Slides demonstrating features and processes of Periglaciation.

1. PERIGLACIATION M J Rollins (Muppetmaster)

2. Distribution of Permafrost

3. Periglaciation:- Permafrost “near to or on the fringe of an ice mass” Active Layer Continuous Permafrost Talik

4. Periglaciation:- Distribution of Permafrost Lower Angle of incidence = less sunlight UK Lat

5. Periglacial Processes and Features

6. Processes and Features Ice crystals and lenses Sorted Stone Polygons(stone circles) About 1 metre across Frost heave pushes stones to the surface which roll down the sides.

7. Processes and Features Stones Ground Surface due to heave The soil and stones move upwards due to ice crystal and frost heave Ground Level in Winter Ground Level in Summer Frost Heave The soil move downwards due to melting but ice crystal beneath stones stop them returning to original position. Ground Level in Summer Stones roll down to the bottom of the slope forming a circle.

8. Processes and Features Stone Stripes Stone Circles form on a gentle slope and slowly move down the slope, stretching the circles into lines. Image pulling an elastic band!!!!

9. Processes and Features Stone Stripes Stone Circles form on a gentle slope and slowly move down the slope, stretching the circles into lines. Image pulling an elastic band!!!!

10. Processes and Features Ground Contraction Ice Wedges and patterned ground

11. Processes and Features Freezing of Ground Water Pingos 50 m high 500 m diameter

12. Pingo not Pingue

13. Processes and Features Pingos Frozen lake insulates ground Unfrozen Talik Permafrost Permafrost ICE CORE Ice core Advancing Permafrost Advancing Permafrost Ice core expands upwards due to increased hydrostatic pressure

14. Processes and Features Pingos

15. Processes and Features Collapsed Pingo As the rupture Pingos ice core is subjected to heat it collapses, creating Collapsed Pingo

16. Processes and Features Water enters cracks and joints, freezes, expands (9%) repeatedly causing rock to frost shatter. Weathering Physical Weathering Frost shattering creates a Sea of Rock called a FELSEN MEER

17. Processes and Features Mass Movement Solifluction Lobes Soil Creep Soil thaws, becomes waterlogged and lobes of soil move down slope slowly.