I have created a .shp file of slopes over a range land environment. The goal is to identify any slope over 15% and remove it form the file to calculate graze-able acres. The attached file show a zoomed in area where white no data area encircles flat land(basically a butt or plateau). Obviously grazing animals can not get to the top of the butt to graze but its flat so it shows up as graze-able. I need to find a way to identify and remove all these areas.