Human remains from 1909 to 1918 are not “ancient” in the sense that archaeologists usually use the term — they are relatively recent by the standards of ancient DNA work.

Under favorable preservation conditions, remains of this age would very likely contain extractable DNA.

The specific comparison needed in this case is between the genetic profile of the remains in question and the genetic profiles of known descendants of Geronimo.

For this comparison to be definitive, geneticists would need to choose the appropriate genetic markers.

The most useful markers for this purpose would be:

Y-chromosome analysis, if the remains are male and if the DNA from the Y chromosome is preserved.