Tennessee's claim that it should continue to control the land stems from "acquiescence, " a concept in property law that it has the right to keep a boundary if it is not contested over a long period.

WSJ: In Latest War Between the States, Georgia Says Tennessee Is All Wet

Following a boundary review, 57 seats are being contested, down from 73 four years ago.

BBC: Northampton

Limiting peacekeepers to the south could complicate efforts to monitor the boundary, parts of which, including Abyei, are contested.

BBC: Ethiopia offers peacekeepers for Abyei in Sudan

The question is one of the most hotly contested in palaeontology and revolves around an apparent gap in the fossil record immediately prior to the K-T boundary - the distinct layer of geological sediments separating the Cretaceous and Tertiary periods, and associated with a massive asteroid impact and global extinction event.

BBC: Closing the 'three metre gap'