No I'm not sure it's a field boundary.
When I looked up close it seems to be two close barrows that had been ploughed together.
No signs of it being a long barrow, no stones or forecourt.
If it was a LB then it qualifies as the smallest in the country.
What impresses me is the views from various sites, especially walking up green st.
If you stop at summer cross lane it dominates the skyline.
I also use the term Falkner's barrows.
PeteG