"stroke-width":1, "stroke": "#ff0000","stroke-opacity":0.5,"fill-opacity":0.5, "fill": "#ffffff", "title": "Elizabeth Reef" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 158.88333, -29.76667], [ 159.28333, -29.76667 ], [ 159.28333, -29.36667 ], [ 158.88333, -29.36667 ], [ 158.88333, -29.76667 ] ] ] } }, { "type": "Feature", "properties": { "stroke-width":1, "stroke": "#ff0000","stroke-opacity":0.5,"fill-opacity":0.5, "fill": "#ff0000", "title": "Heemskerck Seamount" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 159.30809, -36.07751], [ 158.90809, -36.07751 ], [ 158.90809, -36.47751 ], [ 159.30809, -36.47751 ], [ 159.30809, -36.07751 ] ] ] } }, { "type": "Feature", "properties": { "stroke-width":1, "stroke": "#ff0000","stroke-opacity":0.5,"fill-opacity":0.5, "fill": "#ff0000", "title": "Zeehaen Seamount" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 159.72079, -36.13855], [ 159.32079, -36.13855], [ 159.32079, -36.53855 ], [ 159.72079, -36.53855 ], [ 159.72079, -36.13855 ] ] ] } }, { "type": "Feature", "properties": { "stroke-width":1, "stroke": "#ff0000","stroke-opacity":0.5,"fill-opacity":0.5, "fill": "#ffffff", "title": "Ball's Pyramid" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 159.05167, -31.55417], [ 159.45167, -31.55417 ], [ 159.45167, -31.15417 ], [ 159.05167, -31.15417 ], [ 159.05167, -31.55417 ] ] ] } } ]} ] Geology The Gifford guyots are two flat‐topped basaltic seamounts, now caped with carbonate sediments with the larger Gifford Guyot dated at 15.6 million years ago but the smaller unnamed seamount of unknown age. They both raise from an abyssal plain below sea level to generally flat summits that are about below sea level. This summit plateau is about for the unnamed guyot), and in area for Gifford Guyot itself. See also Gifford Marine Park References Guyots Hotspot tracks Volcanoes of Zealandia Seamounts of the Pacific Ocean Seamounts of the Tasman Sea