Columnar structure

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(Geol.)	a structure consisting of more or less regular columns, usually six-sided, but sometimes with eight or more sides. The columns are often fractured transversely, with a cup joint, showing a concave surface above. This structure is characteristic of certain igneous rocks, as basalt, and is due to contraction in cooling.<- as at Giant's Causeway, Ireland ->
	See under Columnar.

See also: Columnar Structure

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columella Subcolumnar			360) has compared the fissures by which the columnar structure seems to be determined, to the joints that traverse nearly all rocks, but which are best seen in the non-stratified masses. The Voyage of the Beagle by Darwin, Charles View in context			Columbiformes Columbin columbine columbite columbite-tantalite columbium Columbo columbous Columbus Columbus Day columella Columelliform column column chromatography column cover column dress column formation column gap column inch column length Column rule columnar columnar cell columnar epithelial cell columnar epithelium Columnar structure Columnarity Columnated columnea Columned columniation columniform columnist columnlike colure Colutea Colutea arborescens Colville Colwyn Bay coly Colymbiformes colza colza oil COM com- Com. Com. Ver. coma Coma Berenices comae comal			columnar columnar columnar alteration with prominent snouts and secretions Columnar basalt Columnar basalt columnar cell columnar cell columnar cell columnar cell Columnar Cell Variant of Papillary Carcinoma Columnar disposition Columnar epithelia Columnar epithelia Columnar epithelia columnar epithelial cell columnar epithelial cell columnar epithelial cell columnar epithelium columnar epithelium columnar epithelium Columnar Epithelium-Lined Oesophagus columnar ionization columnar jointing columnar layer columnar layer columnar layer columnar layer columnar resistance columnar section columnar stem Columnar structure Columnar Water Vapor Columnar Zone Radius columnar-lined esophagus columnar-lined oesophagus Columnar-to-Equiaxed Transition in Solidification columnaris disease Columnarity Columnated columnea columned columned columned columned columniation columniation columniform columnist columnist columnist Columnist Guild News Bureau Columnists Columnists Columnists Columnization columnlike Columns Columns Columns Columns columns of Bertin

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