A new archaeology is being developed based on evidence of human activity in the Earth’s sedimentary record, and ...

We will provide a list of web sites with relevant information. The geologic time scale is divided into eons, eras, periods, epochs, and ages. Our activities, and the time scale for download above, ...

What Was Happening on Earth at This Time The Precambrian is the earliest of the geologic ages, which are marked by different layers of sedimentary rock. Laid down over millions of years ...

Microbial distribution, co-occurrence patterns and driving mechanisms in the Yellow River Delta across sedimentary time scales. In this image, the first, second and third plots (A, B and C ...