formation. Facies analysis indicates a marine environment ranging from sub-littoral (inner neritic) and more rarely to pelagic (outer bathyal) conditions. The age based on planktonic foraminifera and pollen is Early Albian.
Santos Basin