Abstract

The production of Terra Sigillata imitations (TSI) from Nyon (south-west Switzerland) (15–30 A.D.) was studied from the chemical-mineralogical point of view, in order to define a new reference group and to prove if one piece stamped by the potter Fronto (ZA165) and found at the same place, was produced in the workshop of Nyon. Three Fronto stamped wasters found at Augst were compared with the local Nyon TSI in order to verify the possibility of the existence of two different workshops of this potter during the Gallo-Roman period. The analysed Nyon wasters may be divided into two groups, differing in CaO content. Most of the samples are characterised by high CaO concentrations and the Fronto stamped piece (ZA 165) is similar to this group. Nine samples form a small cluster characterised by lower CaO and MgO contents. Stamped wasters from Augst show a very different chemical pattern compared with the TSI of Nyon. One new reference group is proposed, consisting of CaO-rich samples from Nyon. Samples from Augst were certainly produced in a different workshop. The presence of two Fronto workshops is therefore presumed.

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