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Life's a Beach #77 - Pound's Pool Beach EarthCache

Hidden : 04/02/2018
Difficulty:
1 out of 5
Terrain:
3 out of 5

Size: Size:   other (other)

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Geocache Description:


PLEASE NOTE: THIS CACHE IS TIDAL. A FAIRLY LOW, LOW TIDE IS REQUIRED TO GET TO GZ.

It's also an Earthcache. Please don't go Tupperware hunting, you won't find any.

 

So, all in all this is a tidal Life's a Beach earthcache exploring the arches at Pound's Pool Beach. 

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If you would like to add more caches to this series, please feel free to do so!
Please contact heartradio through his profile first so that he can keep track of numbers and avoid duplications. Caches can be any type except Traditionals and letterboxes without multiple stages, so cachers can learn more about the beach.

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Before you venture forth with great gusto, please listen very carefully.

The walk to this cache has the potential to be dangerous, mainly if you are not aware of the tide. Please ensure that you are aware of the tide times for the day, and do not attempt this cache if you cannot clearly see the route along the beach. The route is mainly along pebbles so it should not be too slippy, however please be aware the large rocks may be.

I, nor Groundspeak nor anybody else, except you, is responsible if anything happens to you.

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Access

Parking available in Beer. Sorry folks, just because you are parking in Beer it doesn't mean your car will be flooded with the stuff when you get back. There are three car parks; the larger the car park you use, the further from the sea it is and the greater the probability of there being spaces. I rarely have to go to the large one. 

From there, head down to the sea. Don't be a silly seahorse and go along the coast path. Unless you have a parachute you will have a long walk back round when you realise your mistake, and possibly some angry family members to contend with too if you've dragged them out for a walk

When you get to the beach, head for GZ. If there's water at the base of the cliff, you ain't going anywhere. I'd advise you set off about half an hour before low tide at least. It needs to be a tide of less than 0.7 metres ideally - you can see the tide times here. 

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To log the cache:

Visit and study at the arches at the following coordinates (they are also marked as waypoints):

A - N50 41.447 W003 05.571

B - N50 41.420 W003 05.615

Please email the answers to the following logging tasks to me through my profile or through the Message Center. You do not need to wait for permission to log, however if I haven't received any answers within a couple of days of you logging a find, then your log could be deleted. 

1. From the headline coordinates, what evidence can you see that the cliff has retreated? This is particularly evident as you look back along the base of the cliffs to Beer. Use the geological information below to help.

2. Now walk to the waypoints 'Arch A' and 'Arch B'. Describe the approximate dimensions of each arch.

3. Describe the texture of the rock inside the arches. If there is a difference, why is this the case?

4. Based on your observations, which of the two arches do you think was formed first and why do you think this?

5. On your way back to Beer (or you could do this question first), look at the coastal landform at the waypoint 'Coastal Landform'. What is it, and, given time, what will happen to it next? Use the diagram and explanation below to help

 

Photos of your visit are welcome but not compulsory. Please do not include any information that could spoil the answers to the questions. 

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Geology:

Areas on a stretch of coast that have small cracks and joints on them are particularly susceptible to attack from waves. This can be because of hydraulic action, where air becomes trapped in joints on a cliff and weakens the rock as the air is compressed. It could also be due to abrasion (the grinding down of rock by fragments of rock and sand), or solution (acids dissolving softer rocks like chalk, as can be found here). The area below the crack or joint will be undercut and a small cave will form. If the cave forms on a headland, then on the opposite side of the headland, a second cave can also begin to develop simultaneously. The water erodes the caves through the processes described above, and as the two caves are eroded and cut into the headland, they will eventually meet. The resulting landform is then referred to as an arch.

The roof of the arch has no support, however, and is highly susceptible to weathering (the gradual breaking down of rocks) too. As the weathering continues, the roof of the arch will collapse leaving a stack. This too is eroded by the wave action against it, and will collapse leaving behind a stump. As the headland retreats under this erosion, the gently sloping land at the foot of the retreating cliff is called a wave-cut platform. This is visible at low tide. 

The cliffs at Beer are made of chalk, which is a soft white sedimantary rock (meaning it has been formed by sediment that has settled and compressed). It can be eroded by acids in the sea water - this is called solution. The several arches you see here are all quite different, in size and shape. These cliffs are the most westerly chalk cliffs in the UK. There are five or so arches, varying in size depending on when they were formed and how much erosion they've been subjected to. The largest of these arches is called The Hall. 

 

 

Additional Hints (Decrypt)

[No physical cache, read the description. ONLY ATTEMPT AT LOW TIDE]

Decryption Key

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

(letter above equals below, and vice versa)