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, but congeals around the vent, forming a small hill or mound on the surface.
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, but congeals around the vent, forming a small hill or mound on the surface.
Source: Wikipedia "Mamelon (volcanology)" · CC BY-SA 4.0
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