I picked this up in my garden in Cambridgeshire. It's a modest-sized spherical "pebble", although one aspect is conical; the surface over the spherical component has a pitted pattern. The conical part is smooth. I suspect it's some sort of fossilised marine entity, but I would appreciate knowing exactly what it is, if anyone can point me in the right direction please?
[ Invalid Attachment ]
[ Invalid Attachment ]