This is a top down picture of an early USGS vertical control marker pipe cap, apart of the NOGLS (Nogales) datum, located just east of the Union Pacific "Gila Subdivision" line, I-10, and the Casa Grande Highway (I-10 frontage road), which used to be AZ 84. The marker is just south of Red Rock, Arizona. The marker is at a section corner, with the section corner marker only a few feet away from the USGS marker. The marker was placed in 1903.
<a href="//commons.wikimedia.org/wiki/User:BubbaJuice" title="User:BubbaJuice">BubbaJuice</a>
2022-07-31 15:11:39
<span class="int-own-work" lang="en">Own work</span>