SOTA 101. Geometry meets Geology meets Biology meets Physics

Beinn a’Mhonicag GM/CS-101

Heading for the Island of Mull and the Mull Rally, I decided to take in a quick SOTA en-route. I don’t think I’ve ever been up Glen Roy and I’ve certainly never viewed the parallel roads, so it was going to be worth it for that alone.

Geography

In a nutshell, during an ice age, upper Glen Roy was full of water, a lake held back by a dam of ice. Wave action and erosion formed a shore line along the hill sides. As the temperature rose, the ice dam shrunk and a new lower shore line was formed…. Etc. Etc. Eventually, temperatures rose so much that the ice dam collapsed and a huge flood left the valley we see today. The shore lines remain high on the hillsides.

As a youth looking at maps, I saw these parallel roads which weren’t joined to any others, but didn’t really understand. The Ordnance Survey depicted them as Land Rover tracks, which didn’t help.

So, back to the mission. We left home at 0945, had a second breakfast in Aviemore at 1100 and eventually appeared at Roy Bridge at 1300. “Road Closed Ahead after Bridge”, read the sign at the Glen Roy junction. We drove up anyway, ever hopeful.

An interesting drive on a single track road led us to the viewpoint car park, which also happened to be the start of the hike. The Road Closed sign was immediately after the car park. Mo took one look at the hill and said No!

the climb ahead

car park information board

Geometry

I changed shoes, selected some radio gear from the array in the back of the Landie and set off up the grassy break in the heather.

1km at a 35% gradient is what I worked it out to be. Not too steep that I needed to pause for breath and no heather bashing. Short grass and narrow path most of the way. A great calf stretcher.

looking down to Glen Roy

All of a sudden I saw a cairn ahead. No false summits here. The real top was 150m to the west, so off I went. I should mention at this point that it was quite a breezy day - something I’d forgotten in the shelter of the east side of the hill. Well, the summit was on the west side of the hill and the wind was blasting up the slope and over the summit. 50mph/80kph. I did think of retreating, but the summit cairn looked perfect for rigging my Carbon 6, so I decided to stick with it.

Beinn a’Mhonicag GM/CS-101

I ran my EFHW as a long sloper, with the apex at 3m above the cairn. Stones held the feedpoint and the end respectively. I felt quite pleased with it.

40m SSB was noisy but I added a few well known calls to my log. 20m wasn’t so good, with just the one after several calls. The cairn was providing a little shelter but not enough. The top section of mast telescoped. I quickly put on a spot for 2m, hoping that HF callers would see it and go chase someone else. Only then did I rake around in my bag for the ft-60 and rh-770 combo.

on 2m FM

As it happened, my only contact was with Gordon @GM4OAS over an improbable path. He wasn’t even monitoring SOTA spots at the time. Thanks Gordon!

Five minutes later I gave up. When I went to drop the pole, I found it incredibly difficult due to the wind bending the pole sections. There was a blast of wind up and over the hill and this happened.

major pole collapse

Physics

I’ve broken sections of pole before but it’s usually been the upper ones and always due to icing. I think the angle of my pole combined with wind load proved too much for it today.

I managed to pack it away ok and set off down the hill. Much better views on the way back.

parallel roads clearly visible

I’d crossed two parallel roads on the way up but hadn’t noticed. They were much more obvious when descending.

parallel roads, as shown on the OS map

In summary, a short bur steep hike, an even quicker activation, managing three bands in about 10 minutes. Broke my pole, saw some amazing stuff and manged the whole thing in an hour an a bit, and all on an accessible wee hill that hadn’t been activated for about ten years. Definitely worth a look if you’re passing by Roy Bridge.

Biology

Just before I dropped off the top I came across this. It looked like quartz but was actually a jelly like substance.

no banana for scale

No, it isn’t snow. Any guesses?

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Star Jelly

I hadn’t heard of it until I found similar patches a couple of years back on the slopes of Carneddau, GW/MW-023

Rick

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So they’re just past lake shorelines, not roads at all? Or were they later ‘improved’ for transit? If not why does the OS show them as roads?!

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Very mysterious, even according to Wikipedia.

Yes. You use the word “just”. I wonder if this is a more common sight in ZL? The car park information board said it was a site of international importance.

Some bits are used by farmers and foresters as tracks. Some bits remain unconnected to anything.

the 1:25000 OS map has them named as parallel roads

I think they were initially thought to be man made and I guess the name has stuck.

From Google:

Geological importance: The Parallel Roads are considered one of the world’s top geological locations and are part of the Glen Roy National Nature Reserve.

Understanding Ice Ages: They were instrumental in the development of Glacial Theory in the 19th century, leading to the understanding of ice ages and their impact on landscapes.

Historical debate: Early thinkers, including Charles Darwin, debated their origin, initially believing they might be marine shorelines before the role of glaciers was widely accepted following the work of geologist Louis Agassiz.

Also:

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The word ‘just’ wasn’t supposed to be denigratory! Just expressing surprise at the name and map indications. But I guess yes - before the understanding of the true vastness of geological time, and the past climatic upheavals, assuming they were ‘old roads’ would be an understandable instinct.

I have encountered what I’ve concluded must be sections of preserved past lake shorelines in ZL. But nothing as obvious or striking in the landscape as those.

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This is all too advanced for 101.

Sorry about the pole, must be like Trigger’s broom by now.

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That was the alternative heading for this post.

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Isn’t it sufficiently simplified?:grinning: I suppose a full coverage would be in a 301 level course.

I find it fascinating. Glen Roy is itself a glacial valley, it was probably full of ice at the peak of the most recent great ice age (Wurm stadial), but as the ice sheet melted it became clear of ice. However there was a final twitch of the ice age, which used to be known as the Loch Lomond re-advance (now the Loch Lomond stadial) in the period known as the Younger Dryas (about 12,000 years ago.) This led to the reappearance of glaciers advancing from the direction of the Ben Nevis range, cutting off the drainage of Glen Roy and forming the lake that caused the “roads”. There is a theory that the Younger Dryas cooling was caused by an asteroid impact in the Great Lakes area of the USA, and a final nugget of useless information, the Younger Dryas was named for the appearance of an alpine plant, Dryas Octopetala, in the lowlands, an indicator of low temperatures. It still grows on British highlands, usually on limestone, and is commonly known as “mountain avens”. Its quite pretty.

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…after I worked you I looked at the map and was why there were parallel forest tracks….( I also looked at the contours and thought it looked a steep climb) … but I now understand! Thanks Paul

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You won’t be thanking me when you are climbing it for a complete! TBH it’s not that bad. Don’t fancy it in wet weather though. The wet grass would be treacherous.

Conglomerate rocks and parallel roads… that’s 2 bits of geology I learnt from you.

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Next lesson. Hanging corrie and ox bow lake.

Ah, I know Ox bow lake. I learned all about them and how they are created when I helped my sister revise for her Geography O-level back in 1972-3. I think back then it was a mainly essay based paper. If it had been multiple choice I reckon I could have passed the exam even though I was only 11 but I wasn’t able able to construct wordy answers then. Hell I was still at junior school!

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…ox bow lakes are known as billabongs in vk.

Geoff vk3sq

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Visited Glen Roy a couple of decades ago-very interesting to see the ‘Roads’. 73 John

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Thanks for reminding me of that day, John. Almost a year ago and it’ll soon be time to go back to Mull. :smiley:

Reminds me of a kids book we have “What made Tiddalik laugh?” I believe it is based upon an Aboriginal tale. This frog was very thirsty and drank all the water, including from all the billabongs. Which the kids pull a face at when I say it. Also features the word “guffaw”.

Here’s the author’s website.

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Just re-read this entry.

It might be a hill to do on a flyby to or from Plockton next week.

Andy

MM7MOX

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