FIG. 1 is a top plan view of a surfacing unit showing our new design;
FIG. 2 is an elevational view taken along line 2--2 in FIG. 1;
FIG. 3 is an elevational view taken along line 3--3 in FIG. 1;
FIG. 4 is an enlarged fragmentary top perspective view of a corner of the unit; and
FIG. 5 is a bottom plan view.
The characteristic features of our design are the side structures, including the slots and extensions.