Stoer Bay Rock (s)

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Stoer Bay


I am not in any shape nor form a geologist. I am however fascinated by the stones around Stoer and indeed the amazing rock face in the chalet grounds themselves. The colours in some of the rocks are amazing, especially along the Bay itself. Its very hard resisting the urge to come back from a walk without at least one pebble in your pocket.
This always makes me smile  as it reminds me of  a local ranger’s walk we went on as a family here when our boys were much younger.
Afterwards the talk of meteors and space rock, Ben, our youngest disappeared off and came back struggling to walk under the weight of pockets and arms bursting with “space rock” to take home for all his friends. I think if he had been allowed, Stoer Bay would have been stripped bare of every rock possible and piled into our car as souvenir’s. Luckily that didn’t happen and there are plenty there for everyone to admire.
Here is a little info on the rocks you can find at Stoer Bay …including Bens Space rocks (Reidite).
The area is still of fascination and college parties of students studying geology are often seen around the area and if you walk along to Stack Fada (where the rock dissappears into the sea leaving a “shark fin ” protrusion out of the water along the cliff walk at the bay, you may also see small round bore holes where rock samples have been taken.

Torridonian Sandstone

Sedimentary rock that starts out as little grains carried along in rivers and streams and is a built up of many many layers of sediment, eventually  compacting  under the weight of the layers above until it becomes rock. Erosion  exposed these rocks and in some places you can see ripple marks made by an ancient river. The stone ripples you  see in the rocks around Stoer Bay were formed  1000 million years ago. The rock is the Stoer Group of Torridonian Sandstone, a sedimentary type of rock.

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The rock face in the chalet grounds

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Rock formation at Stoer Bay

Lewisian Gneiss

The Oldest Rocks in Britain – and some of the Oldest in the World. As well as being very pretty, these rocks are 3 billion years old. They are also some of the oldest rocks in the World. Lewisian Gneiss is metamorphic, this means that volcanic heat and pressure has changed its structure .Originally the rocks were like granite which changed as the Earth’s crust became molten and they solidified, which is the reason you can see differences in the way the layers are seen, ranging from the white, to pale grey and even really dark grey. Because they were once part of the same continent, the same rock type is found in North America and Greenland. The rock has been eroded and scoured by glaciers to form hillocks  and small lochs. In many places the Lewisian Gneiss is overlaid with Torridonian Sandstone.

Reidite
The earliest known occurrence of one of Earth’s rarest minerals has been found here in Stoer Bay.The 1.2 billion-year-old reidite was found in rock samples taken from Stac Fada , Stoer Bay. Reidite is only known to form in nature during meteorite impact events. The discovery reinforces a theory that Stac Fada’s geology was formed by material thrown out by a meteorite impact 1.2 billion years ago.

 

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