|Roche moutonnée near Llyn Cau ,Cadair Idris, Wales.|
- A Roche moutonnée called as sheepback.
- It is a rock formation created by the passing of a glacier.
- The passage of glacier ice over underlying bedrock.
- Results in asymmetric erosional forms.
- Discovered by: Alpine explorer Horace-Bénédict de Saussure
- Year : 1786 ( The 18th-century )
- He saw in these rocks a resemblance to the wigs.
- That were fashionable & smooth.
- Edges have been smoothed.
- Eroded direction once passed over it.
- It is often marked with glacial striations.
- The rough and craggy down-ice side is formed by;
The erosional process
1. Ice melts slightly by pressure.
2. Cracks in the rock.
3. Then the water refreezes.
4. The rock becomes attached to the glacier.
5. Afterward he glacier continues its forward progress.
6. It subjects the stone to frost shattering ripping strips away from the rock formation.