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CaptainJoe
In a lump of chalk on the south downs in Sussex. Approximatley 150mm wide.Would this be a plant or animal ? Many thanks  20200530_143019.jpg 
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Brittle Star
Can you say what the dimensions are or take a photo with a ruler by it. My first impression is echinoid but it looks like other things are going on aswell. Wait for other opinions
JW

 Never ask a star fish for directions
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Richard
The sponge Siphonia 
Richard
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CaptainJoe
The chalk lump is around 150mm diameter. Bit heavy to take back home as I was halfway through a long walk !!
Thank you for the identifications
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Weald on Bed
That circular bit in the middle is the basal disk of the sponge  - i.e. where it would have attached itself to the seabed.
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Gerald Gibson
That is either a sponge or possibly a jelly fish.  I saw a jelly fish fossil that looked like this.  THIS IS VERY INTERESTING!
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prep01
Gerald - jelly fish are as rare as hen's teeth!
Colin Huller
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Gary W
Definately a sponge, as prep01 stated fossil jellyfish are very very rare as they have no hard parts.  They only fossilise in exceptional conditions such as the Solnhofen limestone or Mazon Creek nodules.
Gary
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