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Searching for BM's by age

Green Toad

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Well, you also have the problem of what you mean by "age". Some marks are a lot older than is indicated by their official (Monumented) dates. For example, KV4984 (Sandy Hook, NJ Lighthouse) was monumented (observed) in 1835, but was constructed in 1764. HU1686 (Bound Mon E-W 20 DE-MD) was set in 1751 or 52, but not monumented until the 20th Century. If you are talking about absolute age, you often have to consult sources other than NGS or Geocaching to get pre-monumented history. Two good sources are the Delaware Geological Society at www.udel.edu/dgs and the Mason-Dixon Line Preservation Partnership (MDLPP) at www.eawebview.com/masondixon/mdlpp.

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