A Journey through Geopark Shetland

In September 2009, the Shetland Islands were awarded the accolade of becoming the thirty-fifth European Geopark. This is fantastic news for the isles. It acknowledges the importance of Shetland’s incredible geology and creates opportunities to promote it to an international market and develop partnerships with other members.

When visiting, the best place to start your journey into Shetland’s ancient past is at Shetland Museum, in Lerwick. Here, displays take you back into the mists of time, revealing vanished landscapes and the amazing events behind them. All across Shetland, the rocks and landscapes tell an endless story – of oceans opening and closing, of mountain building and erosion, of ice ages and tropical seas, volcanoes, deserts and ancient rivers, of land use, climate change and sea level rise, and of minerals and miners.

Around 360mya, a walk through where Lerwick is now, would have meant a wade across fast-flowing rivers, in a climate like that in Death Valley, California. How do we know? Well, if you take a stroll around Lerwick, and walk from the Knabb to the Sletts and out to the Sands of Sound, you can see for yourself. Here, flat-lying beds of thick, buff-coloured sandstone begin to acquire rounded pebbles and cobbles of pink and white quartz. These sandstone beds tell us that fast flowing rivers once deposited their loads in the area and that flash floods occasionally scoured the riverbed, leaving trains of far-travelled cobbles and pebbles embedded in the sandy layers. These rivers were fed by run-off from high mountains to the west, which carried sediments east to be deposited in lakes.

Looking at the Shetland landscape today, you might be confused by this talk of mountains. However, if you make your way either north or south from Lerwick, you cannot help but notice the ridges of hills that make up the ‘spine’ of Shetland. These hills are the eroded remnants of the ancient Caledonian Mountain chain that was thrown up some 400mya. This chain would have matched today’s Himalayas in height and grandeur.

Stegotrachelus finlayi Devonian lake, Exnaboe

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