front 1 Precambrian | back 1 first era of geologic time; origin of the earth |
front 2 paleozoic | back 2 second era of geologic time known for age of fishes and rise of reptiles |
front 3 mesozoic | back 3 third era of geologic time known as the age of dinosaurs |
front 4 cenozoic | back 4 current era of geologic time see the rise of mammals and modern man |
front 5 triassic | back 5 first period of the mesozoic era dinosaurs first appear |
front 6 jurassic | back 6 second period of the mesozoic era |
front 7 cretaceous | back 7 last period of the mesozoic era dinosaurs and many other life forms become extinct at the end of this period |
front 8 replacement | back 8 process of fossil formation when the original material is replaced by mineral deposits |
front 9 carbon imprint | back 9 process of fossil formation that occurs as the original object is compressed to mleave an imprint made of carbon |
front 10 trace fossils | back 10 these are not the remains of animals but burrows footprints and evidence of feeding |
front 11 coprolite | back 11 fossilized dinosaur dung |
front 12 ornithischians | back 12 bird-hipped dinosaurs |
front 13 saurischians | back 13 lizard hipped dinosaurs |