Fall had been dangered off & cribbed off for 3 months. When we drove through the area it was laminated sandstone with pressure from block of coal left in the room above the pressure causing the laminated sandstone to break up causing the rook fall in an intersection. Fall was approx 4' to 8' high, 18' wide and about 40' long in #6 intake entry, inby spad #6516 1 break.