This specimen of fossil rich sandstone was collected from Hillend in Shropshire. It is from the Pentamerus beds, which are in the upper Llandovery series of the Silurian period. The location is on the S.E margin of the long Mynd. This rock has earned the "nickname" of Government rock, alluding to the characteristic arrows of the pentamerus oblongus which are reflected in prison uniforms of many years ago.