Among one Neutral Iroquoian site cluster, potters produced a significant change in
tempering choices. Local sites exhibit almost no shell-tempered vessels up to A.D. 1600, but
communities from 1600-1650 show a marked increase in shell-tempering, representing up to
64% of one site’s assemblage. The appearance of shell-temper at Neutral sites makes firing
temperatures an important attribute to consider for local ceramic technological systems, as the
risk of ‘limespalling’ at temperatures above 650ºC presents a unique structural risk to vessels
made with this paste. We employed step-based oxidation analysis (sherd re-firing) and ceramic
petrography on body sherds from the 17 th century Christianson (AiHa-2) and Hamilton (AiHa-5) villages, located in Flamborough, Ontario. These analyses allowed us to examine how, and if,
firing regimes changed with the adoption of this new paste. Our findings also provide a broader
insight into the firing technologies of Late Woodland ceramics, an underexplored feature of
Iroquoian archaeology.