Nechako River Map-Area

crumbly and badly slumped bed possibly 50 feet thick. Farther downstream
fragments of a white or cream-coloured diatomite occurred in the valley bottom,
presumably a part of the sedimentary section below the pumice. The position of
the diatomite below the plateau basalts is similar to that of the diatomite near
Quesnel, British Columbia (Tipper, 1959b). Deposits of diatomite and pumice
may be extensive in the Tsacha Lake area below the plateau basalts but such
soft sediments are generally obscured by drift.