Fossil bone is very distinctive in that it has a porous structure just like modern bone. Very often, the open pores are filled with white calcite, but they can also be preserved (as in this example) with a very open structure. Notice that a small area of the bone surface has been preserved – here the structure is much more closed to give strength to the outside of the bone.
Due to the size, bulk and location of this specimen, it is most likely to be a piece of dinosaur that was rolled down a river and deposited during the Lower Cretaceous Wealden times.
Find out more on the reptiles pages.