Ellis Group

Not to be confused with Ellis Bay Formation.
Ellis Group
Stratigraphic range: Bajocian-Oxfordian
TypeGeological group
Sub-unitsSwift, Rierdon, Piper & Sawtooth Formations
UnderliesMannville Group
OverliesRundle Group & Shaunavon Formation
Thicknessup to 150 m (490 ft)[1]
Lithology
PrimaryShale, sandstone
OtherSiltstone, limestone
Location
Coordinates48°00′N 108°36′W / 48.0°N 108.6°W / 48.0; -108.6
Approximate paleocoordinates40°54′N 49°12′W / 40.9°N 49.2°W / 40.9; -49.2
RegionAlberta, Saskatchewan, Montana, Wyoming
CountryCanada, United States
ExtentWCSB
Type section
Named forFort Ellis
Named byA.C. Peale
Year defined1893
Ellis Group is located in Canada
Ellis Group
Ellis Group (Canada)
Gypsum bed in the Piper Formation, Big Horn Basin of Wyoming

The Ellis Group is a stratigraphic unit of Bajocian-Oxfordian age in Alberta, Saskatchewan, Montana and Wyoming in the Western Canadian Sedimentary Basin. It takes the name from Fort Ellis, Montana, and was first described in outcrop in the Rocky Creek Canyon by A.C. Peale in 1893.[2]

Lithology

The Ellis Group is composed of shale and sandstones deposited in a marine and transitional environment. [1]

Hydrocarbon production

Oil is produced from the Sawtooth Formation in southeastern Alberta.

Distribution

The Ellis Group laterally occurs in the subsurface in southern Alberta and northern and central Montana.[1] It is typically 80 metres (260 ft), but thickens on either side of the Sweetgrass Arch and reaches up to 150 metres (490 ft) in southeastern Alberta.

Subdivisions

The Ellis Group includes the following formations, from top to bottom:

Sub-unit Age Lithology Max.
thickness		 Notes
Swift Formation Oxfordian marine shale, transitional shale, siltstone and sandstone 41 m (130 ft)
[3]
Rierdon Formation Bathonian to Callovian marine shale and limestone 60 m (200 ft)
[4]
Sawtooth Formation Bajocian to Bathonian quartzose sandstone with shale 41 m (130 ft)
[5]
Piper Formation Middle Jurassic sandy limestone (top)
papery shale
siltstone and shale
grey limestone
white gypsum (base)		 23 m (80 ft)
[6]

Relationship to other units

The Ellis Group is unconformably overlain by the shales and sandstones of the Mannville Group and rests on the carbonates of the Rundle Group. It grades westwards to the shales of the Fernie Group, and eastwards to the shale, sandstones and limestones of the Vanguard and Shaunavon Formations.[1]

References

  1. ^ a b c d Lexicon of Canadian Geologic Units. "Ellis Group". Retrieved 2010-01-01.{{cite web}}: CS1 maint: deprecated archival service (link)
  2. ^ Peale, A.C., 1893. The Paleozoic section in the vicinity of Three Forks, Montana. United States Geological Survey, Bulletin 110, p.9-56.
  3. ^ Lexicon of Canadian Geologic Units. "Swift Formation". Retrieved 2010-01-03.{{cite web}}: CS1 maint: deprecated archival service (link)
  4. ^ Lexicon of Canadian Geologic Units. "Rierdon Formation". Retrieved 2010-01-03.{{cite web}}: CS1 maint: deprecated archival service (link)
  5. ^ Lexicon of Canadian Geologic Units. "Sawtooth Formation". Retrieved 2010-01-03.{{cite web}}: CS1 maint: deprecated archival service (link)
  6. ^ Lexicon of Canadian Geologic Units. "Piper Formation". Retrieved 2010-01-03.{{cite web}}: CS1 maint: deprecated archival service (link)

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