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 ...

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 ...

spanning modern environments to Precambrian time. My general philosophy is to use experiments and models to understand some key process – for example, abrasion of carbonate sand – then move to a ...

The Precambrian eon is vast ... producing enough energy and heat to vaporize any water or melt any rock that may be present. Gravity also helps separate heavy elements from lighter ones.

Carbon isotope ratios in 3.8 b.y. rocks (Isua Formation) from Greenland had been suggested to have resulted from organic activity. However a recent (2002) reinterpretation of the rock rock formation ...

More extensive Precambrian finds, particularly those discovered in Australia's Ediacara Gorge in rocks 565 million years old, include fossil imprints of creatures that resemble everything from ...

She holds a PhD from University College London and MSc from Imperial College London Helen’s doctoral research focused on weathering proxy studies, particularly Sr and Li isotopes in Precambrian marine ...