The results of this study provide a foraminiferal reference sequence for the Albian Stage in the Yukon Territory, a previously little-known region between the Alaskan North Slope and the Canadian Western Interior. Eighteen families, forty-three genera, and one hundred and thirty-five species of the order Foraminifera are reported from the Albian sequence. Several species recorded in previous publications are redescribed and illustrated; eighteen new species also are described and illustrated. Many of these new species names replace previously used informal designations. Agglutinated Foraminifera comprise 80 per cent of the recovered microfauna. Such forms are benthonic and are subjected to relatively high energy levels of current action. As a result of this, and because of prevailing less favourable marine conditions, the species undergo considerable morphological adaptation in order to survive. An explanation of such species variations is illustrated with six textfigures portraying morphological series within related taxa. Taxonomic parameters for several of the described species are shown to be partly subjective, and these require arbitrary divisions between two or more taxa within a morphological senes.