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A closed line with hachures marking a collapsed crater.
Also known as: Caldera symbol, Collapse crater symbol
On a geological map a caldera is drawn as a closed line with hachures pointing inward, marking the rim of a basin formed where a volcano collapsed into its emptied chamber.
Marks the rim of a caldera, the hachures pointing into the depression.
Contexts: Maps
Uses inward hachures, the general cartographic convention for a depression, which distinguishes it from a hill drawn with the same closed outline.
Contexts: Maps
A roughly circular closed line with short hachures projecting inward from it towards the enclosed depression.