In Missouri, "approved monumentation" is described in "2 CSR 90-60.060 Approved Monumentation"
AUTHORITY: sections 60.510(7) and 60.550, RSMo 1986 and 448.2-109, RSMo Supp. 1988.*
Original rule filed May 3, 1994, effective Dec. 30, 1994.
https://missourisurveyor.org/images/...378.pdf#page=4
In the contemplation of these rules, wooden stakes set above ground as temporary indications of the approximate location of approved monumentation do not qualify for any statutory protection. They are not legal monuments.
The links posted previously refer to the duties of County Surveyors and their official duties, primarily the preservation of the original US Government surveys done in the 1800's.