Abstract: Eight lithofacies types have been identified. These include: 1) Gms - massive, matrix support conglomerate; 2) Gm - massive or crudely bedded, clast supported conglomerate; 3) Sr - rippled sandstone; 4) Sp - planar crossbedded sandstone; 5) Sh - massive sandstone; 6) F1 - laminated sandstone, siltstone and mudstone; 7) Fsc - laminated or massive siltstone and mudstone; and 8) L - limestone. All lithofacies are present in the Sixtymile River area, but only lithofacies Sp, Sh and F1 were observed in the Grayling Creek area.

The eight types are grouped into four assemblages and are interpreted as: 1) Scott type braided river deposits; 2) Donjek type braided river deposits; 3) South Saskatchewan type braided river deposits; and 4) lacustrine deposits.

Lithofacies assemblages are arranged into at least ten fining-upward and thinning-upward megacycles reflecting a history of pulsed and rapid uplift in the source area.

Authors: Lowey, G.

Map Scale: 1 : 0

NTS Mapsheet(s): 115N, 115O

Citation: Lowey, G., 1983. Report of 1982 field work on Early Tertiary clastics, west-central Yukon. In: Yukon Exploration and Geology 1982, Yukon Geological Survey , Indian & Northern Affairs Canada/Department of Indian & Northern Development: Exploration & Geological Services Division, 34-37.