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I've found a few sponges around here but none quite like this - and there don't appear to be any sponges at all recorded from the area.

Despite having a fair bit of detailed reference material, I'm finding it very difficult to tell one sponge from another - this is possibly Haplistion sp. which is common in Derbyshire Cracoan reefs to the south of here.

It's partially silicified which is the only reason it was visible at all - as the section shows, it's otherwise rather ghostlike.

About 30mm diameter, apparently cylindrical.

Namurian, Great Limestone.



Section about 1cm behind exposed surface:

Edited by TqB 2014-08-05 13:30:27
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Excellent sponge - I think it would have looked like this domed one originally (locked behind a paywall but you can still see the pictures).

I'm sure Joe can help you - these silica replaced fossils you find are really unusual - you have a conservation type lagerstƒÆ’‚¤tten on your hands there :)
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Thanks, Ryan! The specimen certainly peters out inside the rock within 4cm so you may well be right about a dome.

I actually have the paper but hadn't noticed that illustration.
Also another one by Rigby and Mundy (2000) on Carb. sponges from Craven.
And the revised Treatise so if I can digest that lot I might end up with some idea of what I'm finding - it's much harder than corals...

I'll run it past Joe - I don't think it's his sort of sponge but he'll certainly know more than I do...

Edited by TqB 2014-08-05 20:58:35
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