20 terms


geologic time
the period of time covering the formation of the earth and developmentof the earth, from about 4.6 billion years ago to today
the scientific study of the earth along with its rocks, minerals, landforms and life forms. It also includes the processes that have affected them over the course of the Earth's history.
to preserve remains or evidence of prehistoric animals
the scientists who study the forms of life that existed in earlier geologic periods mainly by studying fossils
to undergo changes in development
a specialized feature that makes an animal or plant better suited for it's particular environment
any group of prehistoric animals that lived between 225 and 65 million years ago. Lived on land. Stood upright, did not sprawl and had a reptile like appearance
no longer living anywhere on earth
a mark or depression made by pressure
a class of terrestrial cold blooded animals that have backbones, lungs and scaly skin
scientific name
a name derived from greek or latin terms that is given to a plant or animal and used similarly by scientists around the world
a position of the body of the legs spread out and the belly close to the ground as with a crocodile
the distance travelled in a single step
a visual representation of the passage of time showing important scientific or cultural events
a series of dinosaur footprints preserved in rock
a prehistoric invertibrate, now extinct, that was once common throughout the earths oceans
precambrian era
the time from when the earth formed and simple life forms evolved
paleozoic era
(the age of ancient life) occurred 600-245 million years ago. It saw an explosion of new life forms. It ended with the largest mass extinction in history.
mesozoic era
(the age of the reptiles) Occurred from 245-65 million years ago. It is divided into triasic, jurrasic and cretateous periods. Dinosaurs, mammals and flowering plants evolved during the mesozoic, and pangaea broke up. Ended with the k-t mass extinction.
cenozoic era
(the age of the mammals) From 65 million years ago to today. It saw the emergence of the familiar life forms, humans, the modern look of the continents and the cooling climate