Notifying and Authenticating marriage certificate for S1 type.

I have been appointed to teach at an International College in China. The college will apply for a Z type for me and an S1 type for my wife. We have been asked to provide a copy of our marriage certificate that has been notarized and authenticated.
My understanding is the notarization of the marriage certificate (in Australia) is undertaken by the Department of Foreign Affairs and Trade and the Chinese consulate (or Embassy) will then authenticate the Marriage Certificate and notarization.
All original documents are to be provided within 30 days to substantiate the Z and S1 visa's, once we arrive in China.
Is this correct.
Thank You.
Michael
Australia.