Abanico Formation, Geological formation in O'Higgins Region, Chile
The Abanico Formation is a geological layer that extends across central Chile, composed of sedimentary rocks buried beneath the Andes. It consists of various rock types arranged in stacked layers that reach deep into the earth beneath the mountain range.
The formation developed during the Eocene and Miocene periods when the Andes were building up and diverse sediments accumulated. These processes unfolded over millions of years as the geological character of the region transformed.
The formation holds significance for researchers because it preserves evidence of ancient animal life that once inhabited this region. These remains help scientists understand how life evolved in the Andean landscape over deep time.
The formation is accessible across two north-south trending strips between 33 and 36 degrees south latitude in the Chilean Andes. Access to these areas involves challenging mountain terrain, and visitors should be prepared for difficult conditions or consider guided visits.
The formation contains volcanic rocks such as basalt and andesite that were significantly altered by hot fluids moving through the earth. This metamorphic transformation gives certain sections distinctive mineral characteristics that researchers observe while studying the layers.
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