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crusty_rusty59

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Reply with quote  #1 

It's only a wee one, but had to be picked up.
Both pictures blow up to a good size.

Found just south of Exeter.

Underside appears to be like sandstone, only harder. Not flint, or chalk.

I was thinking Coral, but I'm usually wrong. top.jpg  flip.jpg 


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TqB

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Reply with quote  #2 
It's a colonial coral. [smile] Hard to ID from the outside but it might be a Cretaceous Gault/Upper Greensand one in a silicified sandstone. Was it from around Haldon Hills? There's a famous bed called the Haldon Coral Bed (which I've never seen, just read about).
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crusty_rusty59

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Reply with quote  #3 

Thank you for your reply.

Yes, it was found down the valley from Haldon Hills.

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CurtKnap

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Reply with quote  #4 
Nice little specimen. Looks like there might be enough surface detail to ID to genus level if you know your Cretaceous corals (which I don't), or can locate suitable reference material.
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TqB

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Reply with quote  #5 
Modern references on these are hard to come by but here's a plate from the classic Monograph of British Fossil Corals, 2nd series, Duncan (1870).

Nos. 7 & 8, bottom centre and left, are Isastraea haldonensis Duncan (from Haldon, of course) which looks a good bet. (The genus has probably been renamed now.)

Screenshot 2018-12-07 at 09.38.30.png


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CurtKnap

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Reply with quote  #6 
Nice one, Tarquin; it does indeed look about right.
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