Herald Formation

Herald Formation Stratigraphic range: Late Ordovician PreЄ Є O S D C P T J K Pg N
Type	Geological formation
Sub-units	Lake Alma Member Coronach Member Redvers Unit
Underlies	Stony Mountain Formation
Overlies	Yeoman Formation
Thickness	up to 38 metres (120 ft)^[1]
Lithology
Primary	Limestone, dolomite, anhydrite
Location
Coordinates	49°04′29″N 104°39′08″W / 49.0746°N 104.6521°W / 49.0746; -104.6521 (Herald Formation)Coordinates: 49°04′29″N 104°39′08″W / 49.0746°N 104.6521°W / 49.0746; -104.6521 (Herald Formation)
Region	WCSB
Country	Canada
Type section
Named by	Saskatchewan Geological Society, 1958.

The Herald Formation is a stratigraphical unit of Late Ordovician age in the Western Canadian Sedimentary Basin.

It was defined in well Imperial Herald 1-31-1-20W2M by the Lower Paleozoic Names and Correlations Committee of the Saskatchewan Geological Society in 1958.^[2]

Lithology

The Herald Formation is composed of dolomitic limestone and dolomite, which can be microcrystalline, argillaceous or microlaminated. ^[1] In the centre of the basin, it is represented by anhydrite.

Distribution

The Herald Formation reaches a maximum thickness of 38 metres (120 ft) in the Lake Alma area.^[1]

Relationship to other units

The Herald Formation is disconformably overlain by the Stony Mountain Formation and conformably overlays the Yeoman Formation.^[1]

It can be correlated with the Fort Garry Member of the Red River Formation in Manitoba and in the Williston Basin.

Subdivisions

In south-eastern Saskatchewan, the formation is divided in three units, corresponding to three sedimentation cycles:

References

1 2 3 4 Lexicon of Canadian Geologic Units. "Herald Formation". Retrieved 2010-02-01.
↑ Saskatchewan Geological Society, 1958. Report of the Lower Paleozoic Names and Correlation Committee, Regina.

Western Canadian Sedimentary Basin

Hydrocarbon history	Oil sands and heavy oil Frontier exploration and development Natural gas liquids Natural gas

Depositional Regions	Southern Alberta Central Alberta Northwestern Alberta Plains South-central Canadian Rockies foothills North-east Plains North-central foothills Liard River Fort Nelson Northern Rocky Mountains Fort St. John Saskatchewan Western Manitoba

Saskatchewan	Cypress Hills FM Ravenscrag FM Frenchman FM Whitemud FM Eastend FM Bearpaw FM Judith River GRP Belly River FM Oldman FM Foremost FM Lea Park FM Pakowki FM Milk River FM Colorado GRP Viking FM Mannville GRP Pense FM Cantuar FM Success FM Vanguard FM Ellis GRP Swift FM Rierdon FM Sawtooth FM Shaunavon FM Piper FM Gravelbourg FM Gypsum Springs FM Watrous FM Big Snowy GRP Madison GRP Charles FM Poplar Ratcliffe Midale Mission Canyon FM Kisbey SS Alida Tilston Lodgepole FM Souris Valley Three Forks GRP Bakken FM Big Valley FM Torquay FM Saskatchewan GRP Birdbear FM Duperow FM Manitoba GRP Souris River FM Elk Point GRP Davson Bay FM Prairie FM Winnipegosis FM Ashern FM Interlake FM Stonewall FM Stony Mountain FM Herald FM Yeoman FM Winnipeg FM Deadwood FM Canadian Shield

This article is issued from Wikipedia - version of the Wednesday, August 08, 2012. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.