Hi Susan,
Progress report...
No sign of any grave stones at the Dalton Parish cemetery for a James Lockerbie (by) or Janette (Jean) Gilchrist or any of the siblings.
I have vsited the new Lochmaben cemetery and found some Lockerbie's (by's) which may be your relations. I have photos of their graves and shall post them as soon as I have downloaded them from my camera and transribed them for you.
On reflection, given that the James and Janette were married around 1800, if the lived and died pre 1860s in the Lochmaben parish, they would probably be buried in the old Kirkyard, which I shall visit next dryish day I have spare. The old kirkyard is quite overgrown and has a few broken stones I am told, so fingers crossed.
I'll keep you posted...
Best wishes,
Kojak :-)