In April 2013 scientists associated with the British Geological Survey (BGS) and the National Museums of Scotland announced the TW:eed project (Tetrapod World: early evolution and diversification). This project includes collaborators from across the UK, and aims to gather knowledge on the end-Devonian Early-Carboniferous world. One aim has been to drill a continuous 500-meter borehole at an undisclosed location near Berwick-upon-Tweed. This has produced a complete, centimetre-scale sampling of Tournaisian sediment, without discontinuities, providing a timeline on which fossil discoveries can be accurately placed. In the most recent paper to be produced by the TW:eed team, they announced some initial results from the core, including the apparent lack of oxygen excursion across Romer's Gap. This suggests that previous theories about low oxygen being the cause of Romer's Gap will need to be re-evaluated.