Figure 1. A) Biotite and muscovite grains deformed by mechanical compaction, while some quartz grains are dissolved by chemical compaction in contact with the micas. Uncrossed polarizers. Jurassic, Reconcavo Basin, NE Brazil. B) Feldspar and quartz grains strongly fractured in proximity of fault zone. Lower Cretaceous, Araripe Basin, NE Brazil. Uncrossed polarizers. C) Concave-convex and sutured intergranular contacts in sandstone with strong chemical compaction. Jurassic, Reconcavo Basin, NE Brazil. Uncrossed polarizers. D) Sandstone with pervasive cementation by pre-compaction, poikilotopic calcite. Lower Cretaceous, Reconcavo Basin, NE Brazil. Cross polarizers.