The Hidden Landscape - A Journey into the Geological Past

'I travelled to Haverfordwest to get to the past. From Paddington Station a Great Western locomotive took me on a journey westwards from London further and further back into geological time, from the age of mammals to the age of trilobites... Under the River Severn and into Wales, I was back before the time of the dinosaurs, to a time when Wales steamed and sweated with the humid heat of moss-laden and boggy forests in coal-swamps, where dragonflies the size of hawks flitted in the mist; and then on back still further in time, so far back that life had not yet slithered or crawled upon the land from its aqueous nursery.'