On a hunch, I took a look in my "Stark County, Ohio Death Records".These are early records.I found: WERT, Adam, d. 9 Jan 1870, married, a. 75y 16d, d. Navarre, b. Dauphin Co., PA, occupation Postmaster, resided Navarre, vol. 1 page 36. The cause of death isn't listed.
No Sarah Wert. No Sarah or Adam Wirt. No Wirth.
If this is your Adam Wert, he may not have a stone or a stone that can be read.I checked my other cemetery volumes and couldn't find anything.