It is well established that greenhouse conditions prevailed during the Cretaceous Period (~
145–66 Ma). Determining the exact nature of the greenhouse-gas forcing, climatic warming …

Glycerol dialkyl glycerol tetraether (GDGT) lipids are membrane lipids which were long
thought to be synthesized mainly by archaea, organisms thought to be limited to extreme …

The early Eocene (56 to 48 million years ago) is inferred to have been the most recent time
that Earth's atmospheric CO2 concentrations exceeded 1000 ppm. Global mean …

It has recently been shown that membrane lipids of marine crenarchaeota, a ubiquitous and
abundant component of plankton, occur in relatively high concentrations in recent and …

Molecular organic geochemical proxies are increasingly being utilized to reconstruct past
environmental conditions as new tools continue to be discovered and developed. To date …

We propose a novel tracer for terrestrial organic carbon in sediments based on the analysis
of tetraether lipids using high-performance liquid chromatography/mass spectrometry …

The oldest known seep deposits with macroinvertebrate taxa are Devonian in age. Although
more and more examples continue to be discovered, the Palaeozoic and Mesozoic record of …

In this study we investigated by using 16S rRNA-based methods the distribution and
biomass of archaea in samples from (i) sediments above outcropping methane hydrate at …

The use of biomarkers in combination with stable isotope analysis is a new approach in
microbial ecology and a number of papers on a variety of subjects have appeared. We will …

Gas hydrates represent one of the largest pools of readily exchangeable carbon on Earth's
surface. Releases of the greenhouse gas methane from hydrates are proposed to be …