Chemical analysis of 40 sherds excavated in the Osttor area reveal the homogeneity of the studied group. Foreign members to the group could not be identified. The samples were produced from a similar raw material and very probably at the same workshop. On the basis of these new data along with the previous ones (Jornet 1982), three reference groups of fine ceramic from Augst can be identified. Discriminant analysis allows for the distinction among them.