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#386316 - 5th Feb 2010 11:10pm Thurstaston Cliffs
MrG65 Offline
Member

Registered: 2nd Feb 2010
Posts: 56
Loc: Here
I thought I'd put a couple of pictures up of the cliffs after seeing the "Thurstaston face" image in the Photo Gallery.

These cliffs are eroding boulder clay, and are designated a Site of Special Scientific Interest and cannot be protected from erosion - it is the erosion that is important to their status.


There's a couple of pics of slips attached somewhere to this message



Sometimes this can cause unstable-looking outcrops to appear - here's one from a couple of years back


See the big crack from the top coming vertically down towards a smaller crack at lower left.... just to the left of this there was a lens of sand in the boulder clay which had been eroded/dug out by kids. That just made the potential for a collapse here worse. Also, within the dug-out hole, several horizontal holes had been driven in by an escape committee of rabbits, further undermining the overhang. Anyway, safest solution was to pull the lot down in a controlled fashion, as shown.

Final picture shows how everything looked 6 months later.

(There may or may not be 5 photos attached to this post, in some sort of random order, depending how badly I've messed it up)


Attachments: Viewing Permissions May Apply. Click Me
DSC00323.JPG

DSC00317.JPG

Description: Thurstaston Cliff Slip

DSC00279.JPG

DSC00600.JPG

DSC00336.JPG



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#386331 - 6th Feb 2010 8:23am Re: Thurstaston Cliffs [Re: MrG65]
Softy_Southerner Offline

Forum Guardian

Registered: 2nd May 2008
Posts: 4092
Loc: Back in Devon
Part of me thinks it good to let nature take it's course and let the erosion continue but then I think how far can it go before it impacts elsewhere????
I'm surprised that you don't seem to get loads of fossil hunters there - I would think there were loads if you're into that sort of thing.

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#386332 - 6th Feb 2010 8:46am Re: Thurstaston Cliffs [Re: Softy_Southerner]
MissGuided Offline

Awesome
Wiki Guardian

Registered: 18th Jul 2008
Posts: 9995
Loc: Back of the wardrobe
I've looked for fossils there Softy. Didn't find much, if anything. The clay contains a good variety of rocks though. If I were a keen geologist I'd get excited about where the rocks had originally come from. I was told by my geology teacher that a lot of them came from the Lake District.
_________________________


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#386347 - 6th Feb 2010 10:26am Re: Thurstaston Cliffs [Re: MissGuided]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Originally Posted By: Snooze
If I were a keen geologist I'd get excited about where the rocks had originally come from.


Thank god youre not omg

raftl
_________________________


What If There Were No Hypothetical Questions?

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#386363 - 6th Feb 2010 11:05am Re: Thurstaston Cliffs [Re: StuyMac]
BandyCoot Offline

Forum Veteran

Registered: 7th Dec 2008
Posts: 5360
Loc: Birkenhead
Good interesting pics. The East Coast thinks they're the only ones that are eroding, mind you the worried ones are those that bought houses set back from the coast and now they are part of the beach, unlucky.
_________________________
Birkenhead........ God's own Room 101.

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#386371 - 6th Feb 2010 11:33am Re: Thurstaston Cliffs [Re: BandyCoot]
derekdwc Online   content


Forum Veteran

Registered: 13th Oct 2008
Posts: 5015
Loc: Birkenhead
would the machine have to have gotten on to the beach at West Kirby and gone along the shoreline to that spot
I take it thats where the steps are at the bottom of Station Road

Anyone any idea where it got on to the shore and how far the tide
goes up to (if it does) the cliffs

many moons have passed since I was last there


Edited by derekdwc (6th Feb 2010 11:36am)

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#386407 - 6th Feb 2010 2:13pm Re: Thurstaston Cliffs [Re: derekdwc]
KevinFinity Offline

Forum Master

Registered: 30th Apr 2009
Posts: 2324
Loc: Wirral
The machine could have got on to the beach at West Kirby marine lake, at the end of Macdonna drive or the other end of Cubbins green. Also it could have gone down the slope at Caldy sailing club which is nearest and most likely. The tide obviously does reach the cliffs but not very often. It is not eroding any where near as fast as places in the east coast I visited last year.

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#386433 - 6th Feb 2010 5:56pm Re: Thurstaston Cliffs [Re: KevinFinity]
MrG65 Offline
Member

Registered: 2nd Feb 2010
Posts: 56
Loc: Here
Hi

The machine came down Thurstaston Slipway (Dee Sailing Club). The steps are south of Station Road (sometimes known as Tinker's Dell). The tide can come up the side of the cliffs a good metre or two depending if its a high spring tide or not. If it's windy you can have waves on top of that.

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#386467 - 6th Feb 2010 7:27pm Re: Thurstaston Cliffs [Re: MrG65]
Softy_Southerner Offline

Forum Guardian

Registered: 2nd May 2008
Posts: 4092
Loc: Back in Devon
When we were down there last weekend, when I took the 'face' photo, we could only just get past the bottom of the cliffs and the tide had turned.

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#386896 - 9th Feb 2010 5:37am Re: Thurstaston Cliffs [Re: BandyCoot]
24424m Offline
Enthusiast

Registered: 31st May 2009
Posts: 118
Loc: Wirral
Originally Posted By: BandyCoot
Good interesting pics. The East Coast thinks they're the only ones that are eroding, mind you the worried ones are those that bought houses set back from the coast and now they are part of the beach, unlucky.


Those houses down by Caldy steps look particularly vulnerable. Okay, they have big gardens, but you can tell by some of the out-buildings and summer houses now teetering on the brink that the cliff is still receding, despite boulders being placed at its foot.

Is erosion all due to the action of the sea I wonder, or can land drainage also eat away at the soft boulder-clay cliffs?

The problem with defending against erosion is that it is a natural process, and what is lost from one area is usually deposited down the coast, forming a defence there - so interfere with this, and the likely outcome is short-term success in a very specific spot, but much increased damage elsewhere.

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