Figure 14. Illustration of the similarities and differences that exist between the tectonostratigraphic characteristics of the Columbus Basin, Trinidad, model (a) and that of Evamy et al. (1978) Niger Delta, Nigeria, model (b). Note the bidirectional wedging of sediments, both distal toward the shale diapir and proximal toward the normal fault, in the Columbus Basin, as compared with the unidirectional wedging proximally that occurs in the Niger Delta.