The Geological Survey of North Carolina has made a series of quite detailed geologic maps. The general geologic map of the state (detail of Durham below) is quite detailed but easy to figure out though you may need a plugin to use it. The other two maps are less easy for the non-geologist to figure out but are detailed down to the 1:24,000 USGS quadrangle (unfortunately only available now for SE and SW Durham). On the large map note the north-west part of Durham between 15-501/Hillsborough Rd. and the Orange county line where the Durham Triassic basin ends and older rock begins to show.
General Geologic Map
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SE Durham Quad
Full View
SW Durham Quad
Full View
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