Denton Record-Chronicle: EDITOR`S NOTE: Behind the Shale is a five-part series exploring urban gas drilling and one Argyle-area neighborhood`s struggle against it. Gene and Jennifer Cole stood in the backyard of their Argyle-area home, staring up at the mountain of rocks behind their fence, and then turned to a stranger in a black pickup. ‘What`s the problem?’ the stranger asked. It was not a simple question. For months, the Coles and their next-door neighbors, Jana and Darrin DeGrand, had …