A. Knoll

Publications515
h-index120
Citations47,020
Highly Influential Citations2,996
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Proterozoic Ocean Chemistry and Evolution: A Bioinorganic Bridge?
TLDR
Recent data imply that for much of the Proterozoic Eon, Earth's oceans were moderately oxic at the surface and sulfidic at depth, and biologically important trace metals would have been scarce in most marine environments. Expand
Eukaryotic organisms in Proterozoic oceans
TLDR
Focus on character evolution permits inferences about the innovations in cell biology and development that underpin the taxonomic and morphological diversification of eukaryotic organisms. Expand
Estimating the timing of early eukaryotic diversification with multigene molecular clocks
TLDR
Taxon-rich multigene data combined with diverse fossils and a relaxed molecular clock framework are used to estimate the timing of the last common ancestor of extant eukaryotes and the divergence of major clades, suggesting that long stems preceded diversification in the major eUKaryotic lineages. Expand
Large Perturbations of the Carbon Cycle During Recovery from the End-Permian Extinction
High-resolution carbon isotope measurements of multiple stratigraphic sections in south China demonstrate that the pronounced carbon isotopic excursion at the Permian-Triassic boundary was not an… Expand
The Evolution of Modern Eukaryotic Phytoplankton
TLDR
The geological, geochemical, and biological processes that contributed to the rise of the dinoflagellates, coccolithophores, and diatoms all contain plastids derived from an ancestral red alga by secondary symbiosis are examined. Expand
Neoproterozoic variations in the C-isotopic composition of seawater: stratigraphic and biogeochemical implications.
The recent proliferation of stratigraphic studies of delta 13C variation in carbonates and organic C in later Neoproterozoic and basal Cambrian successions (approximately 850-530 Ma) indicates a… Expand
Stromatolites in Precambrian carbonates: evolutionary mileposts or environmental dipsticks?
TLDR
Application of a process-based approach has shown that stromatolites were originally formed largely through in situ precipitation of laminae during Archean and older Proterozoic times, but that younger ProTerozoic strom atolites grew largely through the accretion of carbonate sediments, most likely through the physical process of microbial trapping and binding. Expand
Biomarker evidence for green and purple sulphur bacteria in a stratified Palaeoproterozoic sea
TLDR
Hydrocarbon biomarkers from a 1.64-Gyr-old basin in northern Australia reveal a marine basin with anoxic, sulphidic, sulphate-poor and permanently stratified deep waters, hostile to eukaryotic algae, and support mounting evidence for a long-lasting Proterozoic world in which oxygen levels remained well below modern levels. Expand
Morphological and ecological complexity in early eukaryotic ecosystems
TLDR
It is shown that the cytoskeletal and ecological prerequisites for eukaryotic diversification were already established in eukARYotic microorganisms fossilized nearly 1,500 Myr ago in shales of the early Mesoproterozoic Roper Group in northern Australia. Expand
Life on a Young Planet: The First Three Billion Years of Evolution on Earth
TLDR
The Tree of Life is a posthumous publication based on a manuscript originally written by Gordon C. Dickinson in 2016 and then edited by David I. Dickinson. Expand
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