Cuche Formation, Geological formation in Eastern Ranges of Colombian Andes.
The Cuche Formation is a geological formation in the Eastern Ranges of the Colombian Andes composed of layered siltstone, shale, and sandstone beds. These rock layers spread across mountainous terrain and represent ancient deposits built up over millions of years.
Scientists initially categorized this formation as part of the Floresta Series in 1939, but Botero established its current classification in 1950. This reclassification helped geologists better understand the depositional patterns of the Andes.
The name Cuche comes from the Muysccubun language of the Muisca people who lived here before Spanish colonization. This naming reflects the lasting connection between the indigenous inhabitants and the mountainous land.
The formation sits at high altitude above 2,500 meters, requiring access via established pathways. Visitors should bring specialized equipment and hire experienced guides to safely explore this mountainous terrain.
In 2019 researchers discovered fragments of Pterygotus eurypterid here, a prehistoric sea scorpion documented in Colombia for the first time. This finding shows the area was once covered by ancient seas teeming with early animal life.
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