a) a welded wire face {TAIL ~ mat} having an upright portion of an extended height for disposition over a portion of {HEAD ~ the face} of the formation 
a ) a welded wire face { TAIL ~ mat } having an upright portion of an extended height for disposition over a portion of { HEAD ~ the face } of the formation
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH