The bounding fault to the south, the dextral Cuisa Fault with a lateral displacement of , has an extension of approximately along a roughly east-west axis and the fault continues to the east underneath the Gulf of Venezuela. The fault is partly covered by Oligocene sediments. The northern boundary of the pull-apart basin is formed by the roughly northwest-southeast-trending Macuira Fault, with an extension of about . The sinistral oblique fault has a displacement of about and uplifted the northeastern Serranía de Macuira.