Type Locality:

On Whistler Creek near Peters Lake, eastern Brooks Range, Alaska (69 deg 19'N, 145 deg 09'W).

Distribution:

It ranges from 0-122 m (0-400 ft), in the eastern Brooks Range; 90 m (295 ft) at the type section. It is several hundred feet thick 19 km (12 mi) west of Sam Lake and about 18 m (60 ft) at the junction of Trail River and Gravel Creek in the Yukon. This formation is widespread north of the Brooks Range Divide and east of the Canning River, Alaska. It is continuous from the Canning River to just east of the type section, then it becomes discontinuous to the vicinity of the Yukon-Alaska Boundary at Joe Creek. It is present west of Sam Lake (68 deg 28'N, 138 deg 40'W), Yukon, and in the vicinity of the junction of the Trail River and Gravel Creek (Barns and British mountains areas). It is also possibly present in the Bonnet Lake area (Jeletzky, 1971).

Lithology:

The formation consists of thin conglomerate composed of subangular to rounded granules, pebbles and cobbles of black, white and grey chert, quartz, quartzite and siltstone and grey coarse-grained quartzitic sandstone. May include thin seams of coal. In the Yukon it consists of quartz, chert and quartzite clasts in a quartzose matrix.

Relationship:

In the type area it lies with angular unconformity on the Neruokpuk Fm and is conformably overlain by the Kayak (?) Fm.

Other Citations:

A.K. Armstrong and Mamet, 1974; Brosgé at al., 1962; Jeletzky, 1971; Miall, 1973.