Author Topic: Another Thing To Identify Please  (Read 1191 times)

Offline The Old Ruminator

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Another Thing To Identify Please
« on: August 11, 2020, 08:24:30 pm »
No its not a potato. Buried in sediment inside a cave. Andy F. will know.

P8110003 by Nicholas Chipchase, on Flickr

Offline Alex

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Re: Another Thing To Identify Please
« Reply #1 on: August 11, 2020, 08:28:05 pm »
A poodle?
Anything I say is represents my own opinion and not that of a any club/organisation that I am a member of (unless its good of course)

Offline traff

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Re: Another Thing To Identify Please
« Reply #2 on: August 11, 2020, 10:36:39 pm »
Ginger root?

Sorry not helping.....

Offline Roger W

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Re: Another Thing To Identify Please
« Reply #3 on: August 11, 2020, 11:12:42 pm »
Ironstone nodule???
"That, of course, is the dangerous part about caves:  you don't know how far they go back, sometimes... or what is waiting for you inside."   JRR Tolkein: "The Hobbit"

Offline mikem

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Re: Another Thing To Identify Please
« Reply #4 on: August 12, 2020, 07:47:52 am »
Toy from mother shiptons

Offline Brains

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Re: Another Thing To Identify Please
« Reply #5 on: August 12, 2020, 07:58:13 am »
Chert nodule

Offline Pete K

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Re: Another Thing To Identify Please
« Reply #6 on: August 12, 2020, 08:33:52 am »
I'd say chert too. Chip a bit off if you can bear to and see if it looks like a poor man's flint inside. Giving it a really good clean and maybe a sand down might reveal what's inside less destructively.

Offline Andy Farrant

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Re: Another Thing To Identify Please
« Reply #7 on: August 12, 2020, 08:48:35 am »
It is most probably  a chert nodule. If it is from East Mendip, you do get chert nodules in the limestone (particularly common in the upper part of the Black Rock Limestone), but as ever it is hard to tell from a photo, especially when caked in mud. The other possibility is an oncolite (an algal concretion akin to stromatolites) which do occur in the Clifton Down Limestone, but the morphology doesn't look right. Best to clean it and if it is very hard and siliceous, then it is chert.

Offline The Old Ruminator

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Re: Another Thing To Identify Please
« Reply #8 on: August 12, 2020, 08:53:00 am »
Thanks all. It came from Bleadon Cavern, West Mendip.

Offline The Old Ruminator

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Re: Another Thing To Identify Please
« Reply #9 on: August 12, 2020, 10:27:22 am »
A bit more from the finder.

It came from a filled mine shaft on Bleadon Hill in ocherous  earth. It has been cleaned, a smaller similar one is CaCO3  - massive fizzing with HCl - and grey inside, not chert. I have a similar piece that has formed as a crust rather than a nodule. Don't want to break the poodle, but will hopefully find more tomorrow.

Offline Pitlamp

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Re: Another Thing To Identify Please
« Reply #10 on: November 22, 2020, 11:41:27 am »
My attention's just been drawn to this by a friend; can I ask, is your specimen at all granular inside?

By this I mean could it be a calcite cemented sandstone?
(Or even calcite with some SiO2 [sand or silt] grains within it?)
Both would react well with HCl.

I ask because we found something similar in a cave in the Dales this summer. Just wondering if we could learn anything useful from you, if you've investigated further since the last post around three months ago. Thanks.

Offline Pitlamp

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Re: Another Thing To Identify Please
« Reply #11 on: November 22, 2020, 11:48:46 am »
In fact - any chance you could post one of your excellent photos of the cleaned up "poodle"?

Offline Pitlamp

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Re: Another Thing To Identify Please
« Reply #12 on: November 23, 2020, 06:34:33 pm »
Here's the one I was on about in my post above. It came out of a sump which now carries only percolation flow and the hemispherical blobs are composed of calcite cemented sandstone on the surface of the limestone block (i.e. they're not inclusions within the limestone itself). There are several other examples still in the sump in question.

Samples of these blobs have been sent to people who know a lot more about this sort of thing than I do but no consensus as to their origin has yet been arrived at. I'm told that no such thing is included in Art Palmer's book on cave minerals of the world (with thanks to the person who looked on my behalf).

Just wondering if any forum users might have useful suggestions - and whether there's any connection between these blobs and the item brought to our attention by The Old Ruminator above?


Offline mrodoc

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Re: Another Thing To Identify Please
« Reply #13 on: November 24, 2020, 09:23:01 am »
I would have said this is a concretion as you surmise. Reminds me of the Moeraki boulders in New Zealand's South Island on a miniature scale. There are papers on the origins of the Moeraki boulders that might help hint at the origin of your concretion.

Offline Pitlamp

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Re: Another Thing To Identify Please
« Reply #14 on: November 24, 2020, 09:47:42 am »
Thanks mrodoc.

Meanwhile, here's another example with the limestone broken, revealing that the blob is on the surface rather than within the limestone.

Offline Pitlamp

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Re: Another Thing To Identify Please
« Reply #15 on: November 24, 2020, 09:51:29 am »
Following up mrodoc's suggestion:

https://www.distantjourneys.co.uk/blog/moeraki-boulders-natural-phenomenon-mysterious-legend/

Interesting - there may well be clues here.

Offline mrodoc

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Re: Another Thing To Identify Please
« Reply #16 on: November 24, 2020, 05:58:25 pm »
Might as well stick a pic  in of a Moeraki boulder just for the hell of it.

Offline grahams

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Re: Another Thing To Identify Please
« Reply #17 on: November 24, 2020, 06:29:16 pm »
It appears to be a Slipperman.

Sceptics wanted!

Offline mikem

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Re: Another Thing To Identify Please
« Reply #18 on: November 24, 2020, 07:04:56 pm »

 

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