edge as shown in fig8 their design can be of any shape and in fact can even be alignment marks that assist in positioning the mat sections without interlocking if the mat sections are laid out in the pattern of fig3 the registering elements are all utilized however if laid out in the staggered design of fig4 to have larger sections of the mat sections adhering to each other certain of the male elements 22 could be sheared off it can be noted that the notched registering design of fig8 does not lend itself to the mat section layout of fig4 fig6 and 7 illustrate treatment of the mat assembly 12 where it attaches to a wall 38 of the stall a coved baseboard 40 that is preferably an extruded length of an appropriate material is first glued to the mat assembly 12 and wall 38 and then screwed to the wall as shown in effect the mat assembly 12 then becomes a wall to wall covering over the entire stall and is retained at its edges to the opposing walls of the stall at the entrance or doorway into the stall a threshold 42 can be glued to a portion of the mat assembly and extend to or into the entrance preferably a wood cross.