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Dry Valleys in the Chantries EarthCache

Hidden : 3/4/2016
Difficulty:
4 out of 5
Terrain:
2.5 out of 5

Size: Size:   other (other)

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Geocache Description:

The Chantries form part of the ridge of the North Downs, just to the South of Guildford. Chantry Wood is 78 hectares of mixed woodland and an Area of High Ecological Value within an Area of Outstanding Natural Beauty in striking distance of Guildford Town Centre. The Chantries are popular with walkers (and dogs) all year.


Rabbits, deer, badgers and foxes live wild there and lots and lots of gray squirrels. In April/May the wooded area is a mass of bluebells. The top of the hill has open fields with stunning views to the south

The Chantries sit on the Folkestone Beds which is part of the Lower Greensand group. The Folkestone Beds consist of loosely consolidated sand grains.

This earthcache focuses on the valleys formed in the sandstone beds. The sandstone beds are porous meaning that most streams absorb into the ground quickly so there is normally only flowing water when it has recently rained.

These valleys are called dry valleys because they don’t have any water flowing through them permanently. Dry valleys develop on all kinds of permeable rock or on terrains that don’t regally sustain surface water flow. The valleys in the Chantries were probably formed in a periglacial period where the normally permeable bedrock would have been impervious (due to being full of frozen water) allowing flowing water to erode it. Also there would have been more water from the melting glaciers causing more erosion.

Questions

  1. How many valleys that are more than 5 meters deep for a 10 meter section on the north side of the Chantries, follow the path from the cache location to Halfpenny Lane, along the path that follows the north side of the top of the hill, going east. (the contours on maps are not accurate enough so there is no point in cheating)
  2. For each of the valleys, number them from the cache location to Half Penny Lane, state whether a) They have any permanent surface water flowing trough them (even a tiny flow of water that is permeant counts). b) There is any sign of recant natural erosion, like small dry stream beds. c) if human activity has made the valleys deeper. d) If they look like they were formed by meltwater or another way.

Additional Hints (Decrypt)

1. qba'g vapyhqr gur qrcerffvba nobhg 50 zrgref njnl sebz unyscraal ynar 2. sbe rknzcyr gurer vf n inyyrl ng gur pnpur ybpngvba, vg unf abg tbg n crezrnag fgernz ubjrire vg qbrf unir n cngu ehaavat guebhtu vg juvpu pnhfrf rebfvba ol gur crbcyr jub hfr vg (guvf znvayl unccraf ng gur gbc raq bs gur inyyrl). Nyfb gurer vf ab thyyl pnhfrq ol fhesnpr jngre orpnhfr gurer vf tenff gurer.

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)