A big change for this period is evident in pottery construction. Instead of using sand or ground up rock for temper they used ground clam shells. The shape of their pots also changed from the pointed bottom of the Woodland people to a pot shaped more like a pumpkin. The designs on pots changed and now showed a similarity to the designs that Mississippian people made in southern Illinois. At many sites the only way that archaeologists know that the Mississippians have influenced Wisconsin's Woodland people is by the presence of Mississippian style pottery sherds.