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| '''Stratigraphy''' | '''Stratigraphy''' | ||
| The Huronian Supergroup consists of four Groups. All the rocks are low grade metamorphic sedimentary rocks or igneous rocks. The four groups that make up the Huronian are the Elliot Lake Group, Hough Lake |
The Huronian Supergroup consists of four Groups. All the rocks are low grade metamorphic sedimentary rocks or igneous rocks. The four geologic groups that make up the Huronian are the Elliot Lake Group, Hough Lake Group, Quirke Lake Group, and the Cobalt Group (from oldest to youngest). | ||
| '''Age''' | |||
| The bulk of the Huronian Group consists of mostly metamorphosed sandstones and mudstones. Since there are no index fossils, the sedimentary rocks cannot be dated using fossils, like they can in ] rocks. However, the base contains volcanics that have been dated at about 2.480 billion years ago (Gya). The top of the Huronian and cross cutting all of the units within are the Nippissing Intrusions which date to 2.2185 Gya. The age at which the Huronian sediments were deposited is between 2.480 Gya and 2.219 Gya. | |||
| ==References== | ==References== | ||
| {{reflist}} | {{reflist}} | ||
Revision as of 20:01, 13 December 2012
The Huronian Supergroup is a Proterozoic assemblage of geologic formations of the Superior craton of the Canadian Shield in Ontario and Quebec. It extends from the city of Sault Ste. Marie in the west to the Ontario-Quebec border to the east and is part of the Southern Geologic Province.
Stratigraphy
The Huronian Supergroup consists of four Groups. All the rocks are low grade metamorphic sedimentary rocks or igneous rocks. The four geologic groups that make up the Huronian are the Elliot Lake Group, Hough Lake Group, Quirke Lake Group, and the Cobalt Group (from oldest to youngest).
Age The bulk of the Huronian Group consists of mostly metamorphosed sandstones and mudstones. Since there are no index fossils, the sedimentary rocks cannot be dated using fossils, like they can in Phanerozoic rocks. However, the base contains volcanics that have been dated at about 2.480 billion years ago (Gya). The top of the Huronian and cross cutting all of the units within are the Nippissing Intrusions which date to 2.2185 Gya. The age at which the Huronian sediments were deposited is between 2.480 Gya and 2.219 Gya.
References
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