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View of Sango Bay, Scotland. |
With many thanks to my granddaughter Paige, a student at Amherst College, for sharing her photos of her trip to Scotland in June and her breadth of knowledge of Scotland's geology.
During my second semester of this past school
year, I took a geology field trip class where we learned all about the geologic
history of Scotland. This class culminated in a week-long trip to the NorthwestHighlands of Scotland, during which we traveled around to different sites of
geologic interest and had the opportunity to see the rocks we had been learning
about all semester. Here are some pictures from the trip!
This bridge gave us a great view of some old lake terraces in Achnascheen! Each step you see on the sloping edge of the hill in the center represents the bottom of an ancient glacial lake, with the upper steps being the earlier lake bottoms which were then cut down through by increased meltwater supply to create the next step.
A horse near our hostel in Torridon with Loch Torridon in the background. Loch Torridon is a sea loch, meaning it’s connected to the ocean, so where the water met the land varied a lot over the course of our stay–I believe this picture was taken at high tide.
View of Slioch mountain halfway up Beinn Eighe.
Another view from the Beinn Eighe hike where you can see the paleogeography of an old landscape preserved in the mountain. The slight upward curve about halfway up this mountain represents the upper boundary of the Lewisian Gneiss, which would have been the land surface until it was filled in by the Torridonian Sandstone (above the line) starting around 950 million years ago!
The holes in this rock give the rock its colloquial name “pipe rock”. They are remnants of old worm burrows in sand that has since been lithified into quartzite. These worms would have been alive and forming these burrows in the early Cambrian, around 520-510 million years ago.
Both sides of the Moine Thrust, with the Moine Schist on top of the Durness Limestone. The Moine Schist is older than the Durness limestone, but it’s been thrust up to lay on top of the limestone by tectonic movement. This kind of stratigraphic inversion is only possible via tectonic movement, and Scotland is where thrust faulting was originally discovered!
View from our hostel at sunset.
A chunk of Lewisian gneiss at Achmelvich Beach. There isn’t much to say about this picture but the clarity of the banding is pretty awesome.
Some sheep we saw from the van. I’d say we saw about half as many sheep as people.
Clachtoll Beach! It looks tropical but I promise it was just as cold as you’d expect the North Atlantic to be.
These stromatolites are some of the oldest life on Earth that is preserved in the rock record, dating to around 1.2 billion years old. Stromatolites are a kind of algal mat that accumulate in the wet season and dry out in the dry season, trapping sediment and forming these wiggly lines.
This large black stripe is a Scourie Dyke, it’s about 2 feet across and is intruding into the body of rock around it. Around 2.4 billion years ago, the body of rock around the dyke was split by tectonic activity, allowing hot magma to push up into it and solidify into this stripe.
My friend in the distance at the Arnaboll Thrust.
My friend and I touching both sides of the Arnaboll Thrust! Here the Lewisian Gneiss has been thrust upon the Cambrian Quartzite, which we can be at peace with now but is something that caused a lot of problems among geologists of the 19th century. This thrust fault caused SirCharles Lapworth (eminent geologist of the time) to have an intense mental breakdown due to visions of the entire Scottish Highlands crushing his body, as thrust faulting hadn’t been discovered up until this point and it was just all too much for him to handle. Luckily I was well prepared and was able to enjoy the rocks without descending into madness.
On our last day we “saw” some puffins (these pictures were taken by my friend with a good camera–I only saw more than a black speck once he shared his photos with us) from the cliffs of Faraid Head, which I think was a pretty solid wrap up to the week!
I hope you’ve enjoyed these rocks and maybe
feel inspired to take a trip to the Northwest Highlands! I can’t promise it’ll
be as sunny as it was in these photos but it’s worth it nonetheless.