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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The Bolivar geosyncline extends through coastal Ecuador and Colombia from southwestern Ecuador to the Golfo de Uraba. Six cross-basin highs separate the deeps within the trough. Marine sedimentation began in the south in the middle Eocene, gradually encroached northward, and continued intermittently on into the upper Miocene. Several unconformities of varying importance are present. Post-Miocene sedimentation is mostly non-marine. During the early Tertiary the sediments were largely derived from the west, but after the lower Miocene they were mostly from the east. Migration of terrestrial animals could have taken place through this area during the periods from upper Cretaceous to middle Eocene, middle Oligocene, lower Miocene, middle Miocene, and from upper Miocene to Rec nt.
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