Need Help With Old Markings ???

[DolanDave]

Came across 2 old markings was wondering if anyone knew what it represents? Thank you...

 

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[Gulf Coast Pirate]

Came across 2 old markings was wondering if anyone knew what it represents? Thank you...

The first is earth and the second is iron.

 

[sdcfia]

The second may be pointing to a fairly close, but obscure location of a surveyor's benchmark.

 

[Sean shar]

It would have been better if you put the measurements