|Mt St Helens before and after (USGS images)|
But often we Brits think of that as something which happens in other lands. But actually there are signs of change in counties like Norfolk and Lincolnshire. Near to Cromer, several villages named in the Domesday Book or other more recent records are now up to half a kilometre out to sea. There is evidence that the Lincolnshire coast was, until the 13th century, protected by a chain of offshore barrier islands. The demise of these in a series of storm surges drastically altered the coastline and its vulnerability to the sea. But despite these signs here in our own land that our not-so-distant ancestors walked across a different landscape, it takes a bit of adjustment.
Now, 8000 BC is not all that long ago, really - the Neolithic Age, and so the beginnings of recognisably complex society started not all that much later, around 5000 BC. And although the vertical movement of land in any one year is tiny - perhaps a few millimetres - over the course of a century it adds up. Our Neolithic and Bronze Age ancestors in some parts of the country experienced quite different terrain.
|Aerial view of the Scilly Isles (Wiki)|
|Tidally submerged field wall, Samson, Scilly Isles|
As well as simply projecting backwards the change in sea level, at a rate of 30 centimetres per century, we can look back at history. We know that in 1127, Tresco and Bryher were still a single island, with the two names referring simply to internal parish divisions. By 1600 they were separate, and the Grimsby Sound between them had become a sheltered haven for ships. The transition did not take many generations, and you have to wonder what the occupants made of the stories of their ancestors.The central area between St Mary's and the northern cluster of islands probably flooded around 6-700AD. On the other side of the country, ship burials were happening at Sutton Hoo.
But a change of 30 centimetres per century disguises the more dramatic way in which these events unfolded. This figure comes into perspective when you remember that the tidal range in a big spring tide on Scilly is around six metres. During a winter storm, waves coming across the Atlantic sometimes break over the top of the Bishop Rock lighthouse, some fifty metres high. The changes to separate island from island have not always been the result of a steady trickle of rising water; some will have been dramatic, cataclysmic events.
|Samson, Scilly Isles - still one island at present...|
From a fictional point of view, these kinds of gradual changes to the land itself offer a new storytelling dimension. Authors have explored - and I hope will continue to explore - sudden changes like the eruption of Vesuvius, or various earthquakes. Gradual change has not, I think, been used nearly so often. It could perhaps make for an interesting historical plot based on prehistoric Doggerland, in today's North Sea. Or a speculative fiction story where diminishing land serves as a variation on resource failure. It's worth remembering that the terrain we see today is not eternally fixed - even in this green and pleasant land - and has its own changing history.
About the author:
Richard Abbott is one of the reviewers at The Review, and lives in London, England. He writes science fiction about our solar system in the fairly near future, and also historical fiction set in the ancient Middle East - Egypt, Syria, Canaan and Israel.
When not writing words or computer code, he enjoys spending time with family, walking, and wildlife, ideally combining all three pursuits in the English Lake District. He is the author of In a Milk and Honeyed Land, Scenes From a Life, The Flame Before Us - and most recently Far from the Spaceports. and Timing. He can be found at his website or blog, on Google+, Goodreads, Facebook and Twitter.