| 词条 | Nahanni Formation |
| 释义 |
| name = Nahanni Formation | image = | imagesize = | caption = | type = Geological formation | age = {{Fossil range|Givetian|Givetian|Givetian}} | prilithology = Limestone | otherlithology = | namedfor = Nahanni Butte | namedby = C.O. Hage, 1945 | region = WCSB | country = {{flag|Canada}} | coordinates = {{coord|61|03|0|N|123|37|0|W|display=inline,title|name= Nahanni Formation}} | unitof = | subunits = | underlies = Fort Simpson Formation Horn River Formation | overlies = Headless Formation | thickness = up to {{convert|137|m|ft|-1}}[1] | extent = | area = | map = | map_caption = }} The Nahanni Formation is a stratigraphical unit of Givetian age in the Western Canadian Sedimentary Basin. It takes the name from Nahanni Butte, a prominent ridge at the confluence of the South Nahanni River and Liard River, and was first described in outcrop on the south face of the mountain by C.O. Hage in 1945.[1] LithologyThe Nahanni Formation is composed of dolomitic limestone. [2]Hydrocarbon productiongas is produced from the Nahanni Formation in the Mackenzie River Valley. PaleontologyThe Nahanni Formation contains paleofauna compose of corals, brachiopods and trilobites. DistributionThe Nahanni Formation reaches a maximum thickness of {{convert|137|m|ft|-1}} at Nahanni Butte, and has typical thickness of {{convert|60|m|ft|-1}}. It occurs from the Franklin Mountains in the north to north-eastern British Columbia in the south.[2] Relationship to other unitsThe Nahanni Formation is conformably overlain by the Fort Simpson Formation in the west and by the Horn River Formation in the east. It overlays the Headless Formation diachronically and transitionally, with younger deposits occurring in the west.[2] It is equivalent to the upper part of the Hume Formation in the Mackenzie River area, as well as the Lonely Bay Formation, Pine Point Formation and Little Buffalo Formation in the Great Slave Lake area. In northern Alberta it corresponds to the Keg River Formation. References1. ^Hage, C.O., 1945. Geological reconnaissance along the lower Liard River, British Columbia, Yukonand Northwest Territories. Geol. Surv. Can., Paper 45-22. {{Western Canadian Sedimentary Basin|Liard_River=yes}}2. ^1 2 3 {{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:010486|title= Formation|author=Lexicon of Canadian Geologic Units |accessdate=2010-02-01}} 4 : Stratigraphy of British Columbia|Stratigraphy of the Northwest Territories|Devonian southern paleotropical deposits|Givetian |
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