Willwood Formation, Sedimentary formation in Bighorn Basin, Wyoming, United States.
The Willwood Formation is a sequence of geological layers in the Bighorn Basin in northwest Wyoming composed of alternating mudstone, sandstone, and shale deposits. These approximately 700 meters of strata contain thousands of fossils that document life from this ancient time period.
The formation developed 56 to 48 million years ago during the early Eocene epoch, shortly after dinosaurs disappeared from Earth. The layers document the beginning of mammal dominance in this region during that time.
The site draws researchers and fossil enthusiasts who study the remains to understand early life after the dinosaurs disappeared. These specimens reveal what creatures and plants lived in this region during a time when the landscape was vastly different from today.
Visitors gain the best insight into this geological site through museums and information centers in the region where fossils are displayed and explained. Guided visits from experienced professionals help you understand the layers and their significance more clearly.
The soil layers show a gradual shift in climate from wet to drier conditions, visible through color changes from orange to red tones. These visible color transitions are evidence of how environmental conditions transformed over millions of years.
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