Birth: Jul. 16, 1817
Death: Aug. 6, 1880

The Inscription Reads:
In Memory Of
(there is an Architect's logo/symbol)
John Flowers
Born: July 16 1817
Died: Aug 6 1880

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=Flowers&GSfn=John&GSbyrel=all&GSdyrel=all&GSst=12&GScnty=426&GScntry=4&GSob=n&GRid=75849953&df=all&

I am not sure if this is your ancestor.

http://38thga.com/drupal/node/44