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HERDINGS WOOD - THE SITE GEOLOGY The rocks consist
of alternating bands of shale and sandstone, with shales generally being
dominant. The Meers Brook is
the main watercourse in the Gleadless Valley, through which it flows in
a mainly westerly direction. It is joined by a small tributary which runs
in a north-westerly direction through the western half of Herdings Wood.
Within the wood the Meersbrook is, like other streams in the Gleadless
Valley, generally shallow. It becomes much deeper and broader further
down the valley, the lowest stretch having some meanders, patches of mud
and silt, and relatively deep pools. SOILS Thin dry 'acidic soils' occur over sandstone, particularly on higher ground, as well as over shales on steep slopes. The depth and acidity of the soils is strongly affected by slope, with the thinnest and most acid soils being found on steeply sloping sites. Deeper and less acidic soils occur on flatter ground, even over sandstone. Neutral soils are mainly found on flat to moderately sloping ground over shales. They vary in depth and clay content and also from dry to seasonally wet, the wettest areas being on stream banks, in valley bottoms and by springs and wet nutrient rich areas known as flushes. Waterlogged soils
are found in association with streams, springs and flushes. They occur
mainly over shale, particularly where this meets sandstone strata. These
conditions occur on the valley slopes as well as in the valley bottoms
and by streams. Some of the springs are wet all year round but the flushes
are more seasonal. |