Phra Wihan Formation, Geological formation in Uttaradit Province, Thailand.
The Phra Wihan Formation is a geological layer in Uttaradit Province composed of alternating bands of sandstone, siltstone, and mudstone. This rock sequence spans across the region and reveals the history of ancient river systems through its different strata.
The formation developed during the Early Cretaceous period, approximately 145 to 133 million years ago, built up by deposits from river channels. This geological layer documents a long phase of continental sediment accumulation in the region.
Researchers and geologists from Thailand and international institutions regularly conduct field studies to analyze the formation's fracture systems and reservoir characteristics.
Visitors will find this geological formation visible at various locations across the region and it is best explored with local guidance. Sturdy footwear and basic knowledge of geology help when observing the different rock layers in person.
The layers contain fossilized footprints of sauropods, offering insights into the behavior of these giant dinosaurs. These fossils show how these animals once crossed the river landscapes of the region.
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