Bertie Formation, Geological formation in western New York, United States.
The Bertie Formation is a geological sequence in western New York composed of alternating layers of dolomite, limestone, and shale. These deposits formed in a shallow sea and are visible today at several locations where the ground has been cut away or naturally eroded.
The formation was formally named and classified in 1884 after researchers recognized its distinctive characteristics. It dates back to the Silurian period about 420 million years ago, when this area lay beneath a shallow sea.
Research teams from multiple universities conduct regular field studies at the formation to examine marine fossils and sedimentary patterns.
The best views of the layers can be seen after heavy rainfall or at locations where the ground has been cut away for construction. Comfortable shoes and weather protection are helpful since some sites are exposed to the elements.
This site contains exceptionally well-preserved fossils of eurypterids, ancient marine arthropods from the Silurian period. These complete skeletons offer a rare glimpse into the life forms that inhabited the ancient sea that once covered this region.
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