Phu Kradung Formation, Geological formation in Isan, Thailand.
Phu Kradung Formation is a geological unit in northeastern Thailand composed of brown siltstone with layers of shale and sandstone stacked in succession. These deposits form part of the Khorat Group and reach considerable thickness across the region.
These layers formed about 180 million years ago during the early Jurassic period and preserve evidence of ancient river and lake environments. Scientists confirm this age through analysis of mineral grains found within the sediments.
The formation attracts geologists and researchers who study the preserved vertebrate fossils, including the notable discovery of Chalawan thailandicus, an extinct crocodile species.
The formation is accessible at road cuts near Nong Bua Lamphu and is mainly visited by researchers and geology students. It helps to bring a local guide who can point out the different layers and explain what you are seeing.
The rocks hold remains of dinosaurs, pterosaurs, and other vertebrates that are rarely found in such abundance. These fossils offer rare windows into animal life from roughly 180 million years ago.
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