Geophysical logging data from the Mills Gap Road area near Asheville, North Carolina

Geophysical logging and geologic mapping data in the vicinity of the GMH Electronics Superfund site near Roxboro, North Carolina

“…Because all lines extend in two directions, bedrock discontinuities were measured and recorded using the right-hand rule convention (strike azimuth is measured with the dip inclined toward the right). Two planar features assigned strikes that are parallel (for example, 45° and 225°) differ in that one feature dips to the southeast and the other to the northwest, respectively (Chapman and Huffman, 2011).…”

“…Vertical boreholes are statistically less likely to intersect steeply dipping planar features than more flat-lying features, whereas surface outcrops provide a relatively better sample of more steeply dipping features. With the exception of the rare steep cliff face or high roadcut, outcrops provide relatively less opportunity to count and measure flat-lying features than vertical boreholes (Chapman and Huffman (2011).…”

“…During surface mapping, geologists assign measurements to sets of features having a similar orientation. For any given map station, which may represent an entire outcrop or group of outcrops, one recorded measurement could represent a group of 1, 10, or 100 parallel similar joints or foliations (Chapman and Huffman, 2011). Table 3.…”

A science plan for a comprehensive assessment of water supply in the region underlain by fractured rock in Maryland

“…Geophysical logging methods have been used to determine major flow zones in fractured rock wells (Paillet and Ollila, 1995;Williams and others, 2002). In North Carolina and Georgia, geophysical logging studies in the Piedmont and Blue Ridge Provinces were conducted (Chapman and Huffman, 2011;McSwain and others, 2009;Williams and others, 2005). To date, only a small number of supply wells have had geophysical logs collected using these methods in Maryland.…”