> Do they have some surveyor's benchmarks at the corners now rather than a tree?

-Generally there are iron rods or pipes at the corners or sometimes a nail or spike driven
into the base of the original
tree (or tree stump).  There can be chiseled crosses or drill holes on rock or in concrete
posts set into the ground.  A 'PK' (name of
the manufacturer Parker-Kaplon) hardened steel  nail can be hammered into pavement.  I
have seen some markers that are
short railroad rails with a punch hold in the top or an axle from an old car or other
machinery.

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