Two decades ago, an anthropology professor at the University of Utah asked the National Science Foundation to fund research on Native American ancestors to determine when the cultivations of crops like corn first became prevalent in their cultures.

The studies, according to the research proposals, would involve analyzing Ancestral Pueblo remains that museums had excavated around 1900 from some of the Southwest’s most sacred sites: a deep rift that winds through Bears Ears National Monument in Utah, an ancient village near cliff dwellings in Colorado and the remnants of a settlement at Chaco Canyon in New Mexico that dates back more than a thousand years. Nearly all of the remains were held at Harvard University’s Peabody Museum of Archaeology and Ethnology and the American Museum of Natural History in New York.

The analysis would destroy portions of the ancestral remains but yield valuable information, including a more precise date of when the individuals lived, Joan Brenner Coltrain, the Utah professor, said in the research proposals. This information could help the institutions finally return the remains to descendant tribes, she said at the time.