Lower Permian Trilobites from northern Yukon Territory and Ellesmere Island, District of Franklin

APPLICATIONS OF PHOTOGRAMMETRY TO SURVEYS OF GLACIERS IN CANADA AND ALASKA

Canadian Journal of Earth Sciences ◽

10.1139/e66-061 ◽

1966 ◽

Vol 3 (6) ◽

pp. 783-798 ◽

Cited By ~ 14

Author(s):

Gottfried Konecny

Keyword(s):

Yukon Territory ◽

Ellesmere Island ◽

Ground Control ◽

Aerial Photogrammetry ◽

Survey Results

The paper emphasizes that the choice of a proper procedure is essential for efficient glacier surveying. Terrestrial versus aerial photogrammetry and the use of electronic surveying procedures versus triangulation have been tested in surveys on the Athabasca and Saskatchewan glaciers, and on glaciers in northern Ellesmere Island, southeastern Alaska, and the Yukon Territory. The Otto Fiord glacier survey in northern Ellesmere Island demonstrates that no ground control is needed for volumetric glacier studies. Accurate maps needed for other studies depend on the establishment of control. Control can most efficiently be determined by tellurometer and phototheodolite with helicopter support, as shown in Alaskan glacier surveys. For large glaciers phototopography provides a good means of extending control from tellurometer traverse stations, as demonstrated in the Mount Kennedy survey. Simple one-color maps are an economical means of preserving survey results for future glaciological evaluation.

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A Permian Hydrozoan Mound, Yukon Territory

Canadian Journal of Earth Sciences ◽

10.1139/e71-087 ◽

1971 ◽

Vol 8 (8) ◽

pp. 973-988 ◽

Cited By ~ 14

Author(s):

G. R. Davies

Keyword(s):

Growth Form ◽

Yukon Territory ◽

Source Rocks ◽

Lower Permian ◽

Canal System ◽

Rock Types ◽

System A ◽

Upper Paleozoic ◽

Paleozoic Rocks ◽

Richardson Mountains

A carbonate mound built by the hydrozoan Palaeoaplysina has been found in a poorly-exposed sequence of Lower Permian rocks in the northern Richardson Mountains of the Yukon Territory. Similar hydrozoan mounds have been described from Russia and northwestern United States. The Yukon mound is 12 ft (3.7 m) thick and at least 70 ft (21 m) long. It is underlain by marine siltstones and sandstones, and probably shale. The main mound rock is composed of curved hydrozoan plates enclosed in a bioclastic wackestone matrix, and is overlain successively by tubular–foram packstone and oolitic grainstone. Palaeoaplysina is characterized by a plate-like, laterally-expanding growth form, an internal canal system, a cellular calcareous skeleton, and 'mamelons' on the upper surface of well-preserved plates; 'mamelons' are the principal criterion for placing Palaeoaplysina in the Class Hydrozoa of the coelenterates.The Yukon mound is part of a thick sequence of Lower Permian terrigenous clastic and carbonate rocks deposited on the northern shelf of the ancestral Aklavik Arch. The repetition of similar rock types in the sequence indicates cyclicity, a thesis supported by similarities between the Yukon mound sequence and the Virgilian mound cycles in New Mexico.Lower Permian hydrozoan mounds and associated facies in the Pre-urals of Russia are known oil producers. The possibility exists that hydrozoan mounds, perhaps in multiple cyclic build-ups, may occur in upper Paleozoic rocks in the subsurface of the Yukon Territory. With suitable porosity development and source rocks, these predicted subsurface mounds could become hydrocarbon reservoirs and thus targets for oil exploration.

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