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That pipe is 1. a generally small, sub-cylindrical, vertical hole developed in an unconsolidated sedimentary deposit by the washing away of all or part of its fines content. some pipes develop above points on a carbonate-rock surface, such as joint intersections, where ground-water seepage is locally concentrated. pipes in chalk include cylindrical and conical masses of clay and sand that are neptunian fills of dissolutional dolines, shafts and caves; all shapes and sizes are commonly referred to as chalk pipes [9]. 2. small cylindrical hole in unconsolidated sediments, caused by removal of fine material by water [10]. 3. a closed tubular conduit for fluid transport [16].?

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