"Glen Roy in the Lochaber area of the Highlands of Scotland is a National Nature Reserve and is noted for the geological puzzle of the three roads ("Parallel Roads"). The "Parallel Roads" of Glen Roy are lake terraces that formed along the shorelines of an ancient ice-dammed lake. The lake existed during a brief period (some 900-1,100 years in duration) of climatic deterioration, during a much longer period of deglaciation, subsequent to the last main ice age (The Devensian)." according to Wikipedia
I came across this interesting area when writing the second book of my trilogy 'Dawn of the Lost Civilisation' as I was looking at the work of Darwin and this was one of his papers for he was a 'geologist' as well as a 'biologist'. Apparently, when he saw Glen Roy he concluded (incorrectly) that the 'parallel roads' were due to higher sea levels in the past. Guess you maybe brilliant but you can't win them all - within his lifetime the 'better' geologist had convinced the world that they were cause by 'ice lakes' due to isostatic uplift and are classified (again incorrectly) as 'raised beaches'.
What Darwin (and to date the existing 'institutionalised' geologists) did not understand is that these are classic features of 'Post Glacial Flooding' leaving shorelines on the hills and valleys of our countryside
And here is the reason why.
If we take a look at the myth that is Glen Roy and look at the current explanation and diagrams of what geologists currently believe we see just a few problems. The 260m map of the so called glacier shows that it was present in the South West and West - so far so good, but that's when the 'smoke and mirrors' come into play as it looks like the North and East are high range peaks encompassing the 'glacial lakes' - there not!
If you look at Darwins map you see the areas where the shorelines are visible.
On the first map (260m) it shows that the Water level was 260m when the ice arrived - which is quite interesting for me as the current height of the water at the base of 'Bohuntin Hill is currently 100m - are geologists now admitting that 'Post Glacial Flooding' existed around Glen Roy at the end of the Ice Age and that's why the river was 150% deeper than today?
Lets move on to drawing number two showing the river at 325m. They suggest that at 325m it over spills down to the loch and hence the water staying at 325m for a number of years creating a shoreline and the extra water keeping the loch at 260m.
The problem with this idea is that, IF the 'lake over-spilled at the indicated 325m outlet - where is the 'parallel road' at that point - it stops at the start of the valley that leads to the 'outlet', so the water never went that way.
I suggest you take a look at it in Google Earth, as it also shows that the 350m & 325m shorelines disappear long before you even get to that point.
On the last map it says that "350m outlet passes at the head of Glen Roy controls the lock level" - which make you believe that it must be at least 350m high at this point creating the so called ice lake - sadly, for the geologists and as shown on Darwin's map it is a river valley which is 25m lower than the 'lake'.
Moreover, You can use Google Earth to measure the height of the 'Parallel Roads' more accurately now that in the past - and they are not quite parallel, there is a variation of +/- 25m in places..
Not quite the flat lake you would expect if the hypothesis was correct!!
Furthermore, to form a 30 foot shoreline out of rock the 'lake' would need to be there for thousands of years. this this occurred at the start of an ice age, if a glacier has already arrive in the adjoining valley then within hundred or so years the lake would be frozen and the water gone. If it was at the end of the ice age - the glacier would be retreating not expanding.
The only logical sensible conclusion you can make is that it was caused by 'Post Glacial Flooding' as fast moving water would cut into the sides of the hills producing the 'shorelines' we see today. This is especially true when you realise that geologists needed to accept my hypothesis to get their first 260m shoreline before the ice arrived.
This is not the only 'Raised Beach' i've investigated and proved geologist incorrect. In my new book '13 Ancient things that don't make sense in History' I have an essay that looks at Brighton's 'raised beach' only to discover it was 70 miles from the sea when it was formed.