Browsing FAS Scholarly Articles by Keyword "Neoproterozoic"
Now showing items 1-13 of 13
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Agglutinated tests in post-Sturtian cap carbonates of Namibia and Mongolia
(Elsevier BV, 2011)Paleomagnetic data suggest that the early Cryogenian (Sturtian) glaciation extended to sea level at low latitude. The impact of this dramatic environmental change on biota, and the composition of ecosystems in the immediate ... -
Chuar Group of the Grand Canyon: Record of Breakup of Rodinia, Associated Change in the Global Carbon Cycle, and Ecosystem Expansion by 740 Ma
(Geological Society of America, 2000)The Chuar Group (similar to 1.600 m thick) preserves a record of extensional tectonism, ocean-chemistry fluctuations, and biological diversification during the late Neoproterozoic Era. An ash layer from the top of the ... -
Fossil Preservation in the Neoproterozoic Doushantuo Phosphorite Lagerstatte, South China
(Universitetsforlaget, 1999)Phosphorites of the late Neoproterozoic Doushantuo Formation exposed in the vicinity of Weng'an, Guizhou Province, and Chadian, Shaanxi Province, South China, contain exceptionally well-preserved algal thalli, acritarchs, ... -
Late Ediacaran Redox Stability and Metazoan Evolution
(Elsevier, 2012)The Neoproterozoic arrival of animals fundamentally changed Earth's biological and geochemical trajectory. Since the early description of Ediacaran and Cambrian animal fossils, a vigorous debate has emerged about the drivers ... -
Learning to Tell Neoproterozoic Time
(Elsevier, 2000)In 1989, the International Commission on Stratigraphy established a Working Group on the Terminal Proterozoic Period. Nine years of intensive, multidisciplinary research by scientists from some two dozen countries have ... -
Microbial facies in a Sturtian cap carbonate, the Rasthof Formation, Otavi Group, northern Namibia
(Elsevier BV, 2010)Microbial structures in Neoproterozoic cap carbonates record the environmental processes present in the aftermath of global glaciation. The Rasthof Formation of northern Namibia is a unique carbonate depositional sequence ... -
Microstructures in Metasedimentary Rocks from the Neoproterozoic Bonahaven Formation, Scotland: Microconcretions, Impact Spherules, or Microfossils?
(Elsevier BV, 2013)Microscopic spherules in relatively undeformed mudstones of the Neoproterozoic Bonahaven Formation, Islay, Scotland, are differentiated from their matrix by a sharp micron-scale, smoothly rounded boundary. These elongate ... -
Molar Tooth Structures in Calcareous Nodules, Early Neoproterozoic Burovaya Formation, Turukhansk Region, Siberia
(Elsevier, 2003)Molar tooth structures are abundant in large (1-2 m diameter) carbonate nodules within fine-grained, subtidal carbonates of the early Neoproterozoic (lower Upper Riphean) Burovaya Formation along the Sukhaya Tunguska River, ... -
Molybdenum evidence for expansive sulfidic water masses in ~750Ma oceans
(Elsevier BV, 2011)The Ediacaran appearance of large animals, including motile bilaterians, is commonly hypothesized to reflect a physiologically enabling increase in atmospheric and oceanic oxygen abundances (pO2). To date, direct evidence ... -
Neoproterozoic glaciation on a carbonate platform margin in Arctic Alaska and the origin of the North Slope subterrane
(Geological Society of America, 2009)The rotation model for the opening of the Canada Basin of the Arctic Ocean predicts stratigraphic links between the Alaskan North Slope and the Canadian Arctic islands. The Katakturuk Dolomite is a 2080-m-thick Neo protero ... -
New Lu-Hf and Pb-Pb Age Constraints on the Earliest Animal Fossils
(Elsevier, 2002)The Neoproterozoic Doushantuo Formation, South China, preserves a unique assemblage of early multicellular fossils and overlies rocks, which are thought to have formed during an ice age of global extent. The age of this ... -
Phosphatized Multicellular Algae in the Neoproterozoic Doushantuo Formation, China, and the Early Evolution of Florideophyte Red Algae
(Botanical Society of America, 2004)Phosphatic sediments of the Late Neoproterozoic (ca. 600 million years old [Myr]) Doushantuo Formation at Weng'an, South China, contain fossils of multicellular algae preserved in anatomical detail. As revealed by light ... -
Triple oxygen and multiple sulfur isotope constraints on the evolution of the post-Marinoan sulfur cycle
(Elsevier BV, 2016)Triple oxygen isotopes within post-Marinoan barites have played an integral role in our understanding of Cryogenian glaciations. Reports of anomalous View the MathML source values within cap carbonate hosted barites however ...