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jim

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Reply with quote  #1 
Picked this up on the beach today. I'm still a noob, but having lived in East Sussex for a few months I've become pretty adept at identifying our local fossils (if it isn't a sea urchin, it's a sponge), but this new thing has me stumped!

Initially I thought it was some kind of coral, but on further inspection I think maybe the top part of an ammonite (or mollusc) shell. Perhaps the strut-like features are part of the internal structure?

Also worth noting that I have been told a good deal of the pebbles on the beach have been imported, and the local flint is typically a dark black-grey, so while I assume that most finds are cretaceous this could be from... anywhere.

Any help or thoughts would be much appreciated!

IMG_20190512_222615.jpg  IMG_20190512_223356.jpg  Right hand side (note triangular markings):
IMG_20190512_223003.jpg
left hand side
IMG_20190512_222804.jpg 
Finally, if anyone has any thoughts on prep, they would also be gratefully received!


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Gary W

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Reply with quote  #2 
Looks like an echinoid possibly phymosoma.

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Gary
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jim

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Reply with quote  #3 
Thanks Gary, I had also started wondering is it was, in fact, another sea urchin. But I'm still not sure I understand what the strut-like structures are. 

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prep01

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Reply with quote  #4 
Hello Jim, this looks like a flint so is not preppable.
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Colin Huller
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TqB

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Reply with quote  #5 
I just commented on another forum that the struts are moulds of ambulacral pores, the shell being dissolved away.
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jim

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Reply with quote  #6 
TqB, I think your theory is the most convincing I have heard so far. It blows my mind that the struts would be preserved at all!
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Gary W

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Reply with quote  #7 
If you are prepared to take a risk place a chisel beside the fossil and give it a good hit. Often the echinoid will pop out.
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Gary
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prep01

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Reply with quote  #8 
Hi Gary, very risky wth flint and full PPI id needed because of tiny splinters.
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Colin Huller
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