Melanin, and other pigments have recently been shown to preserve over geologic time
scales, and are found in several different organisms. This opens up the possibility of …

Hot spring environments are commonly dominated by silica sinters that precipitate by the
rapid cooling of silica-saturated fluids and the activity of microbial communities. However …

Recognizing fossil microorganisms is essential to the study of life's origin and evolution and
to the ongoing search for life on Mars. Purported fossil microbes in ancient rocks include …

The origin of trees by the mid-Devonian epoch (398–385 million years ago) signals a major
change in terrestrial ecosystems with potential long-term consequences including increased …

The oldest putative microfossils on Earth occur in the 3.5 Ga Apex chert of the Warrawoona
Group, Western Australia. We have analyzed disseminated interstitial carbon found within …

Abstract The Early Devonian Rhynie chert preserves the earliest terrestrial ecosystem and
informs our understanding of early life on land. However, our knowledge of the 3D structure …

The presence and distribution of preserved organic matter on the surface of Mars can
provide key information about the Martian carbon cycle and the potential of the planet to host …