Gething Formation is a

stratigraphic Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy has three related subfields: lithostra ...

unit of

Lower Cretaceous Lower may refer to: *Lower (surname) *Lower Township, New Jersey *Lower Receiver (firearms) *Lower Wick Lower Wick is a small hamlet located in the county of Gloucestershire, England. It is situated about five miles south west of Dursley, eig ...

( Aptian) age in the Western Canada Sedimentary Basin. It is present in northeastern

British Columbia British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, ...

and western

Alberta Alberta ( ) is one of the thirteen provinces and territories of Canada. It is part of Western Canada and is one of the three prairie provinces. Alberta is bordered by British Columbia to the west, Saskatchewan to the east, the Northwest Ter ...

, and includes economically important coal deposits. The formation is named for Gething Creek, a right tributary of the

Peace River The Peace River (french: links=no, rivière de la Paix) is a river in Canada that originates in the Rocky Mountains of northern British Columbia and flows to the northeast through northern Alberta. The Peace River joins the Athabasca River in th ...

west of

Hudson's Hope Hudson's Hope is a district municipality in northeastern British Columbia, Canada, in the Peace River Regional District. Having been first settled along the Peace River in 1805, it is the third-oldest European-Canadian community in the province, a ...

, and the nearby Gething Mountain. It was first described by F.H. McLearn in 1923McLearn, F.H., 1923. Peace River Canyon Coal Area, British Columbia;

Geological Survey of Canada The Geological Survey of Canada (GSC; french: Commission géologique du Canada (CGC)) is a Canadian federal government agency responsible for performing geological surveys of the country, developing Canada's natural resources and protecting the e ...

, Summary Report 1922, Part B, pp. 1-46. in the

Canyon, an area that was partly inundated in 1968 by the

Williston Lake Williston Lake is a reservoir created by the W. A. C. Bennett Dam and is located in the Northern Interior of British Columbia, Canada. Geography The lake fills the basin of the upper Peace River, backing into the Rocky Mountain Trench which is ...

after the construction of the W. A. C. Bennett Dam.

Lithology

The formation consists of alternating units of

sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates ...

and carbonaceous shale or mudstone with some

coal Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is formed when ...

seams and conglomerate beds. The sandstones are fine- to coarse-grained, brown weathering, and typically platy to thin bedded, although some are massive. Mudstones are blocky to rubbly, with little lamination. Shale and carbonaceous shale units are

fissile In nuclear engineering, fissile material is material capable of sustaining a nuclear fission chain reaction. By definition, fissile material can sustain a chain reaction with neutrons of thermal energy. The predominant neutron energy may be t ...

and are commonly associated with the coal seams. The sediments are mostly of non-marine origin, deposited in deltaic and coastal plain settings.Stott, D.F. 1965. Lower Cretaceous Bullhead and Fort St John Groups, between Smoky and Peace Rivers, Rocky Mountain foothills, Alberta and British Columbia. Geological Survey of Canada, Bulletin 152, 279 p. .

Distribution

The Gething Formation is present in the foothills of the

Northern Rocky Mountains The Northern Rocky Mountains, usually referred to as the Northern Rockies, are a subdivision of the Canadian Rockies comprising the northern half of the Canadian segment of the Rocky Mountains. While their northward limit is easily defined as the ...

and adjacent areas of the plains, extending from the

region in northeastern British Columbia to the

Smoky River The Smoky River is a river in western Alberta, Canada. It is a major tributary of the Peace River. The descriptive name refers to the presence of "smouldering beds of coal in the riverbank" noted by the Cree Indians. It drains an area of . F ...

area of western Alberta. In the

Peace River Country The Peace River Country (or Peace Country; french: Région de la Rivière-de-la-paix) is an aspen parkland region centring on the Peace River in Canada. It extends from northwestern Alberta to the Rocky Mountains in northeastern British Columbia ...

, it reaches a thickness of , while in the Smoky River area it is thick. North of the Peace River at Carbon Creek, it reaches .

Relationship to other units

The Gething Formation is the uppermost unit of the

Bullhead Group Bullhead Group is a stratigraphic unit of Lower Cretaceous age in the Western Canada Sedimentary Basin of northeastern British Columbia and western Alberta. It was first defined by F.H. McLearn in 1918 as the Bullhead Mountain Formation, but later ...

. It conformably overlies the

Cadomin Formation The Cadomin Formation is a stratigraphic unit of Early Cretaceous (Barremian to Aptian) age in the western part of the Western Canada Sedimentary Basin. It is extends from southeastern British Columbia through western Alberta to northeastern Bri ...

and is disconformably overlain by the Bluesky Formation. It is correlated with the Gladstone Formation in the southern foothills, and is equivalent in age to the

McMurray Formation The McMurray Formation is a stratigraphic unit of Early Cretaceous age (late Barremian to Aptian stage) of the Western Canada Sedimentary Basin in northeastern Alberta. It takes the name from Fort McMurray and was first described from outcrops a ...

that contains the Athabasca Oil Sands.

Paleontology

Dinosaur Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is t ...

footprints described from the formation include both carnivorous and herbivorous species. Plant material is abundant, occurring as fossil leaves, stems, logs, stumps and rootlets.

Fern A fern (Polypodiopsida or Polypodiophyta ) is a member of a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers. The polypodiophytes include all living pteridophytes exce ...

cycad Cycads are seed plants that typically have a stout and woody (ligneous) trunk with a crown of large, hard, stiff, evergreen and (usually) pinnate leaves. The species are dioecious, that is, individual plants of a species are either male o ...

s, ''

Ginkgo ''Ginkgo'' is a genus of non-flowering seed plants. The scientific name is also used as the English name. The order to which it belongs, Ginkgoales, first appeared in the Permian, 270 million years ago, and is now the only living genus with ...

'' and conifers are represented.

Coal deposits

The Gething Formation contains coal seams that range from thin laminae to as much as thick. Coal rank ranges from low- to high-volatile bituminous, and the coal has good coking properties except where oxidized. It has been mined by underground methods near the Peace River west of Hudson's Hope and near the Sukunka River.

References

{{Authority control Geologic formations of Alberta Geologic formations of British Columbia Lower Cretaceous Series of North America Albian Stage Aptian Stage Barremian Stage Sandstone formations of Canada Siltstone formations Ichnofossiliferous formations Conglomerate formations Shale formations Coal formations