Actually, Typically that's the headgasket (I had the same leak), Over time the headbolts stretch and the drain back holes leak, I've heard you can re-torque the headbolts to stop it but I imagine since the seal is already compromised it will just slow how much it leaks, With as much gunk is caked on i'm sure the cam seal leaks too but when these things get high in mileage they usually leak out that very corner.
ps Clean that block and fix that coolant leak too :thumbs up