Baker reassigned it as the upper formation of Glen Canyon Group in 1936 .
The Navajo Sandstone was originally named as the uppermost formation of the La Plata Group by Gregory and Stone in 1917 .
Baker reassigned Navajo Sandstone as the upper formation of Glen Canyon Group in 1936 .
The Navajo Sandstone was originally named as the uppermost formation of the La Plata Group by Gregory and Stone in 1917 .