It was spoken by various bands of the Kalapuya peoples who inhabited the valley up through the middle of the 19th century.
The language is closely related to Northern Kalapuya, spoken in the Tualatin and Yamhill valleys.
Jacobs possibly notes that the plosives also have voiced allophones, as [b], [d], [ɡ], [ɡʷ], [ɢ], and [ɢʷ].
[4] Santiam Kalapuya had three diphthongs: [ai], [au], and [ui].
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