The Bertie Group is a Late Silurian sequence of dolostone layers exposed across parts of southern Ontario and western New York, roughly four hundred and twenty three million years old, notable for the Fiddlers Green Formation within it, which preserves eurypterids, the extinct sea scorpions, in some of the largest and most diverse assemblages known, alongside other marine invertebrates. The group's fossil beds have made it a long studied source for understanding these ancient predatory arthropods.
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Bertie Group (Wikipedia)
In Discipline: Stratigraphy, Lead paragraph
The Bertie Group or Bertie Limestone, also referred to as the Bertie Dolomite and the Bertie Formation, is an upper Silurian (Pridoli, or Cayugan) geologic group and Lagerstätte in southern Ontario, Canada, and western New York State, United States
Caused By: Sedimentation, Article text
The late Silurian climate was arid and warm; this, and the restricted and shallow nature of the inland basin, resulted in the deposition of evaporites in the Salina Group, ranging in thickness from 120 to 800 metres (390 to 2,620 ft).
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