page_title: Middle Magdalena Valley
section_title: Stratigraphy
hierarchical_section_title: Middle Magdalena Valley / Stratigraphy
caption_attribution_description: Tectonic and stratigraphic event timeline of the Middle Magdalena Basin, Colombia.
context_page_description: The Middle Magdalena Valley, Middle Magdalena Basin or Middle Magdalena Valley Basin is an intermontane basin, located in north-central Colombia between the Central and Eastern Ranges of the Andes. The basin, covering an area of 34,000 square kilometres, is situated in the departments of Santander, Boyacá, Cundinamarca and Tolima.
  The basin is structurally bounded by the Palestina Fault to the west and the Bucaramanga Fault to the east. The Middle Magdalena Valley hosts the middle course of the Magdalena River, the main river of Colombia, flowing from the Upper Magdalena Valley in the south to the Lower Magdalena Valley to the northwest. The basin is elongated with an approximate width of 80 km and extends to the north for approximately 450 km, where it terminates against the Santander Massif and Cesar Valley. To the south, it terminates against the Upper Magdalena Valley, which consists of the Girardot and Neiva Sub-basins where the Central and Eastern Ranges converge.
  The basin is an important producer of oil in Colombia, with main fields Yariguí-Cantagallo, Moriche, Casabe, La Cira-Infantas, Velásquez, Santos, Palagua, Teca, Payoa and Lisama.
context_section_description: The stratigraphy of the Middle Magdalena Basin can be divided into three sequences separated by angular unconformities. The basement of these sequences is Pre-Mesozoic metaclastics and sediments which are now exposed on the surface of the Central Cordillera as a result of its deformation and uplift. This geologic basement is at most 15 kilometres (9.3 mi) deep, with faulted sections shifted up to approximately 10 kilometres (6.2 mi) in depth. The unconformity that separates the basement from the first sequences indicates the approximate time rifting began.
caption: Tectonic and stratigraphic timeline of the Middle Magdalena Basin, Colombia.[2][4][10]
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