Systematic Paleontology

At least 11 sciurid phena were observed in this study, ranging in size from chipmunks (Tamias) to marmots (Marmota). I

interpret these phena as distinct species: at least one species each of chickaree (Tamiasciurus), chipmunk, and marmot; five species of ground squirrels (Spermophilus); and three species of prairie dogs (Cynomys) or prairie dog-like ground squirrels. The taxonomic sequence of the following accounts follows presumed phylogenetic relationships among sciurids in general (Hafner, 1984) and ground-dwelling sciurids in particular (Hafner, 1984; Goodwin and Hayes, 1994).

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