My head spins when I am listening to Stan Riggs and Orrin Pilkey. They are legendary geologists. Both have been studying coastal N.C. for more than half a century. Last week I spent a couple days with the two of them on Ocracoke Island and Portsmouth Island. When I listen to them, my whole sense of time changes. History to them is a whole other thing. They look at the state's coastal plain and what they see is a quarry near the small town of Fountain, in Pitt County. The quarry’s rock is the same rock that you’d find in Dakar, Senegal, a relic of a time more than 200 million years ago when what’s now eastern N.C. and what’s now West Africa nuzzled together....