Perfectly preserved for more than 300 million years, this horsetail carries secrets from the Carboniferous period. Primitive vascular plants, horsetails (genus Equisetum) are often found in coal deposits
Paleozoic Mesozoic Cenozoic
Fossilised T-Rex teeth.
Lost World Locked in Stone at Fossil Lake
This fossil immortalizes stingray sex of the Eocene. The male and female fat-tailed stingrays (Asterotrygon maloneyi) shown here were likely mating or just about to mate when they were killed, researchers believe.
Many species of insects are found in the Green River Formation including dragonflies. The wetland margins of Fossil Lake provided ideal breeding and foraging opportunities. View more Green River insect fossils. National Park Service - Fossil Butte National Monument photograph.
Uintacrinus fossil (a crinoid, 65 million years old); from http://selectivefocusphotography.blogspot.com/search?q=fossils
Can you find all the Tyrannosauruses? Fossil Hunting by Amanda Makepeace - Free to download on deviantART.