[3] The Yahatinda Formation includes both terrestrial river channel and littoral marine sediments.

The channel deposits, which are well exposed at the type locality, consist of reddish, medium- to coarse-grained, cross-bedded dolomitic sandstones, siltstones, conglomerates and breccias.

The channels contain eroded cobbles and boulders from the older underlying formations, as well as the remains of land plants and freshwater fish.

The Yahatinda rests unconformably on formations that range in age from late Cambrian to early Ordovician.

It is equivalent in age to the upper part of the Elk Point Group in the basin to the east.