This wall-likefeature is a left over from a plumbing system of an ancient volcano and iscalled a dyk
This wall-likefeature is a left over from a plumbing system of an ancient volcano and iscalled a dyke or dike. When this volcano was active, this dyke wouldhave served as a duct through which magma was transport to feed the surface lavaeruption, or alternatively it could have been an off-shoot from the magma chamberthat froze up within a body of a volcano. Now, ~15 millionyears later the erosion has removed much of this volcano and so its internal magmaplumbing system is nicely exposed and is dominated hard crystalline rocks whichare much harder to erode. Thanks to this contrast in erosion we have abeautiful landscape of the Warrumbungle National Park. -- source link
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