Disocordant vertical new walls of intrusive igenous rock
magma forced up along cracks to force the intrustion into other cracks which opens new cracks due to high pressure within the rocks - this can produce many dykes - called a dyke swarm
they cut through layers instead of sills that go inbetween
contact metamorphism with other country rocks
basalctic or dolerite
can form rock walls when eroded
E.g Kildonan dyke swarm, Isle of Arran
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