Hi Jack,
In order to have a chance of taking this line further back with any certainty, I think you would need to consult the original record. I am not convinced her surname is Sharon or Shasen. That seems like a best guess by the transcriber as there isn't anyone else that I can see in the area with a name like that. Based on the available records online it could be something like Shotton. There are is an Elizabeth Shotton baptised at Newcastle on 24 Jan 1675 to John, that's certainly a possibility.
That being said there is a baptism for a Thomas Chason to Ben. Chason, abode "Sh." (presumably Shields) at Tynemouth on 8 Apr 1695, so this could be related. These names don't appear to crop again though.
As it happens I am due to go to Northumberland Archives in the next couple of weeks, I can try and see if I can review the original entry for you as I will be digging through some other Northumberland parishes. That might shed some light - with the right surname the chances of finding her baptism are much better.
Based on her being in her twenties when she married, most of the surrounding parishes and Tynemouth itself would cover that period so if she was local, the record should be there. Notwithstanding any badly damaged or lost parish registers of course.
Lewis
