I found this In Ossett, West Yorkshire, UK and if it's a fossil it's carboniferous in age. At first, I though it looked like an imprint of a pine cone, but I don't think it is any more, but I presume from the age is it some kind of plant fossil... Or is it just a rock?
I have also included a picture of a cast of it, made by blue tack .
Hi again. I've managed to make a much better cast of it (I'll post images tommorow). It looks a bit like my tortoises foot, so could it be either an amphibian foot print or a very early reptile foot print or is it just a strange shaped rock?
I think this is an ironstone concretion, of the type called a septarian nodule.
It looks unusual because weathering has removed some of the constituents, leaving what the veins standing proud.
Do a Google search on 'septarian nodule' and you'll find many examples, some of which are rather nice!
As promised a couple of images of a septarian nodule containing a Phylloceras sp ammonite.
The Lower Jurassic - Upper Lias ammonite is 10in across and would have been a fantastic specimen, but I have it in my collection because I think it is a good representative fossil in a septarian nodule were you can see the quarts crystals that have helped to fracture the nodule.
Found on the Holderness coast.