Rhotacism in Norse

[Brian M. Scott]

DLW> I cannot find among my home sources here when it was that rhotacism of
DLW> final /z/ occurred in Norse, leading to the characteristically Norse
DLW> profusion of /-r/.  More precisely, when is it that the original two
DLW> runes begin to be confused?  Does anyone out there know?

Einar Haugen (Scandinavian Language Structures: A Comparative
Historical Survey) says that /R/ (from /z/) had merged with /r/ by
900-1100, as shown by runic evidence.

Brian M. Scott