2026-09-27T20:10:17+01:00https://marinefinds.org.uk/datalabs/terminology/object/format/jsonhttps://marinefinds.org.uk/datalabs/terminology/object/format/xmlhttps://marinefinds.org.uk/datalabs/terminology/object1067101614100058KEYSTONEYThe top stone of an arch which holds it all in place.128P3087137920KEYSTONEYThe wedge-shaped block placed at the crown of an arch to consolidate the structure. Sometimes employed as a decorative feature.546P