New fossil hunter looking for expert advice on fossil ID

[Trage]

Hi everyone

 

I have just started looking for fossils and found one yesterday at Lulworth Cove that I think is really interesting. My Mum told me that the holes in this rock are may be from a sponge but we don't know what type. We also noticed a very interesting shell shape on the side of the rock. Does anyone have an idea what this might be? There are very thin cracks in the rock too and we were wondering if there might be something else inside! 

 

Thanks so much for any information you might be able to share. If more photos would be helpful let me know and I can upload more.

 

T. 

[TqB]

Welcome to the forum!

The holes are U shaped burrows made by a modern marine annelid (worm), probably Polydora ciliata. They can burrow into shell and rock.

 

The bivalve is an Inoceramid. There are several genera in the Chalk but look up Inoceramus for similar specimens.

Edited June 5, 2021 by TqB