A mamelon (from French mamelon, "nipple") is a rock formation created by eruption of relatively thick or stiff lava through a narrow vent in the bedrock. Because the lava is not fluid, it does not flow away; instead it congeals around the vent, forming a small hill or mound on the surface. The outflow from successive eruptions forms additional layers on top, and the resulting pile of layers may stand over 100 metres (330 ft) above the surrounding surface. Hanging Rock in Australia is another example of a mamelon.
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