science vocab. chap. 18
Terms
undefined, object
copy deck
- arangement of rock layers based upon the ages of the rocks
- geologic column
- largest unit of gologic time
- era
- subdivision of a geologic era
- period
- subdivision of a geologic period
- epoch
- earliest and longest geologic era lasting from 4.6 billion to 570 million years ago
- precambrian time
- geologic era that followed precambrian time lasting from 570 million to 245 million years ago
- paleozoic era
- geologic era that lasted from 245 million to 60 million years ago, the age of the reptiles
- mesozoic era
- the most recent geologic era, begining 65 million years ago,the age of the mammals
- cenozoic era
- theory that organisms change over time and that new organisms are derived from ancestral types
- theory of evolution
- animals without backbones
- invertebrates
- animal with a backbone
- vertebrates