The exaggerated profile plotter (fig. 1) was designed and
constructed for use with aerial photographs to aid in tracing and
correlating thin rock units between field measured stratigraphic sections.
Fig. 1. Exaggerated profile plotter
Problems in geologic mapping on the western flank of the Black Hills,
Wyoming, involving the identification, correlation, and tracing of
contacts between formational and intraformational units of the Lakota
and Fall River formations demonstrated the need and potential usefulness
of such an instrument.
The profile plotter is used with aerial photographs and a double-
projection type stereoscopic plotter to draw vertically enlarged profiles
that emphasize topographic detail which may reflect rock units,
structural detail, facies changes, and some surficial deposits.