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Rock E




Thank you for that information Richard which proved to be
most interesting. I made an internet search for
mammilated
chalcedony and now recognise that I have seen this type of formation; I have to
admit not in the field, but usually in fossil shops or a museum, and I thought
I had found a Cambrian cappuccino! Thank you for posting, this information has
increased my, limited knowledge of the subject, Rock E.



John Patrick

Well Iƒ¢¢â€š¬¢â€ž¢ll be a monkeys uncle, or should that be nephew.   
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Rock E




 



If these are
bubbles then might I be so bold as to suggest they are an example of a trace fossil,
a geological record of biological activity, what do you think? If they are not bubbles
what could they be?



The specimen
was found in my front garden whilst weeding gravel this time; I donƒ¢¢â€š¬¢â€ž¢t get out muchCry!
I asked for Chard flint at the builderƒ¢¢â€š¬¢â€ž¢s merchant for use as a decorative
ground covering a while back, I believe this material is quarried at Chard in
Somerset which is a few miles from where I live. Whether or not it is chard
flint I canƒ¢¢â€š¬¢â€ž¢t be certain but for economic reasons one would expect it to come
from somewhere in the west country, any way the said pebble almost certainly came
from the same source.



I would be
most grateful for your opinion and thoughts on this fined, thank you Rock E   



Bubbles__1.JPG Bubbles__2.JPG Bubbles__3.JPG Bubbles__4.JPG Bubbles__5.jpg 
John Patrick

Well Iƒ¢¢â€š¬¢â€ž¢ll be a monkeys uncle, or should that be nephew.   
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Richard
Hi 

This is mammilated chalcedony. It is a form of silica and is an example of a secondary mineral that has been deposited inside flint. 
Richard
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