Gull River Formation

Updated on Dec 18, 2024

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Type Formation Country Canada, United States Year defined 1939 Overlies Shadow Lake Formation Regions Ontario, New York		Other Shale, sandstone Named by V. J. Okulitch Named for Gull River Underlies Bobcaygeon Formation Primary Limestone, Dolostone

Unit of Simcoe GroupBlack River Group

The Gull River Formation is a geological formation of Middle Ordovician age (Caradoc Stage), which outcrops in Ontario, Canada. Lithologically, the formation is dominated by light grey to brown limestones and greenish gray dolostones with thin shale and sandstone interlayers.

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