Earth:Gull River Formation
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| Gull River Formation Stratigraphic range: Caradoc ~460.9–449 Ma | |
|---|---|
 Gull River Formation exposed along the shore of Lake St. John, Ramara | |
| Type | Formation |
| Unit of |
|
| Underlies |
|
| Overlies | Shadow Lake Formation |
| Lithology | |
| Primary | Limestone, dolomite |
| Other | Shale, sandstone |
| Location | |
| Region | Ontario New York Pennsylvania |
| Country | Canada United States |
| Type section | |
| Named for | Gull River |
| Named by | V. J. Okulitch |
| Year defined | 1939 |
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
- ↑ "Gull River formation". Natural Resources Canada. January 9, 2008. http://weblex.nrcan.gc.ca/html/006000/GSCC00053006056.html. Retrieved January 4, 2015.
- ↑ Armstrong, Derek K.; Dodge, J. E. P. (2007). Paleozoic Geology of Southern Ontario. Ontario Geological Survey. pp. 4. ISBN 978-1-4249-4526-9. http://maps.niagararegion.ca/Metadata/md/DocumentUpload/2007-08-08%2014-44-38.pdf.
- ↑ Armstrong, D. K. (2000). Paleozoic Geology of the Northern Lake Simcoe Area, South-Central Ontario. Ontario Geological Survey. pp. 9–15. ISBN 978-0--7778--9451--4. http://www.geologyontario.mndmf.gov.on.ca/mndmfiles/pub/data/imaging/OFR6011/OFR6011.pdf.
- ↑ 4.0 4.1 Lamsdell, James C.; Isotalo, Phillip A.; Rudkin, David M.; Martin, Markus J. (October 2022). "A new species of the Ordovician horseshoe crab Lunataspis" (in en). Geological Magazine: 1–5. doi:10.1017/S0016756822000875. ISSN 0016-7568. https://www.cambridge.org/core/journals/geological-magazine/article/new-species-of-the-ordovician-horseshoe-crab-lunataspis/E198745336B0E124E34966425F35FB02.
- ↑ 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. https://www.jstor.org/stable/3687532.
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