Sierra Ballena Shear Zone

Sierra Ballena Shear Zone or SBSZ is a sinistral strike-slip shear zone running across the Uruguayan Shield in eastern Uruguay and the Brazilian state of Rio Grande do Sul.

[2][3] The system was last active in the Precambrian.

[2]

Shear zones and terranes in Uruguay after Gaucher et al. ., 2008. [ 1 ] Sierra Ballena Shear Zone is marked as "SBSZ". To the west Sarandí del Yí Shear Zone is marked as "SYSZ".