Nido Formation
Naming
The Nido Formation takes its name from Nido Creek, a stream flowing northeast from the eastern flank of Mount Edziza into Nuttlude Lake. Nido means "white man" in the Tahltan language.
Geology
The Nido Formation has a volume of 127 km (30 cu mi), making it the second most voluminous geological formation of the Mount Edziza volcanic complex after the Armadillo Formation. It overlies the Raspberry, Armadillo and Little Iskut formations, all of which are Miocene in age. Also underlying the Nido Formation are pre-Tertiary rocks of the Stikinia terrane. Overlying the Nido Formation are the Spectrum, Pyramid, Ice Peak, Edziza and Big Raven formations which are of Pliocene age and younger.
Two subunits comprise the Nido Formation, namely the Tenchen Member and the Kounugu Member. Both members are separated by the Armadillo Highlands in the middle of the Mount Edziza volcanic complex. The Tenchen Member forms a lava field north of the Armadillo Highlands while the Kounugu Member forms a lava field south of the highlands.
The Nido Formation consists of alkali basalt and hawaiite lava flows that issued from multiple eruptive centres. K–Ar dating has yielded ages of 7.8 ± 0.3 million years, 5.5 ± 1.6 million years, 4.5 ± 0.3 million years and 4.4 ± 0.5 million years for Nido alkali basalt.
See also
References
- ^ Souther, J. G. (1992). The Late Cenozoic Mount Edziza Volcanic Complex, British Columbia. Geological Survey of Canada (Report). Memoir 420. Canada Communication Group. pp. 93, 95, 98, 100, 246, 248, 249, 267. doi:10.4095/133497. ISBN 0-660-14407-7.
- ^ Edwards, Benjamin Ralph (1997). Field, kinetic, and thermodynamic studies of magmatic assimilation in the Northern Cordilleran Volcanic Province, northwestern British Columbia (PhD thesis). University of British Columbia. p. 10. ISBN 0-612-25005-9.
- ^ "Nido Formation". Lexicon of Canadian Geologic Units. Government of Canada. Retrieved 2023-08-04.
- ^ "A 502" (Topographic map). Telegraph Creek, Cassiar Land District, British Columbia (3 ed.). 1:250,000. 104 G (in English and French). Department of Energy, Mines and Resources. 1989. Archived from the original on 2021-05-02. Retrieved 2023-06-29.
- ^ "Nido Creek". BC Geographical Names. Retrieved 2023-06-29.
