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rab7ies

thanks bobcat.
down amongst the stones.
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rab7ies

decided to try cracking out 3 of my lil regular echinoids(had a very good look first throo my eyeglass and then it was hammer time)....no 1...104_3663.JPG 104_3664.JPG .......no 2..............104_3679.JPG 104_3680.JPG ............no 3...............104_3681.JPG 104_3683.JPG 
down amongst the stones.
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Doggerfan
Cracking good job!
Best wishes from the Lake of Constance. Roger.
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rab7ies

thanks Roger(the third one lost 2 lil slithers but I have them...all in all they are all lil crackers!)
down amongst the stones.
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Doggerfan
Have you been able to ID them?
Best wishes from the Lake of Constance. Roger.
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rab7ies

no,any help would be greatly appreciated(im guessing gaulthieria)
down amongst the stones.
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Doggerfan
I'm no great expert on the subject, but that could be right by the looks of them. Are you familiar with this?

http://www.nhm.ac.uk/research-curation/research/projects/echinoid-directory/index.html



Best wishes from the Lake of Constance. Roger.
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scatessa
Love them xxxxxxxx
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rab7ies

thanks Roger and yep I use that quite a lot(still find it difficult to id them)....thanks Scatessa and so far my fingers have escaped injury! xxxxxxx
down amongst the stones.
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rab7ies

have been busy cracking flints open recently(used to bring a lot of bits home that showed slight bumps n lumps..so thought I would find out whats in em)...finding quite a few urchins,not all complete  but interesting and its all gain!.......one thing have noticed is a lot of the fossils deep inside the flints have green stuff on them(only on the fossils not throughout the flints)anyone know what this maybe?.....split a piece and found this urchin(not sure of type)......
104_3741.JPG ...took one more whack at this piece and glad I did...nice sternotaxis underneath it 104_3744.JPG ....the print and first urchin above it 104_3745.JPG ..........titchy lil micraster(3rd pic shows the green stuff I keep finding on the fossils) 104_3747.JPG 104_3748.JPG 104_3749.JPG 
down amongst the stones.
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Hydrangea


Hi rab7ies - if the green stuff is not organic, then it may be the mineral glauconite. Copper minerals do occur very very rarely in chalk and flint, so malachite is a possibility but unlikely.

I love your flint echinoids, they are uncommon on the Yorkshire coast unfortunately.


regards

Roy D.
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rab7ies

thanks Roy.
down amongst the stones.
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Richard
I agree with Roy that the green colour is probably glauconite. This mineral is common in sedimentary rocks. In my area (Berkshire) flints from the base of the Reading Beds are glauconitized. Further east, you find green-coated flints in the Bullhead Bed of the Thanet Sands.
Richard
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rab7ies

thanks Richard,have also found my first urchin spine(only ever found lots of prints before)inside a piece of flint...small and very fragile(there were 2,but one crumbled to nothing)
down amongst the stones.
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Richard

Yes, they do seem quite uncommon - here are a few that I have found - have you got a photo of the one you found? 


f.JPG k.JPG 
y.JPG 





Richard
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rab7ies

those are excellent Richard..will try to take a pic but its very fragile.

down amongst the stones.
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scatessa
Nice
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>bobcat<


Although it is difficult to identify Gauthieria species and small Phymosoma species from flint casts, the balance of probability would be with Gauthieria radiata.

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