Siouan glottochronology in 1804

[Alan H. Hartley]

W. Clark in Jrnls. Lewis & Clark Exped. 3.32:

"This Great Nation who the French has given the nickname of Sciouex,
Call them selves _Dar co tar_[.] their language is not peculiarly their
own, they Speak a great number of words, which is the same in every
respect with the Maha, Poncaser, Osarge & Kanzies. which Clearly proves
that those nation at Some Period not more than a century or two past the
Same nation"

Alan

P.S. Is the -s- in Poncaser real? (The -r is simply the reverse spelling
of a hard-core nonrhotic speaker; see also Osarge.)