Raspberry Formation

Coordinates: 57°30′N 130°36′W / 57.5°N 130.6°W

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Raspberry Formation
Stratigraphic range: 11.4–5.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation^[1]
Unit of	Mount Edziza volcanic complex^[2]
Underlies	Little Iskut Formation^[1] Armadillo Formation^[1]
Overlies	Stikinia^[1]
Lithology
Primary	Alkali basalt, hawaiite^[1]
Location
Coordinates	57°30′N 130°36′W / 57.5°N 130.6°W / 57.5; -130.6^[2]
Region	British Columbia^[1]
Country	Canada^[1]
Type section
Named for	Raspberry Pass^[1]
Named by	Souther et al., 1984^[3]

The Raspberry Formation is a stratigraphic unit of Miocene age in northwestern British Columbia, Canada.

Naming

The Raspberry Formation takes its name from Raspberry Pass, a mountain pass cutting through the central portion of the Mount Edziza volcanic complex.^[1]^[4]

Geology

The Raspberry Formation has a volume of 119 km³ (29 cu mi), making it the third most voluminous geological formation comprising the Mount Edziza volcanic complex.^[1]^[2] It varies in elevation from less than 1,310 m (4,300 ft) along the Mess Creek Escarpment to 1,740 m (5,710 ft) near Armadillo Peak.^[1]

The Raspberry Formation is overlain conformably by the Little Iskut Formation. An erosion surface separates the Raspberry Formation from the overlying Armadillo Formation and younger geological formations. Rocks of the Stikinia terrane underlie the Raspberry Formation.^[1]

The Raspberry Formation consists of flat-lying alkali basalt and hawaiite flows. These flows are rusty brown and are interbedded with reddish-brown to yellow or orange scoria.^[1] The Raspberry Formation represents three overlapping Miocene shield volcanoes.^[2]

K–Ar dating has yielded ages of 11.4 ± 1.5 million years, 8.4 ± 0.4 million years and 6.4 ± 0.3 million years for Raspberry hawaiite and 6.1 ± 0.4 million years and 5.5 ± 0.1 million years for Raspberry alkali basalt.^[1]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ Souther, J. G. (1992). The Late Cenozoic Mount Edziza Volcanic Complex, British Columbia. Geological Survey of Canada (Report). Memoir 420. Canada Communication Group. pp. 3, 32, 47, 61, 249, 267. doi:10.4095/133497. ISBN 0-660-14407-7.
^ ^a ^b ^c ^d 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.
^ "Raspberry Formation". Lexicon of Canadian Geologic Units. Government of Canada. Retrieved 2023-08-04.
^ "Raspberry Pass". BC Geographical Names. Archived from the original on 2021-10-19. Retrieved 2023-04-17.

v t e Mount Edziza volcanic complex
Cinder cones	The Ash Pit Cache Hill Camp Hill Cinder Cliff Cocoa Crater Coffee Crater Eve Cone Exile Hill Icefall Cone Kana Cone Keda Cone Klastline Cone Mess Lake Cone Moraine Cone Nahta Cone Outcast Hill Ridge Cone Sidas Cone Sleet Cone Source Hill Storm Cone Thaw Hill Triplex Cones Twin Cone Walkout Creek centres Williams Cone
Subglacial volcanoes	Pillow Ridge Tennena Cone Tsekone Ridge Wetalth Ridge
Central volcanoes	Armadillo Peak Mount Edziza Ice Peak Spectrum Range
Lava domes	Glacier Dome IGC Centre Nanook Dome Pharaoh Dome The Pyramid Sphinx Dome Triangle Dome
Lava fields	Desolation Lava Field Mess Lake Lava Field Snowshoe Lava Field
Plateaus	Arctic Lake Plateau Big Raven Plateau Kitsu Plateau
Ridges	Artifact Ridge Cartoona Ridge Idiji Ridge Obsidian Ridge Pillow Ridge Sorcery Ridge Tsekone Ridge Wetalth Ridge Yagi Ridge
Mountain passes	Destell Pass Raspberry Pass
Bluffs	Koosick Bluff Ornostay Bluff
Glaciers	Idiji Glacier Tenchen Glacier Tencho Glacier Tennaya Glacier
Streams	Artifact Creek Ball Creek Bourgeaux Creek Chakima Creek Crayke Creek Elwyn Creek Flyin Creek Gerlib Creek Kadeya Creek Kitsu Creek Little Iskut River More Creek Nagha Creek Nido Creek Pyramid Creek Raspberry Creek Sezill Creek Shaman Creek Sorcery Creek Stewbomb Creek Tadekho Creek Taweh Creek Tenchen Creek Tennaya Creek Tsecha Creek Walkout Creek
Geological formations	Armadillo Formation Big Raven Formation Edziza Formation Klastline Formation Little Iskut Formation Nido Formation Pyramid Formation Raspberry Formation
Other	Gnu Butte Mess Creek Escarpment Volcanism of the Mount Edziza volcanic complex

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See also

References