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richllama
5AB8643D-349F-4D48-85B2-A8EB317B4C64.jpeg  A6FEA870-6B43-4099-88F4-E8446912BD1F.jpeg  8909BCD3-56A7-468E-9B1C-EC0CB024847A.jpeg  Hi there, I found this rock when paddling with my kids in the river in Abergavenny. It appears to me to have around 15 - 20 fossilised fish on its surface. I’m a compete amateur with no palaeontology experience so I hope I’m not making a fool of myself here. I’ll upload some pics, if you could help me identify what it is that would be amazing! Thank-you, Rich
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Brittle Star
Hello and welcome, sorry not fish but coral. Someone can give you more information as I am not familiar with that area.
JW

 Never ask a star fish for directions
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Dirty Pete
Looks like Carboniferous limestone with fossil coral which would make it roughly 340 million years old. The Usk & its tributaries must have transported it there (it looks well rounded) from the Carboniferous limestone outcrops in the hills to the southwest (Blorenge/Gilwern/LLangattock.....etc) as Abergavenny is on Devonian rocks.

Somebody might suggest an ID for your coral, meanwhile here's a pic to give you an idea what all the lines are about.....

978-3-540-31078-5_3_Part_Fig55_HTML.jpg 

Pete
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richllama
Wow that’s fascinating, thank you both, it would be great to find out exactly what it is but that’s a brilliant start! Quite obvious when you point it out that it’s coral! Are these fairly common to find in this area do you know? 
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Dirty Pete
There's probably plenty of Carboniferous limestone pebbles/cobbles in the Usk which have made there way down from the hills but I reckon you're lucky to find one with coral in it. I've spent many an hour wandering about the limestone outcrops/quarries in those hills and found nothing......

Pete.
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prep01
Hi, yes they are very common, but I am no expert on Carboniferous corals, especially as this pebble is very worn - Tarquin might be able to give you a better ID. If you live on the south coast West of Cardiff, the rocks are full of Carboniferous corals.
Colin Huller
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TqB
I agree with the others. It's most likely pieces of a species of the colonial coral  Siphonodendron. Pictures of it wetted might help.
Tarquin
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richllama
Thanks for your help with this, really appreciated. 
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