Showing the base of the mount(brownish slope),in relation to the ditch(around the pink flowers) around the base.
see http://homepage.mac.com/philipdavis/English%20sites/1171.html
see http://unlockingessex.essexcc.gov.uk/custom_pages/monument_detail.asp?content_page_id=89&monument_id=4269&content_parents=48