Originally Posted by red56
.. my only guess is this is the main area for the leak.
Don't guess....that gets expensive
Take the time to get in there with some degreaser/brakecleaner and clean the old oil off. Then take it for a drive and check it again.
For a small fee a shop can put a little vial of fluorescent dye in the oil. You drive it and they hit it with a black light. The path the oil's coming from will leave a bright line, visible with the black light. Oil doesn't run uphill, so if the oil above the rear main glows, it's coming from higher up.
It could be something as easy and cheap as a leak at the back of the valve cover. That will usually run down the back and can look like a rear main leaking.
Could very well be the rear main but it would suck to shell out to have it replaced and still have a leak that's coming from higher up.