Pettigrew frist came to Sioux Falls in 1869 at which time there were very few people in the upcoming town. He sensed the potential of the state and city and worked successfully to promote it and the state. Not surprisingly, he was a leader in the territorial legislature and later, in the US Senate.
Pettigrew also collected a large grouping of petrified wood and used some of it in a remodeling of his home. You can see the petrified wood on the right side of the house -- it looks like circular rocks. Shortly after he completed this, the collection of petrified wood was made illegal.