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The Gull River Formation is a geological formation of Middle Ordovician age (Caradoc Stage), which outcrops in Ontario, Canada.[1] Lithologically, the formation is dominated by light grey to brown limestones and greenish gray dolomites with thin shale and sandstone interlayers.[2][3]

Fossil content

Invertebrates

Chelicerates

Chelicerates reported from the Gull River Formation
Genus Species Presence Material Notes Images
Lunataspis L. borealis Upper Member, Kingston, Ontario.[4] 3 specimens (1 adult & 2 juveniles or subadults).[4] A horseshoe crab.

Flora

Acritarchs

Acritarchs reported from the Gull River Formation
Genus Species Presence Material Notes Images
Dicommopalla D. rissae Southern Ontario.[5] Also found in the Bobcaygeon Formation.

References

  1. ^ “Gull River formation”. Natural Resources Canada. January 9, 2008. Retrieved January 4, 2015.
  2. ^ Armstrong, Derek K.; Dodge, J. E. P. (2007). Paleozoic Geology of Southern Ontario (PDF). Ontario Geological Survey. p. 4. ISBN 978-1-4249-4526-9.
  3. ^ Armstrong, D. K. (2000). Paleozoic Geology of the Northern Lake Simcoe Area, South-Central Ontario (PDF). Ontario Geological Survey. pp. 9–15. ISBN 978-0–7778–9451–4.
  4. ^ a b Lamsdell, James C.; Isotalo, Phillip A.; Rudkin, David M.; Martin, Markus J. (October 2022). “A new species of the Ordovician horseshoe crab Lunataspis”. Geological Magazine: 1–5. doi:10.1017/S0016756822000875. ISSN 0016-7568. S2CID 252723542.
  5. ^ Bunner, Wendy D.; Legault, J. A. (1989). “A New Species of Dicommopalla (Acritarcha) from the Middle Ordovician Simcoe Group of Southern Ontario, Canada”. Palynology. 13: 57–62. doi:10.1080/01916122.1989.9989354. ISSN 0191-6122. JSTOR 3687532.