I know that you posted this about 8 years ago, and you may have already found your ancestor Norris Marshall.
I ran across a Norris Marshall in Orange county, Vermont yesterday, while doing research on my Marshall ancestors.
There are a lot of marriage records for Marshall's in Orange county, Vermont. ...listed on the familysearch.org website.
Good luck with your search...as I have been working on my Marshall line for over 3 years.
My John Marshall and Elizabeth White married in Newington, Rockingham, New Hampshire on 4 Oct 1745.
The marriage record said that John Marshall was from Portsmouth...but there are many confusing records.
K S Marshall