Geologic Timeline Signs

Our to-scale geologic timeline is installed along Memorial Drive between Mass. Ave. and Ames St., near Building 1 (map) during the Cambridge Science Festival each year. The timeline is marked by a series of twelve signs describing major events in Earth’s history. To see those signs online, along with accompanying links and descriptions, click on the links below:

The Earth Forms – 4567 million years ago
Oceans and Continents Form – 4400 million years ago
The Origin of Life – 3500 million years ago
The Rise of Oxygen – 2400 million years ago
Eukaryotes Evolve – 1800 million years ago
The Cambrian Radiation – 543 million years ago
Plants move on to Land – 450 million years ago
Animals move on to Land – 430 million years ago
The Permian-Triassic Mass Extinction – 252 million years ago
The Opening of the North Atlantic Ocean – 160 million years ago
Dinosaurs Go Extinct – 65 million years ago
Our species, Homo sapiens, Evolves – 200,000 years ago
How Do We Tell Time?

These signs are posted at the locations indicated on this map: