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Hello again. About 2 years ago I found the following Echinoid (I think) in the northern province of Drenthe in the Netherlands. I was actually looking for interesting rocks and at first I thought that's what I had picked up, a piece of rounded/worn flint or chert. On closer inspection it looked like something that was once alive. Actually thought it was a long dead starfish, but after some googling I 'm fairly certain it's a type of Echinoid like a Conulus or maybe Salenia. Some background info: the area this was found was once covered with glacial ice that originated in Scandinavia, the Saale Glaciation (347,000 to 128,000 years ago). The glacial ice has deposited numerous large erratic boulders from which the famous 'Hunebedden' were constructed some 5,000 years ago. Along with those, heaps of smaller rocks and boulders were also laid down in the northern provinces. I suppose the same glaciers also transported fossils from the Scandinavian countries to this and the surrounding area. This was found on the surface of an area quite unique in the country. A glacial deposit covered in patches of heather and super fine white sand. The top 5 to 10 cm of sand contain loads and loads of smaller rocks of different kinds, so I suspect this Echinoid was deposited along with them and wasn't a species native to this area. Based on some photos from https://www.nhm.ac.uk/our-science/data/echinoid-directory/index.html I'm thinking this is a type of Conulus that lived in the cretaceous but that's as far as I dare to guess. Hoping somebody can further ID or correct my own ID. The specimen is 25mm in width and feels as if it's been worn by sand and wind (which certainly happened to some rocks I found in the same area) Thanks

I found this at low tide after a rowing outing on the foreshore of the tidal section of the river Thames near Hammersmith in London, UK. I have zero experience of fossil ID. From above, I thought it looks like a conulus but I was interested by the hexagonal pattern and two rows of dimples on the underside. Thanks for any info as to what they are and what it might be. Tim