Admin boundary issues here. There are two townlands of the same name "Knockshangarry" split along here (along quarry N–S). This usually happens when civil parishes "split" townlands. This means the civil parish, EDs, and registrar boundaries should run along here and not along the road to the east. This would also solve a problem with "Bullaun Registrars District" split into two rings. 

I also noticed other general townland boundary issues inaccuracies in the area (going along road when boundary goes into field).

I suggest doublechecking boundaries in this area.