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.
Crinoid fossils are sea lilies and feather stars that attached to the sea bottom, filtered food particles, and boomed in the Paleozoic period when plants dominated the earth. Most of the coal deposits found in the world today are found in association to P
This inch long bat is the most primitive bat known (Eocene Green River Fm). Claws on each finger of its wings indicate it was probably an agile climber and crawled along and under tree branches searching for insects.