could be a number of things, timing seal,front or rear sump seal , im fairly sure its an alloy sump so that rules out rust unless its cracked, ie going over speed bumps tp fast. If it is alloy im sure its a sealer not a gasket, sump plug washer would be a slight drip certainly not requiring a bowl.
The other thing you need to consider depending where its leaking is wether its contaminating the timing belt, it will fail if left for to long !!!...