Geosphere; February 2008; v. 4; no. 1;
p. 247-259; DOI: 10.1130/GES00139.1
© Geological Society of America
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Figure 7. Orientation of the fracture planes in thin sandstone beds in area 2, Big Rock Quarry. The relatively close spacing of the fractures in these thinner (centimeter- to decimeter-thick) sandstone beds is consistent with the relatively small bed thickness. (A) Picture of the outcrop showing fractured sandstone beds. This part of the outcrop is positioned at 
20 m below the part analyzed in Figure 6. (B) Virtual model of the part of the outcrop represented in part A. The point cloud mapping the fracture planes oriented NW is shown in green. (C–D). Surface classification analysis identifies the following three orientations: NNW (yellow), NE (red), and NW (green). Due to the high volume of data, this region of the outcrop has been divided in two parts (left [C] and right [D]) for analysis. (E–F) Equal-area stereographic projections of poles to fracture planes (the colors correspond to the identified orientations). The position of the mean vectors is plotted on the stereonet as a circle.
Copyright © 2008 by Geological Society of America
