The Halterman family settled in Runnells, Polk, Iowa in the 1800's. This is my mother's paternal side of the family. Many Haltermans are buried in the Warren-Powers Cemetery in the (used to be)town, called Adelphi. I will have to find out the earliest burial there, and let you know.
Here is a headstone of Irvin C. (Christian) Halterman. He is my mother's grandfather: