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 dolomites with thin shale and sandstone interlayers.
Fossil content Invertebrates Chelicerates Chelicerates reported from the Gull River Formation Genus Species Presence Material Notes Images LunataspisL. borealis Upper Member, Kingston, Ontario.3 specimens (1 adult & 2 juveniles or subadults). A horseshoe crab.
Flora Acritarchs Acritarchs reported from the Gull River Formation Genus Species Presence Material Notes Images DicommopallaD. rissae Southern Ontario. Also found in the Bobcaygeon Formation.
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