GPR Data:  Penny Hill and Snow Hill

Penny Hill is a barchan dune with an internal structure comprised of simple dune foreset strata that indicate a dune migration direction (SSW) slightly oblique to the N-S GPR line. This migration direction corresponds well with the sand transport direction predicted from the wind data plotted in the sand transport rose to the right. sand_rose.gif (6036 bytes)

ph_n-s.gif (86496 bytes)

ph_e-w.gif (79736 bytes)

Snow Hill is also a barchan dune, but because it is in the process of turning into a parabolic dune, the surficial topography and internal stratigraphy are not as simple as those of Penny Hill. However the overall migration direction is also SSW, especially visible from position 120-160 meters on the N-S GPR line. This migration direction also corresponds well with the sand transport direction predicted from the wind data plotted in the sand transport rose (above).

sh_n-s.gif (67480 bytes)

sh_e-w.gif (76601 bytes)