Geologic+Time+Notes+6-9

Did you know that scientists first study one of the fossils and rocks they found and then they date them. And also fossils indicate the climate that the fossil had lived in. The oldest fossils date back to about 3 million years ago! In the Jarrasic era. Pangea had started to spread apart, Plus the first dinosaurs appeared. The first birds had also appeared in Jurrasic era. Oceans full of fish and squid. Ferns had dominated by dry land.

Scientists believe that Earth started out as a cloud of dust and slowly came together. They also believe that bacteria was the only living creature a that time and then they eloved in fish and other sea creatures and then on and on and on to difernt animals. Thomas Mascia

7/8 of earth's history is precambrian time. the other 1/8 of earth's history is called the Phanozoic eon. A eon is the largest subdivision of time. In eons there are eras. In eras there are period, and in periods there are epochs. Epochs are the smallest subdivision of time.

Pangaea started to brake apart in the mesozoic era. in this period birds and dinosaurs appeared. also that scientists could tell waht time period fossils were from by investigating them Katherine Medrano

Scientist believed that earth started as a big cloud. Also bacteria was the only living creature. Pangaea started to brake in the Mesozoic era. Theresa Sloan

The Paleozoic Era took up half of the Phanerozoic Eon. Matthew Agoursalidis