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A total of 56 fission-track ages are reported on 21 apatite, 19 zircon and 2 sphene concentrates from 24 rock samples collected from Toas Island (3) and the Sierra de Perijá (9), Western Venezuela, and from the Santander Massif (12), Eastern Colombia. All apatite ages, set by cooling on uplift, date points on uplift curves. Portions of such uplift curves are late Oligocene (27–22 Ma) in the southeast piedmont of the Sierra de Perijá; early to middle Miocene (19–14 Ma) in the western piedmont and (16–14 Ma) in the central Santander Massif; middle Miocene (13 Ma) in Toas; late Miocene...

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