Using GCT how can I make a Map of regions of my site that have a particular material present?

Say I have 20 boreholes in my project file, and some have encountered Peat.  This is defined by a record on my STRATA_MAIN table which has a key set PointID,Depth and a field Geology_unit_1 which would be set to "Pt".  I'd like to make a map that shows the areas that have peat, perhaps the boundary is half way between boreholes that have peat and ones that do not.  I was told this can be done using ArcGIS, can it be done using GCT?

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