The Cambrian time period from 500 to 600 million years ago was also known as the Cambrian explosion. The Ordovician time period from 490 to 500 million years ago was found through the study of whales. The Devonian period was 405 to 560 million years ago and was the time of the evolution of sharks. The carboniferous period was 290 to 560 million years ago and was a time of large dragonflies. The Triassic period was 250 to 290 million years ago was when 90 percent of the worlds species died off. The Jurassic time was 140 to 210 million years ago and was a time of pangea when it was drifting apart. The cretaceous period was 65 to 140 million years ago and was a time of warm blooded mammals. The tertiary time period was 2 to 65 million years ago and was the time of the deep freeze known as thee ice age. This project was a very useful activity used to learn a lot about different time periods. I gained knowledge of how we came to be through all the years of different species. My contribution was organized and very helpful.