Sandstone cylinders with an average diameter of 10 centimeters cut depositional structures of the host beds in the lower Old Red sandstone of Shropshire, England. The pipes are ascribed to upwelling of ground water through unconsolidated deposits to reach the depositional surface, causing the formation of tubular ducts which became plugged probably as a result of changes in velocity of water flow relative to the settling velocity of material being eroded by the flow. These structures are classed with sand and mud volcanoes, spring pits, and other cylindrical structures from sandstone deposits.

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