This preview shows page 1. Sign up to view the full content.
Unformatted text preview: of Continental Glaciation Duration 2300 m.y. 200 m.y. 900 m.y. 50 m.y. 750 m.y. 50 m.y. 600 m.y 20 m.y. 450 m.y. 25 m.y. 300 m.y. 50 m.y. now 2 m.y. so far in North America Luminosity of Sun Origin of Sun and Earth Today Oceans Boil Red Giant White Dwarf Black Dwarf First shelled animals evolved about 535 m.y. ago. Dinosaurs first appeared about 200 m.y. ago. Dinosaurs became extinct about 65 m.y. ago, perhaps due to a large meteorite impact. First humanoids appeared about 7 m.y. ago. Pleistocene or ice ages began about 2 m.y. ago. Glacial and interglacial periods cycle with a period of about 100,000 years. Interglacial periods are about 10,000 years in duration First modern humans appeared about 120,000 years ago. Peak of last glaciation occurred about 20,000 years ago. Sea level was 400 feet lower Long Island was not an Island then End of last glaciation began about 10,000 years ago. We are presently in an interglacial period. Agriculture started about 10,000 years ago....
View Full Document
- Fall '08