Thesaurus Term/Concept: FUNDAMENTAL BENCH MARK

Identifier	160452
Class	MONUMENT TYPE
Status	Preferred
Index?	Yes
Scope Note	Used by Ordnance Survey to record high accuracy height above Ordnance Datum Newlyn. Marked by a low concrete pillar, and maybe surrounded by railings, they comprise an underground chamber protecting the reference point, built directly onto stable bedrock.

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