Yes, Honey Creek Cemetery is in Llano Co.
I doubt Mark & Georgia divorced. They are in 1880 Llano Co census. He died in 1881 Llano Co, leaving her a widow. She remarries to August Mostiet in 1883 in Llano Co.

As for the marriage: M.A. Harvey married (shown in records as) G.A.Martin, 25 May 1871, Hays Co, TX. He can be found in the 1870 Hays Co census, so they apparently met & thus married there.