Search Results - "Porter, Susannah"

Tiny vampires in ancient seas: evidence for predation via perforation in fossils from the 780–740 million-year-old Chuar Group, Grand Canyon, USA by Porter, Susannah M.

“…One explanation for the Early Neoproterozoic expansion of eukaryotes is the appearance of eukaryovorous predators—i.e. protists that preyed on other protists…”
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Insights into eukaryogenesis from the fossil record by Porter, Susannah M

“…Eukaryogenesis-the process by which the eukaryotic cell emerged-has long puzzled scientists. It has been assumed that the fossil record has little to say about…”
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Frameworks for Interpreting the Early Fossil Record of Eukaryotes by Porter, Susannah M, Riedman, Leigh Anne

“…The origin of modern eukaryotes is one of the key transitions in life's history, and also one of the least understood. Although the fossil record provides the…”
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Seawater Chemistry and Early Carbonate Biomineralization by Porter, Susannah M

“…The first appearances of aragonite and calcite skeletons in 18 animal clades that independently evolved mineralization during the late Ediacaran through the…”
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Evolution: Ancient Fossilized Amoebae Find Their Home in the Tree by Porter, Susannah M., Riedman, Leigh Anne

“…Ancestral test morphologies predicted from a new phylogeny of arcellinid amoebae show a striking resemblance to microscopic fossilized tests found worldwide in…”
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Biomineralization by particle attachment in early animals by Gilbert, Pupa U. P. A., Porter, Susannah M., Sun, Chang-Yu, Xiao, Shuhai, Gibson, Brandt M., Shenkar, Noa, Knoll, Andrew H.

“…Crystallization by particle attachment (CPA) of amorphous precursors has been demonstrated in modern biomineralized skeletons across a broad phylogenetic range…”
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Systematics of organic-walled microfossils from the ca. 780–740 Ma Chuar Group, Grand Canyon, Arizona by Porter, Susannah M, Riedman, Leigh Anne

“…The ca. 780–740 Ma Chuar Group, Grand Canyon, Arizona, provides an exceptional record of life during the diversification of crown-group eukaryotes, just prior…”
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On the co‐evolution of surface oxygen levels and animals by Cole, Devon B., Mills, Daniel B., Erwin, Douglas H., Sperling, Erik A., Porter, Susannah M., Reinhard, Christopher T., Planavsky, Noah J.

“…Few topics in geobiology have been as extensively debated as the role of Earth's oxygenation in controlling when and why animals emerged and diversified. All…”
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Organic-walled microfossils of the mid-Neoproterozoic Alinya Formation, Officer Basin, Australia by Riedman, Leigh Anne, Porter, Susannah

“…Estimates of Precambrian eukaryotic diversity and disparity indicate broad trends of increase in the Mesoproterozoic Era, leading to a peak and then rapid…”
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Phosphatic scales in vase‐shaped microfossil assemblages from Death Valley, Grand Canyon, Tasmania, and Svalbard by Riedman, Leigh Anne, Porter, Susannah M., Czaja, Andrew D.

“…Although biomineralized skeletal elements dominate the Phanerozoic fossil record, they did not become common until ~550–520 Ma when independent acquisitions of…”
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Fossilisation processes and our reading of animal antiquity by Anderson, Ross P., Woltz, Christina R., Tosca, Nicholas J., Porter, Susannah M., Briggs, Derek E.G.

“…The last common ancestor of animals is thought to have been small and soft-bodied and therefore would have required special conditions for its…”
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Strong evidence for a weakly oxygenated ocean-atmosphere system during the Proterozoic by Wang, Changle, Lechte, Maxwell A, Reinhard, Christopher T, Asael, Dan, Cole, Devon B, Halverson, Galen P, Porter, Susannah M, Galili, Nir, Halevy, Itay, Rainbird, Robert H, Lyons, Timothy W, Planavsky, Noah J

“…Earth's surface has undergone a protracted oxygenation, which is commonly assumed to have profoundly affected the biosphere. However, basic aspects of this…”
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Plywood‐like shell microstructures in hyoliths from the middle Cambrian (Drumian) Gowers Formation, Georgina Basin, Australia by Moore, J. L., Porter, Susannah M., Sigwart, Julia

“…Hyoliths are a group of Palaeozoic fossils with calcareous shells whose affinities remain controversial. As their shells were originally aragonitic, their…”
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Chromium evidence for protracted oxygenation during the Paleoproterozoic by Mänd, Kaarel, Planavsky, Noah J., Porter, Susannah M., Robbins, Leslie J., Wang, Changle, Kreitsmann, Timmu, Paiste, Kärt, Paiste, Päärn, Romashkin, Alexander E., Deines, Yulia E., Kirsimäe, Kalle, Lepland, Aivo, Konhauser, Kurt O.

“…It has commonly been proposed that the development of complex life is tied to increases in atmospheric oxygenation. However, there is a conspicuous gap in time…”
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An emerging picture of Neoproterozoic ocean chemistry: Insights from the Chuar Group, Grand Canyon, USA by Johnston, David T., Poulton, Simon W., Dehler, Carol, Porter, Susannah, Husson, Jon, Canfield, Donald E., Knoll, Andrew H.

“…Detailed iron, sulfur and carbon chemistry through the > 742 million year old Chuar Group reveals a marine basin dominated by anoxic and ferrous iron-rich…”
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A template for an improved rock-based subdivision of the pre-Cryogenian timescale by Shields, Graham A., Strachan, Robin A., Porter, Susannah M., Halverson, Galen P., Macdonald, Francis A., Plumb, Kenneth A., de Alvarenga, Carlos J., Banerjee, Dhiraj M., Bekker, Andrey, Bleeker, Wouter, Brasier, Alexander, Chakraborty, Partha P., Collins, Alan S., Condie, Kent, Das, Kaushik, Evans, David A. D., Ernst, Richard, Fallick, Anthony E., Frimmel, Hartwig, Fuck, Reinhardt, Hoffman, Paul F., Kamber, Balz S., Kuznetsov, Anton B., Mitchell, Ross N., Poiré, Daniel G., Poulton, Simon W., Riding, Robert, Sharma, Mukund, Storey, Craig, Stueeken, Eva, Tostevin, Rosalie, Turner, Elizabeth, Xiao, Shuhai, Zhang, Shuanhong, Zhou, Ying, Zhu, Maoyan

“…The geological timescale before 720 Ma uses rounded absolute ages rather than specific events recorded in rocks to subdivide time. This has led increasingly to…”
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Organic preservation of vase‐shaped microfossils from the late Tonian Chuar Group, Grand Canyon, Arizona, USA by Tingle, Kelly E., Porter, Susannah M., Raven, Morgan R., Czaja, Andrew D., Webb, Samuel M., Bloeser, Bonnie

“…Vase‐shaped microfossils (VSMs) are found globally in middle Neoproterozoic (800–730 Ma) marine strata and represent the earliest evidence for testate…”
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A sedimentary record of the evolution of the global marine phosphorus cycle by Planavsky, Noah J., Asael, Dan, Rooney, Alan D., Robbins, Leslie J., Gill, Benjamin C., Dehler, Carol M., Cole, Devon B., Porter, Susannah M., Love, Gordon D., Konhauser, Kurt O., Reinhard, Christopher T.

“…Phosphorus (P) is typically considered to be the ultimate limiting nutrient for Earth's biosphere on geologic timescales. As P is monoisotopic, its sedimentary…”
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SKELETAL MICROSTRUCTURE INDICATES CHANCELLORIIDS AND HALKIERIIDS ARE CLOSELY RELATED by PORTER, SUSANNAH M.

“…:  Chancelloriids are problematic, sac‐like animals whose sclerites are common in Cambrian fossil assemblages. They look like sponges, but were united with the…”
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Chancelloriid sclerites from the Lower Cambrian (Meishucunian) of eastern Yunnan, China, and the early history of the group by Moore, John L., Li, Guoxiang, Porter, Susannah M., Lane, Phil

“…Chancelloriids are a group of enigmatic sessile animals that are covered with sclerites shaped as rosettes of spines, producing an appearance like that of a…”
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