Kaili Formation, Geological formation in Jianhe County, Guizhou, China
Kaili Formation is a geological layer sequence in Jianhe County composed of mudstone, siltstone, and shale stacked in thick vertical sections. These rock layers preserve a detailed record of ancient life and environmental conditions from the Cambrian period.
Scientists identified the formation during the mid-20th century, uncovering fossils from the Cambrian period spanning 513 to 506 million years ago. These discoveries provided crucial evidence for understanding the emergence of early animal life on Earth.
The formation serves as an educational center where researchers and students examine rock layers to understand Earth's geological and biological evolution.
The site sits in mountainous terrain and requires local guidance along with proper permits for access. Plan your visit during drier months when pathways are easier to navigate.
The Wuliu-Zengjiayan section holds the official global reference point for the Miaolingian series and Wuliuan stage of the Cambrian period. This location serves as the standard against which geologists compare rock layers from the same era worldwide.
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