Most likely candidate for this oil leak is the rear main oil seal. Other candidates are the oil pump O-ring and the fromt transmission seal. No gaskets up there that would be a simple fix. You might as well start planning right now that this is going top be one of your Winter projects. You could put it off for quit a while but it will not get better on it's own. It will be getting worse actually.
Never memorize something you can look up.