"Fossil evidence says 'yes'"?

Magic 8-Ball says "Reply Hazy, Try Again."

In addition, the second photo is marked "Destroyed", indicating that the benchmark has been irreparably damaged or obliterated.

The Ordinance Survey, from what I know of it, tends to use engraved benchmarks in walls and concrete structures. The USGS (and USC&GS) standard is a bronze disk set into a drill hole in a durable structure or concrete base, though older benchmarks could be drill holes, metal rods, or bolts.

Waypoints are sets of horizontal and/or vertical coordinates. Physical waypoint reference marks/monuments are called "benchmarks" in surveying.