Type Locality:

In and along the stream bed of One Ten Creek, adjacent to the Alaska Highway west of Mount St. Paul in the Tuchodi Lakes (94K) map-area of northeastern British Columbia. Geographical coordinates of the type section: 58 deg 41'N, 124 deg 48'W.

Distribution:

Widespread throughout the northern Rocky Mountains of British Columbia, the formation can be traced from a feather edge onlapping the Alberta and Peace River arches just north of Monkman Lake [in Monkman Pass (93I) map-area] to the shale transition south of Beaver River in the LaBiche (95C) map-area. Approximately 400 m (1,312 ft) thick at the type section, the formation thickens westerly to approximately 600 m (1,968 ft) near Muncho Lake.

Locality Data:

Thickness(m): Maximum 600, Typical 400.

Lithology:

In the type area a sequence of intertidal, very light grey aphanitic dolomites and dolomite breccias. South from Mount Mary Henry [Tuchodi Lakes (94K) map-area] floating quartz sand grains are common in the lower three quarters of the formation to the degree that they dominate the lithology in the Halfway (94B) map-area north of Peace River. Accompanied by color change from very light grey to tan and change of bedding character to very well-bedded alternation of sand-rich and sand-poor dolomites, the lower Stone becomes a distinctive map-unit there. West of the type area the intertidal dolomites pass into subtidal fine-crystalline dolomites with minor interbedded limestones.

Relationship:

Unconformably overlies the Wokkpash Formation in the type area and older units, where onlapping of the Peace River and Alberta arches can be demonstrated. At the type area and southward is disconformably overlain by the Dunedin Formation. West and north of the type area becomes conformable with the overlying Dunedin Formation. Passes laterally in the subsurface of northeast British Columbia into the lower part of the Chinchaga Formation, and westwards into equivalent shales. Probable correlative of the Arnica and Bear Rock formations of the Northwest Territories.

Other Citations:

Griffin, 1967; Taylor, 1967; Taylor and MacKenzie, 1970; Taylor and Stott, 1973.

References:

Taylor, G.C. and MacKenzie, W.S., 1970. Devonian stratigraphy of northeastern British Columbia; Geological Survey of Canada, Bulletin 186, 62 p.

Taylor, G.C., 1967b. Surface Devonian stratigraphy of northwest British Columbia. In. Abstracts, International Symposium on the Devonian System. Alberta Soc Petrol. Geol., p.148.