Columnar jointing
Columnar jointing is a geological structure where sets of intersecting closely spaced fractures, referred to as joints, result in the formation of a regular array of polygonal prisms, or columns. Columnar jointing occurs in many types of igneous rocks and forms as the rock cools and contracts. Columnar jointing can occur in cooling lava flows and ashflow tuffs (ignimbrites), as well as in some shallow intrusions. Columnar jointing also occurs rarely in sedimentary rocks if they have been heated by nearby hot magma.
BasaltCatoctin FormationCheakamus Valley basaltsColumnar jointColumnar jointedColumnar jointsColumnar structureColumnar structuresCymru TerraneDetunateleDiabaseElectroless nickel-boron platingEvidence of water on Mars found by Mars Reconnaissance OrbiterFlores_Island_(Azores)Geology of ArmeniaGeology of Hong KongHong Kong UNESCO Global GeoparkIce-marginal lava flowIgneous rockJoint (geology)
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Columnar jointing
Columnar jointing is a geological structure where sets of intersecting closely spaced fractures, referred to as joints, result in the formation of a regular array of polygonal prisms, or columns. Columnar jointing occurs in many types of igneous rocks and forms as the rock cools and contracts. Columnar jointing can occur in cooling lava flows and ashflow tuffs (ignimbrites), as well as in some shallow intrusions. Columnar jointing also occurs rarely in sedimentary rocks if they have been heated by nearby hot magma.
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Columnar jointing is a geologi ...... 6 sides being the most common.
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Columnar jointing is a geologi ...... en heated by nearby hot magma.
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Columnar jointing
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