The question was raised of the meaning of the name "Mark" for a farm. It seems to have mainly been used in regard to a boundary point. Maybe the farm was at one end or corner of an estate, or had in its lands an old boundary stone, for example. But there's another possibility too, more usually spelled "Merk" and that would refer to land for which a rent of one Mark was owed. There is also at least one "Halfmark" in Galloway (in Carsphairn), and that's pretty clearly related to the rental. Crawford.