Augering Results

We have tried to make sense of the results of augering by plotting the layers within our mapping project using QGIS and analysing them with a useful plug-in (‘Midvatten’) originally designed and intended to record the stratigraphy and hydrology from well boreholes.  While most of the hydrology functionality is of no relevance, the associated database and the display features are ideal for producing a display which we hope can be used to interpret past topography of our site at Millhams.  So far our augering has generally terminated when we reach a gravel layer which resists penetration from our hand auger tool.  Intermediate results our confusing, giving a complex picture of  inter-penetrating layers of silty- sand of various colours from orange to blue-grey.  A typical Midvatten plot from Auger Line 1 is shown in the illustration, representing a horizontal scale of some 40m, with a greatly exaggerated vertical scale; the topsoil is shown in yellow with the impenetrable gravel layer in green.  Noteworthy is the evidence of an ancient channel running through the site, with the edge of the gravel a little further to the east.Midvatten_Au01

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