Evangeline Parish must be the true border country between the Rural Creoles and the Cajuns. (Both Creole to me though but Cajuns are more Acadian/Creole)
Check these sites:
http://www.travelavoyelles.com/about.htm
"The French of Avoyelles is therefore derived from standard 1850 Parisian French and is different from the Acadian (Frenchmen) who are primarily in southwest Louisiana."
http://www.pctourism.org/
"Pointe Coupee's culture has, therefore, been Creole in formation, that is, having characteristics of the French and Africans, and mixtures of the two"
"and, though it is seldom heard today, the Pointe Coupee Creole dialect which was largely spoken by persons of all races in this community." (Brian Costello)