Macanal Formation, Geological formation in Eastern Cordillera, Colombia.
The Macanal Formation is a geological layer sequence in Colombia's Eastern Cordillera consisting of organic shale, limestone, and gypsum stacked in alternating beds. These materials reach a substantial depth as you move downward through the rock layers.
It formed during the Early Cretaceous period across the Berriasian and Valanginian time intervals through extensive tectonic movements. Over millions of years, marine sediments accumulated and compacted to create the rock layers visible today.
The name comes from the Muysca language and refers to either a wooden club or a native palm tree species found in the region. This linguistic connection reflects how the landscape has been understood by communities living here for generations.
You can observe exposed rock sections at multiple roadside locations, especially along the road from Bogota to Villavicencio. The clearest views of the layers appear in the Bata River canyon, where the formations stand out against the valley walls.
This rock sequence contains emeralds that hold significant commercial value for the region and are sought globally. Simultaneously, it also functions as a source material for petroleum and natural gas extraction in surrounding areas.
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