Your specimen might be one of the more unusual types of fossil, and it would be worth doing some further research to find out what it is. Sometimes the bones and teeth of mammals are fossilised, insects are trapped in amber or, very rarely, the soft parts of animals like skin and muscles are preserved. If you think you have an unusual fossil you could take it to a museum to be identified or could do some research in your local library.
The fossil keys in this online exhibition cover the most common fossils found in The Potteries but don't mention everything that has ever been found here. The large, cow like fossil in the picture above is the skull of an auroch (a type of wild mammal which is now extinct) which was found in 1877 during work at Etruria railway station.