Secrets of evolution lie beneath Scotland’s soil

[The Scotsman]   There are a number of big questions in palaeontology, such as where and under what conditions did life first evolve; what caused the extinction of the dinosaurs; and what were the detailed steps in our own evolution? But one question has stood out for many years as a mystery: what did the earliest vertebrates (animals with backbones) look like, and under what conditions did they emerge on wto land?