Williams Fork Formation, Geological formation in western Colorado, US
The Williams Fork Formation is a geological rock layer in western Colorado. It consists of alternating layers of mudstone and sandstone that span across a large basin area and reveal different environmental conditions from the past.
This rock layer formed between about 73 and 70 million years ago during the Late Cretaceous period. It developed during a time of major geological changes in North America that significantly altered the region's landscape and life forms.
The formation serves as a research site for paleontologists and geologists studying prehistoric life through its preserved dinosaur and mammal fossils.
The best places to view this rock layer are locations with natural exposures where the layers are visible at the surface. Anyone visiting these spots should prepare for rough terrain and changeable weather conditions in the mountains.
Within these layers are volcanic ash deposits that contain zircon crystals with exceptional properties. These crystals allow scientists to determine very precise dates and understand exactly when certain events in Earth's history took place.
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