studies. Furthermore, photogrammetry has been directly employed
for many years in the geosciences through stereoscopic viewing
and analysis of overlapping pairs of aerial photographs (e.g.,
Eardley, 1942; Pillmore, 1964). This stereoscopic viewing provides
the researcher with the ability to visualize and map a study area
remotely and from a perspective that is impossible to attain in the
field. These photogrammetric techniques were adapted for working
at the outcrop scale for simple visualization purposes by taking
photo pairs of the outcrop of interest for later viewing through a
mirror stereoscope (Kuenen, 1950).