What is this?

[Richard Tanimura]

I found this broken gasket while changing my timing belt and v-belts on my
3B (I5 type motor)

http://www.geocities.com/rictan302/gasket.JPG

It's 80 mm in diameter = 3 in. If you slice throught the gasket, it has a
"V" cross section. There are traces of caked oil on it. All I know is since
I discovered it, my car leaks oil.

Where does it come from? Can it be the reason for my oil leak?

Rich