How to recognise …a Roche Moutonnée

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Presentation transcript:

How to recognise …a Roche Moutonnée N.G. Ref NY 212148 Honnister Pass in the Lake District

Ask some questions… Was the area once under ice? What would the direction of ice flow have been? What shape is the feature? Of what is the feature composed?

Now for some answers… Here is the view down valley of the feature Arête Corrie ‘U’ Shaped profile So – the area has been glaciated

Gently sloping smooth side Some more answers… Up valley Down valley So the ice went this way Steep and rugged side Gently sloping smooth side Rock not sediment

Is there evidence of abrasion? Is there evidence of plucking? Have a closer look here …and here Is there evidence of abrasion? Is there evidence of plucking?

The up-valley (up-ice) side Smoothed rock with striations parallel to direction of ice flow

The down-valley (down-ice) side Steep face Plucked face Now look closer!

The lee end Much evidence of plucking

Ice smoothed (abraded) ‘stoss’ end It all adds up to … Asymmetrical profile A Roche Moutonnée Plucked ‘lee’ end Ice smoothed (abraded) ‘stoss’ end Formed of bed rock