page_title: Bertie Formation
section_title: Fossils
hierarchical_section_title: Bertie Formation / Fossils
caption_attribution_description: English: Dynamic depiction by Danielle Dufault (ROM) of the fish Nerepisacanthus swimming above algae in a lagoonal setting representing the Bertie Konservat-Lagerstätte paleoenvironment.
context_page_description: The Bertie Formation, also called Bertie Limestone and Bertie Dolomite, formerly named as Bertie Group, is a Late Silurian geologic formation and Lagerstätte in southern Ontario, Canada and western New York State, United States. The formation comprises dolomites, limestones and shales and reaches a thickness of 495 feet in the subsurface, while in outcrop the formation can be 60 feet thick.
  The formation represents the uppermost unit of the Salina Group and the youngest Silurian formation in Ontario. The formation overlies the Camillus Formation and is in Ontario conformably overlain by the Bois Blanc Formation and in New York by the Onondaga Limestone, both dating to the Devonian.
  The Bertie Formation is considered a Konservat-Lagerstätte; a formation renowned for the preservation of a unique fauna. The formation has provided many fossils of Silurian eurypterids and Proscorpius osborni, the oldest known scorpion, as well as primitive fossil flora and the fish Nerepisacanthus denisoni. The excellent preservation of the many eurypterids possibly was the result of periodic hypersaline and anoxic conditions.
context_section_description: The Bertie Formation is considered a Konservat-Lagerstätte; a formation characterized by a rich and well-conserved fauna. The formation has provided more than 800 fossil eurypterids (sea scorpions). Of just Eurypterus lacustris almost 600 specimens were found in the Williamsville Member. Other fossils from the formation are Proscorpius osborni, the oldest known scorpion, flora and a fossil fish; Nerepisacanthus denisoni. The excellent preservation of the many eurypterids possibly was the result of periodic hypersaline and anoxic conditions.
caption: The fish Nerepisacanthus denisoni is the only vertebrate found in the Bertie Formation
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