There are also strange outcrops in the columnar jointing at the edge of the dolerite sill on Bishop Hill, most notably Carlin Maggie.
22.
"' Columnar jointing "'is a distinctive type of joints that join together at triple junctions either at or about 120?angles.
23.
At the western end of the quarry is a unique exposure which displays columnar jointing in the sill with limestone exposed above and below the intrusion.
24.
"' Columnar jointing "'is a geological structure where sets of intersecting closely spaced fractures, referred to as prisms, or columns.
25.
Named descriptively following British Antarctic Survey ( BAS ) geological work on the island, 1985 86, from the excellent columnar jointing exhibited on the feature.
26.
Columnar jointing is present all through the most recent basalt lava flow and pillow basalts exist in the lowermost unit, portions of which are underlain by hyaloclastite breccia.
27.
Gently dipping lavas from the volcanoes cover most of northern Skye, giving a stepped columnar jointing, such as in the upper part of the Kilt Rock at Staffin.
28.
Other well-known columnar jointing formations are seen at the Giant's Causeway in Northern Ireland, Devil's Tower in Wyoming, United States and on the island of Staffa in Scotland.
29.
Some famous locations in the United States where columnar jointing can be found are the Devils Tower in Wyoming, the Devils Postpile in California and the Columbia River flood basalts in Oregon, Washington and Idaho.
30.
The Devils Honeycomb is a smaller example of the sort of columnar jointing found at Devils Tower National Monument in Wyoming, Devils Postpile National Monument in California, and the Giant's Causeway near Bushmills, Northern Ireland.
