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Teleoceras major Teleoceras is the most common fossil in the Ashfall Fossil Beds of Nebraska. In fact, its remains were so numerous and concentrated that the building housing the greatest concentraion of Ashfall fossils is dubbed the "Rhino Barn". Most of the skeletons are preserved in a nearly complete state. One extraordinary specimen includes the remains of a Teleoceras calf trying to suckle from its mother. From the Tertiary in Nebraska © 2010 University of Nebraska State Museum

the Guardianfrom the Guardian

Fossil Ida: Extraordinary find is 'missing link' in evolution

Ida, one of the most complete primate fossils ever found, a 47-million-year-old human ancestor

Dinosaur Footprints from the cretaceus period (120 million years ago) - Torotoro National Park - Bolivia

Crinoid fossils. Rock containing crinoid (or sea lily) fossils. These are Scyphocrinus elegans crinoids from the Silurian/Devonian period (about 440-360 million years ago). Crinoids are marine echinoderms that appear as early as the Ordovician period (500 million years ago).

Trilobite, which belongs to a group of arthropods that became extinct about 251 million years ago. The species shown is Walliserops trifurcatus, and it was collected from ocean sediments in Morocco that date to the Devonian Age, some 385 to 359 million years ago.

Fossilized dinosaur eggs and embryos reveal a wealth of information about the dinosaur reproduction, development, and behavior. Large dinosaur nests that have been found in the United States, Argentina, and Mongolia showed that some dinosaurs nested in huge groups and that they return to their nesting grounds year after year.

About.com Educationfrom About.com Education

Spinosaurus - Bigger than T. Rex, and Every Bit as Nasty

People say if t-rex and spino went head to head in a fight on land that t-rex would win. Actually spino has a better chance. His long jaw and claws give him the advantage. Also hid bigger than t-rex!!!!T-rex just has a muscular head as a weapon nothing else. Therefore spino would probably win.

SPINOSAURUS (meaning "spine lizard") is a genus of theropod dinosaur which lived in what is now North Africa, from the lower Albian to lower Cenomanian stages of the Cretaceous period, about 112 to 97 million years ago. Spinosaurus may be the largest of all known carnivorous dinosaurs, even larger than Tyrannosaurus and Giganotosaurus. Estimates published in 2005 and 2007 suggest that it was 12.6 to 18 metres (41 to 59 ft) in length and 7 to 20.9 tonnes (7.7 to 23.0 short tons) in weight.

Dunkleosteus--an armored predatory fish from over 350 million years ago. Instead of teeth, it had flat, overlapping plates of bone that worked together like shears.