these ancient rocks contain the tiny fossilized remains of protists and bacteria, and when University of Wisconsin-Madison geologist Stanley Tyler discovered the first microfossils in Precambrian ...

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 ...

Unusual structures of unknown origin discovered in desert rocks have been documented in a new study. In the desert regions of ...