Unit Name: Otter Park Member
Unit Type: Lithostratigraphic
Rank: Member
Status: Formal
Usage: Currently in use
Age Interval: Middle Devonian (397.5 - 385.3 ma)
Province/Territory: British Columbia; Northwest Territories

Originator: Gray and Kassube, 1963.

Type Locality:
West Nat et al. Fort Nelson, a-95-J centizone 95, block J, Nat Topographic Series map sheet 94-J-10 (N.E. British Columbia) between 2,020.8 and 2,185.4 m (6,630- 7,170 ft).

Distribution:
164.6 m (540 ft) in type section; it thins to the south. It is 149.4 m (490 ft) thick in Fort Nelson d-38-J, 33.5 m (110 ft) in Fort Nelson e-47-J and absent over the Clarke Lake Field.

Lithology:
Shale, medium dark grey to dark grey calcareous. The shale is more calcareous and has a higher resistivity and acoustic velocity than the Fort Simpson Fm. Limestone beds are rare or absent.

Relationship:
It is underlain by the Evie Member (Horn River Fm) and overlain by the Muskwa Member (Horn River Fm) except at the south on the north flank of the Clarke Lake Field where it is underlain by the Slave Point Fm. Where the Slave Point is fully developed the Otter Park is absent. It is the equivalent of the Slave Point, and probably the uppermost part of the Pine Point formations.

Other Citations:
Belyea and Norris, 1962; de Wit et al., 1973; Gray and Kassube, 1963; Griffin, 1967.

Source: GEOLOGICAL SURVEY OF CANADA, CALGARY
Contributor: L.V. Hills; A.W. Norris
Entry Reviewed: No
Name Set: Lithostratigraphic Lexicon
LastChange: 04 Nov 2004