Gull River Formation Explained

Gull River Formation
Type:	Formation
Age:	Caradoc ~
Period:	Sandbian
Prilithology:	Limestone, dolomite
Otherlithology:	Shale, sandstone
Namedfor:	Gull River
Namedby:	V. J. Okulitch
Year Ts:	1939
Region:
Country:
Unitof:	Simcoe Group Black River Group
Underlies:	Bobcaygeon Formation Coboconk Formation
Overlies:	Shadow Lake Formation

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

Flora

Acritarchs

Notes and References

1. Web site: Gull River formation. Natural Resources Canada. January 4, 2015. January 9, 2008.
2. Book: Armstrong. Derek K.. Dodge. J. E. P.. Paleozoic Geology of Southern Ontario. 2007. Ontario Geological Survey. 978-1-4249-4526-9. 4.
3. Book: Armstrong. D. K.. Paleozoic Geology of the Northern Lake Simcoe Area, South-Central Ontario. 2000. Ontario Geological Survey. 978-0--7778--9451--4. 9–15.
4. 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 . en . 1–5 . 10.1017/S0016756822000875 . 252723542 . 0016-7568. free .
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 . 10.1080/01916122.1989.9989354 . 3687532 . 0191-6122.