Abstract
Among the equid species named from the Cypress Hills Formation (Eocene to Miocene) of Saskatchewan,Mesohippus westoniandM. propinquusare documented from the early Chadronian Calf Creek local fauna, andM. westoniis also known from the earlier Southfork local fauna and from other Chadronian and Orellan deposits of western North America. Teeth possibly referable toMiohippus assiniboiensisare found in association with Whitneyan or early Arikareean assemblages.Miohippus grandis, notM. assiniboiensis, is the correct reference for larger Chadronian equids from Calf Creek and other local faunas.Archaeohippus stenolophus(new combination) is preserved in latest Arikareean or early Hemingfordian beds of the Cypress Hills, and occurs in faunal assemblages that show strong resemblances to the Runningwater assemblage of Nebraska.
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