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 {HEAD ~ disposition} over {TAIL ~ the face} of the formation 
over
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 { HEAD ~ disposition } over { TAIL ~ the face } of 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 HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH