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Chimney Technical Terms
Chimney: A subsurface feature that forms a crude cone or wave-crest structure centered under a micro-high (e.g. a low mound or rim) and extending at least part-way under adjacent intermediate positions, composed of substratum material that appears to upwell and reaches close to the surface. A chimney is commonly bounded by master slickensides in the subsoil with maximum angles of dip reaching 60 - 75 degrees under the micro-high. Its morphology is distinct from the soil solum of the adjacent micro-lows (e.g. lighter colored and more alkaline and contain carbonate or gypsum concretions absent under micro-lows). Compare – puff [gilgai], bowl [gilgai], intermediate position [gilgai], gilgai. SW