A structure illustrated as a sand volcano in the recent textbook of Reineck and Singh (1973) is interpreted as a patterned conical pit formed by water welling up through unconsolidated coarse silt, i.e. , formed with geometry opposite that of a volcano. Corresponding pits with patterned sides have since been found in situ . The patterned cones and pits occur in sandstones assumed to have formed in a braided stream/floodplain environment, close to coarse alluvial fans, where it is very likely that artesian water could have been produced.

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