dikes

Dikes are sheetlike igneous bodies of rock that intrude through preexisting rock, ranging is size from a fraction of an inch to over 30 feet in width.They usually occur perpendicular or nearly perpendicular to existing rock bedding.  Often, they are found in sets of several parallel dikes. When there is a large number of dikes in a given area, this is referred to as a dike swarm.

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