Аннотация:Abstract Acoustic and video evidence suggest that Deg Xinag, an Athabaskan language, contains Rounding Assimilation, rounding of schwa before a stressed rounded vowel across uvular or laryngeal consonants. Although Rounding Assimilation has received no mention in previous Deg Xinag studies, it appears to be at stage II, phonologization, in the model of sound change proposed by Hyman (1976). Data from the related language Babine-Witsuwit'en is also presented, showing an absence of Rounding Assimilation in one of the contexts where it occurs in Deg Xinag. Babine-Witsuwit'en sheds light on how and why Rounding Assimilation may have developed historically in Deg Xinag.
