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janko
Joined: 30 Nov 2023
Posts: 3
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 Posted: Nov 30, 2023 03:53 Post subject: What is this sand stone rock? |
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The texture is quite grainy, seems to be made of amalgamated sand grains. Found near red sandstone/mudstone cliffs. Could this be an ancient sand rose?
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Locality: Nearby red Permian/Triassic cliffs
5cm |
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James Catmur
Site Admin
Joined: 14 Sep 2006
Posts: 1396
Location: Cambridge
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| Posted: Nov 30, 2023 04:50 Post subject: Re: What is this sand stone rock? |
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| Looks like a sandstone pebble, but the photo is not great.
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janko
Joined: 30 Nov 2023
Posts: 3
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| Posted: Nov 30, 2023 12:47 Post subject: Re: What is this sand stone rock? |
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Here is a closeup, I hope, of better quality.
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Locality: Devon
close up of the above |
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Kevin Schofield
Joined: 05 Jan 2018
Posts: 163
Location: Beacon NY
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| Posted: Nov 30, 2023 14:57 Post subject: Re: What is this sand stone rock? |
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| janko wrote: | | Here is a closeup, I hope, of better quality. |
Not really.
It may help to know where it was found, but I think I can say with certainty that it isn't a sand rose of any sort, ancient or otherwise. That would require it to be a sandstone cemented by selenite, and it would have a well-defined form. This looks like an eroded pebble.
_________________
Veni, Vidi, Emi |
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janko
Joined: 30 Nov 2023
Posts: 3
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| Posted: Dec 01, 2023 01:51 Post subject: Re: What is this sand stone rock? |
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Oh fair enough, maybe it's just that. I was wondering what's causing the texture with these coarse elongated holes. Is it due to erosion or the way the pebble formed?
It's from the south Devon coast.
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James Catmur
Site Admin
Joined: 14 Sep 2006
Posts: 1396
Location: Cambridge
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| Posted: Dec 01, 2023 05:43 Post subject: Re: What is this sand stone rock? |
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As it has been rolled in the sea that softer parts will have been eroded more quickly leaving deeper cavities
Have a look at this page:
http://www.devonrigs.org.uk/02Introduction.html
(link normalized by FMF)
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