How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.
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Transcript of How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.
![Page 1: How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649d765503460f94a578db/html5/thumbnails/1.jpg)
How to recognise …a Roche Moutonnée
Honnister Pass in the Lake District N.G. Ref
NY 212148
![Page 2: How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649d765503460f94a578db/html5/thumbnails/2.jpg)
Ask some questions…
Was the area once under ice?
Of what is the feature composed?
What shape is the feature?
What would the direction of ice flow have been?
![Page 3: How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649d765503460f94a578db/html5/thumbnails/3.jpg)
Now for some answers…
Here is the view down valley of the feature
CorrieArête
‘U’ Shaped profile
So – the area has been glaciated
![Page 4: How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649d765503460f94a578db/html5/thumbnails/4.jpg)
Some more answers…
Up valley
Down valley
So the ice went this way
Rock not sediment
Gently sloping smooth side
Steep and rugged side
![Page 5: How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649d765503460f94a578db/html5/thumbnails/5.jpg)
Have a closer look
here
Is there evidence of abrasion?
…and here
Is there evidence of plucking?
![Page 6: How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649d765503460f94a578db/html5/thumbnails/6.jpg)
The up-valley (up-ice) side
Smoothed rock with striations parallel to direction of ice flow
![Page 7: How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649d765503460f94a578db/html5/thumbnails/7.jpg)
Plucked face
The down-valley (down-ice) side
Steep face
Now look closer!
![Page 8: How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649d765503460f94a578db/html5/thumbnails/8.jpg)
The lee end
Much evidence of plucking
![Page 9: How to recognise …a Roche Moutonnée Honnister Pass in the Lake District N.G. Ref NY 212148.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649d765503460f94a578db/html5/thumbnails/9.jpg)
It all adds up to …
Ice smoothed (abraded) ‘stoss’ end
Plucked ‘lee’ end
Formed of bed rock
Asymmetrical profile
A Roche Moutonnée