GeologyRocksVertical marks in sedimentary rocks
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Here's a link to the pic:
Wed, 11/28/2012 - 14:37
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It won't let me in wothout a
Thu, 11/29/2012 - 09:47It won't let me in wothout a Yahoo ID - or facebook twitter or some such. Sorry I'm not joining that!
Try another way to send the picture.
John
“Civilisation exists by geological consent, subject to change without notice.” - Will Durant
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They are strange. I feel
Thu, 11/29/2012 - 18:41They are strange. I feel that they must be man-made, although they stop abruptly at each bed boundary, even that 'wash out channel' in the centre.
There are similar marks in the Old Red Sandstone cliff at Appleby, but those marks extend over a wider area, and the cliff is adjacent to the church, which (surprise, surprise) is built from Old Red Sandstone.
Anyone else got any thoughts on this one?
John
“Civilisation exists by geological consent, subject to change without notice.” - Will Durant
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If you didn't see the info
Thu, 11/29/2012 - 19:28If you didn't see the info posted on Flickr where the pic is - it says:-
"Heading North along the River Dee into Chester on the left bank of the river about half a mile from the towncentre (just below a water pumping station)"
I've walked past this 2 or 3 times - if it was from the teeth of a JCB excavator or some other machine perhaps they worked in one direction (digging out a natural layer) then turned around and worked their way back in the opposite direction digging out down to the next natural fault between layers but the lines are quite regular in their spacing and there does appear to be a high level of continuity between layers (i.e. vertical lines that continue from one layer through to the next) - you get ripples in sand due to tidal action - could it be something like that - a horizontal surface turned through right-angles? Standing back - is it obvious why the entire face is roughly flat anyway? Has it been excavated? I gues it has but why are the lines missing in some layers (or less obvious) and why a change of direction at boundary layer?
Neil
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It doesn't say that on mine
Thu, 11/29/2012 - 20:17It doesn't say that on mine I'm afraid. But downstream from a pumping station? Surely they would have ensured that the water had a clear passage? That is a very flat face.
John
“Civilisation exists by geological consent, subject to change without notice.” - Will Durant
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Vertical marks in sedimentary rocks
Submitted by lemonstar on Wed, 11/28/2012 - 14:35.I've noticed this particular rock face many times and without looking too closely at all, I had thought that the vertical marks were the result of cutting blades used to remove the face but looking at the photograph I'm now thinking there might be another explanation. There are layers but there is some continuity and a change in direction to the vertical marks - any ideas?
...the rest of you... keep banging the rocks together.