Sometime after 1750, an old millstone was transported from Philadelphia by ox cart and became the oldest known relic of the community. It was discovered in the old mill race at the site of the first grist mill along Loyalsock Creek by Milton F. Sheffer when he purchased that tract of land. Sheffer presented the stone to the borough and the school district at the time of the centennial celebration, and it was erected on this site by the centennial committee. The stone was presented through Charles V. Adams, who originated the idea of it as a memorial of early Montoursville.