Date of Aurelius Surus\' Tombstone

[Arahne]

The position of tombstone find does not necessarily mean that there was original grave find.
Yes, necropolises are always extra muros, not intra muros. In fact it is usual that necropolis is located along the main roads.
Regarding elite parts of necropolis, You can make such comparisons only if You have completely excavated site, and even then You will not find similarities with modern large cities necropolises.
Regarding paleography, used script is also common in III century inscriptions.