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. |