Chew Green Camp 4

As the Chew Green  camps overlap and descriptions are sometimes confusing,  it is appropriate to better define them. 
Camp 4 is built entirely within Camp 1.  It is thought to be a semi-permanent camp that was occupied for more than just a few days.
See:
http://roman-britain.co.uk/places/chew_green.htm
http://www.pastscape.org.uk/hob.aspx?hob_id