The Pre-Salt Layer is a geological formation on a continental shelf. The layer is of importance because it often holds significant petrochemical resources[1].
[2]
^Brazil as an economic superpower?: understanding Brazil's changing role in the global economy, Lael Brainard, Leonardo Martinez-Diaz, Brookings Institution Page 33.
^African Basins, Richard C. Selley, 1997, Elsevier, page 180
