The Jureia Formation (Portuguese: Formacão Jureia) is a geological formation of the Santos Basin offshore of the Brazilian states of Rio de Janeiro, São Paulo, Paraná and Santa Catarina.

The predominantly shale with interbedded siltstones and fine sandstones formation dates to the Late Cretaceous period; Santonian-Maastrichtian epochs and has a maximum thickness of 2,000 metres (6,600 ft).

The formation is a reservoir rock of the Merluza Field, the first discovery in the Santos Basin.

The depositional environment is thought to be of a marine platform setting as pro-delta facies on the shelf edge.

[4] The formation is the reservoir rock of the Merluza Field, the first discovery in 1979 of the Santos Basin.