Signatures of early microbial life from the Archean (4 to 2.5 Ga) eon
K Lepot - Earth-Science Reviews, 2020 - Elsevier
Abstract The Archean era (4 to 2.5 billion years ago, Ga) yielded rocks that include the
oldest conclusive traces of life as well as many controversial occurrences. Carbonaceous …
oldest conclusive traces of life as well as many controversial occurrences. Carbonaceous …
Triple oxygen isotope evidence for limited mid-Proterozoic primary productivity
The global biosphere is commonly assumed to have been less productive before the rise of
complex eukaryotic ecosystems than it is today. However, direct evidence for this assertion …
complex eukaryotic ecosystems than it is today. However, direct evidence for this assertion …
Ocean redox structure across the Late Neoproterozoic Oxygenation Event: a nitrogen isotope perspective
The end of the Neoproterozoic Era (1000 to 541 Ma) is widely believed to have seen the
transition from a dominantly anoxic to an oxygenated deep ocean. This purported redox …
transition from a dominantly anoxic to an oxygenated deep ocean. This purported redox …
Application of sulfur and carbon isotopes to oil–source rock correlation: A case study from the Tazhong area, Tarim Basin, China
Up until now, it has been assumed that oil in the Palaeozoic reservoirs of the Tazhong Uplift
was derived from Upper Ordovician source rocks. Oils recently produced from the Middle …
was derived from Upper Ordovician source rocks. Oils recently produced from the Middle …
Comparative microbial diversity and redox environments of black shale and stromatolite facies in the Mesoproterozoic Xiamaling Formation
The composition of microbial communities and their relationship to ocean redox structure in
the Precambrian are topics of continuing interest in geobiology. Our knowledge of …
the Precambrian are topics of continuing interest in geobiology. Our knowledge of …
Lipid taphonomy in the Proterozoic and the effect of microbial mats on biomarker preservation
MM Pawlowska, NJ Butterfield, JJ Brocks - Geology, 2013 - pubs.geoscienceworld.org
The pre-Ediacaran biomarker record has several characteristic features that distinguish it
from its Phanerozoic counterpart, including high concentrations of unresolved complex …
from its Phanerozoic counterpart, including high concentrations of unresolved complex …
Late acquisition of the rTCA carbon fixation pathway by Chlorobi
The reverse tricarboxylic acid (rTCA) cycle is touted as a primordial mode of carbon fixation
due to its autocatalytic propensity and oxygen intolerance. Despite this inferred antiquity …
due to its autocatalytic propensity and oxygen intolerance. Despite this inferred antiquity …
Texture-specific isotopic compositions in 3.4 Gyr old organic matter support selective preservation in cell-like structures
K Lepot, KH Williford, T Ushikubo, K Sugitani… - … et Cosmochimica Acta, 2013 - Elsevier
Abundant cell-like organic structures have been proposed as microfossils in Paleoarchean
(3.2–3.5 Ga) cherts. The wide range of δ13Corg values recorded in Paleoarchean organic …
(3.2–3.5 Ga) cherts. The wide range of δ13Corg values recorded in Paleoarchean organic …
[HTML][HTML] Compound-specific carbon isotope measurements of individual lipid biomarkers from immature Ediacaran rocks of Baltica
Compound-specific carbon isotope ratios (CSIA) were measured for a suite of lipid
biomarker compounds extracted from immature, late Ediacaran sedimentary rocks from drill …
biomarker compounds extracted from immature, late Ediacaran sedimentary rocks from drill …
Bisnorgammacerane traces predatory pressure and the persistent rise of algal ecosystems after Snowball Earth
LM Van Maldegem, P Sansjofre, JWH Weijers… - Nature …, 2019 - nature.com
Eukaryotic algae rose to ecological relevance after the Neoproterozoic Snowball Earth
glaciations, but the causes for this consequential evolutionary transition remain enigmatic …
glaciations, but the causes for this consequential evolutionary transition remain enigmatic …