In one embodiment, the face mat has a relatively short floor portion for extension into the earthen formation and an upright portion of an extended height for disposition over {HEAD ~ the face} of {TAIL ~ the formation} 
of
In one embodiment , the face mat has a relatively short floor portion for extension into the earthen formation and an upright portion of an extended height for disposition over { HEAD ~ the face } of { TAIL ~ the formation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL