à vergence avant

OBS: vergence: Sens de déversement d'un pli, sens vers lequel se fait un chevauchement (pli, faille ou nappe de charriage).
OBS: à vergence avant : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

CONT: Systematically, a thrust wedge was developed close to the backstop in the lower sand layer showing the classic configuration of fragile systems. Forward-verging thrusts being the dominant structures and backthrusts only developing as secondary features.
OBS: While the majority of the structures are forward verging, there are local domains dominated by backthrusting and a frontal wedge.