Porphyry Bench -- 16B-18

1999 0 forward	1999 100 back	1999 200 forward	1999 400 back
2004 0 forward	2004 100 back	2004 200 forward	2004 400 back
*2010 0 forward	*2010 100 back	*2010 200 forward	*2010 400 back

* photos were taken in 2010 with corresponding data collected in 2009