into Devonian and Carboniferous faunas, suggesting that some tetrapods passed through the end Devonian extinction event unaffected." Tournaisian-age locations For many years after Romer's gap was first recognised, only two sites yielding Tournaisian-age tetrapod fossils were known; one is in East Lothian, Scotland, and another in Blue Beach, Nova Scotia, where in 1841, Sir William Logan, the first Director of the Geological Survey of Canada, found footprints from a tetrapod. Blue Beach maintains a fossil museum that displays hundreds of Tournaisian fossils, which continue to be found as the cliff erodes to reveal new fossils. In 2012, 350-million-year-old tetrapod remains from four new Tournaisian sites in Scotland were announced, including those from a primitive amphibian nicknamed "Ribbo". In 2016, five more species were unearthed from these localities, proving Scotland to be one of the most important sites in the world for understanding this time period. These localities are the coast of Burnmouth, the banks of the Whiteadder Water near Chirnside, the River Tweed near Coldstream, and the rocks near Tantallon Castle alongside the Firth of Forth. Fossils of both aquatic and terrestrial tetrapods are known from these localities, providing an important record of the transition between life in water and life on land and filling some of the lacunae in Romer's gap. These new localities may represent a larger fauna, as all lie within a short distance of each other and share many fishes with the nearby and contemporary Foulden fish bed locality (which has not produced tetrapods thus far). As with East Kirkton Quarry, tetrapods at these sites were discovered through the long-term efforts of Stan Wood and colleagues. 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 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