Some of the world's best preserved fossils are found in the flat-topped ridges of southwestern Wyoming's cold sagebrush desert. Fossil Butte National Monument is a site that promotes the protection of this world-class paleontological heritage.
An armoured jawless fish (a Cephalaspis, which is a kind of osteostracan). This creature evolved as it adapted to the transition from open sea to freshwater conditions in the Ludlow area towards the end of the Silurian.
Ammonite pavement in Lyme Regis, Dorset, Great Britain - a World Heritage Site. We went fossil hunting at Lyme Regis as kids! I took my husband a few years ago and we only found one fossil! I don't think he believed we used to find loads.