In 1897, Marietta and Richard moved to the Chaco Canyon in New Mexico. However, she was more interested in the traditions and daily lives of the living Navajo than searching for the graves of ancient peoples. She spoke the
Navajo language fluently. In addition to running the Wetherill household, Marietta spent much of her time exploring. She made friends with many of the Navajo women and men living in the area. She visited them, supplied them with food, and learned from them. They mutually assisted each other with their births and in other urgent medical situations; since there were no medical professionals in the area, this help could mean the difference between life and death. In return, the Navajos shared their stories with her. Marietta was upset by the Compulsory Indian Education Act. She assisted several Navajos in locating their children by writing letters to the school authorities, and tracking down missing children. Often the children had died while separated from their parents. In 1905, Marietta, Richard, and his brother, Winslow, displayed an exhibition at the
St. Louis World's Fair. They brought 16 Navajo with them to St. Louis, who demonstrated their dancing, silver-making and blanket-weaving techniques. The Wetherills’ ranch came to comprise approximately 1000 acres. In addition to their ranching activities, the Wetherills maintained a trading post, trading in sheep and goatskins, livestock, silver, and Native artifacts such as blankets, baskets, and arrowheads. Richard (and occasionally Marietta) also guided teams of explorers and amateur archaeologists in their search for the remains of ancient Native peoples. From 1896 to 1901, the Wetherills were closely associated with the
Hyde Exploring Expedition. Marietta kept the records of the discoveries made and the items that were looted. She worked with Dr.
Aleš Hrdlička from 1899 until 1904, assisting him in his efforts to determine the Navajos’ racial origins. == Children ==