 By 1899, the sandstone shaft marker placed by Chandler Robbins in 1875 had been disturbed and broken, so it was replaced with a new stone by two U.S. Surveyors, Hubert D. Page and James M. Lentz.In 1912, a simple concrete pad was poured around the marker.The first modern Navajo government convened in 1923 in an effort to organize and regulate an increasing amount of oil exploration activities on Navajo lands, and they would play a big role in the monument's further development.