On the 1871 birth cert of Marion Barr McMillan Crichton it shows her parents as James Crichton and Margaret Girtridge, seemingly married on 13th June 1851, Newton on Ayr (it says). I have tried every which way to find these folks, but with no success.
I have found them mentioned in several databeses, but only as Marion's parents - no sign of a marriage certificate. As it was the mother who registered the birth I (possibly incorrectly) had assumed that the marriage date she gave was accurate. However, as she "marked" rather than actually signed, who knows?
P.S. No offence intended to our male members by my comment "<i>As it was the mother who registered the birth</i>"