I wonder if Mr. Olmstead was in the P.C.U.S.A.(which I have affectionally referred to as both the “Pagan Church USA” or the “Lesbyterian Church”) or in the B.P.C., P.C.A., O.P.C., E.P.C. or A.R.P.(Presbyterian denominations that actually believe in Biblical orthodoxy).
I don’t see how he could have been ordained in a body that subscribed to the WCF - his improper marriage should have forestalled that. So the most likely candidates are the PCUSA or the one of the Cumberland bodies.