Figure 22. Three oblique bathymetric views of the sea floor surrounding A, Lucas and Middle Ground Shoals, B, L’Hommedieu Shoal, and C, Hedge Fence Shoal illustrating places where the sandy Holocene components (LMSS, laterally migrating sand shoal) of each shoal are oriented obliquely to the trends of their underlying ice-marginal drift ridge cores (IMC). While achieving dynamic equilibrium in the presence of opposing tidal currents, the shoals have in places migrated sufficiently away from the underlying cores to expose them on the adjacent sea floor. White lines indicate the general trend of ice-marginal drift cores, and black arrows indicate shoal migration direction. The area depicted in each image is indicated by black polygons in figure 3.