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A moderate amount of vertical-axis clockwise rotation of the Santa Marta massif (30°) explains as much as 115km of extension (stretching of 1.75) along its trailing edge (Plato-San Jorge basin) and up to 56km of simultaneous shortening with an angular shear of 0.57 along its leading edge (Perijá range). Extensional deformation is recorded in the 260km-wide, fan-shaped Plato-San Jorge basin by a 2–8km thick, shallowing-upward and almost entirely fine-grained, upper Eocene and younger sedimentary sequence. The simultaneous initiation of shortening in the Cesar-Ranchería basin is documented by Mesozoic strata placed on to lower Eocene syntectonic strata (Tabaco Formation and equivalents) along the northwest-verging, shallow dipping (9–12° to the southeast) and discrete Cerrejón thrust. First-order subsidence analysis in the Plato-San Jorge basin is consistent with crustal stretching values between 1.5 …