Blackberry Cobbler (or is it pie?)

My friends and I have had an ongoing debate about the difference between pie and cobbler.  This recipe is from the "A Taste of Georgia" recipe book published in 1977 by the Newnan Junior Service League.  It is called Blackberry Cobbler, but according to this website, I've been making it into Blackberry Pie because I put a pastry crust on the bottom!  All I know for sure is, this is THE BEST DESSERT ON THE PLANET!