Journal ArticleDOI
A chronology of Paleozoic sea-level changes.
Bilal U. Haq,Stephen R. Schutter +1 more
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TLDR
A history of sea-level fluctuations for the entire Paleozoic by using stratigraphic sections from pericratonic and cratonic basins is reconstructed, revealing a gradual rise through the Cambrian and a short-lived but prominent withdrawal in response to Hirnantian glaciation.Abstract:
Sea levels have been determined for most of the Paleozoic Era (542 to 251 million years ago), but an integrated history of sea levels has remained unrealized. We reconstructed a history of sea-level fluctuations for the entire Paleozoic by using stratigraphic sections from pericratonic and cratonic basins. Evaluation of the timing and amplitude of individual sea-level events reveals that the magnitude of change is the most problematic to estimate accurately. The long-term sea level shows a gradual rise through the Cambrian, reaching a zenith in the Late Ordovician, then a short-lived but prominent withdrawal in response to Hirnantian glaciation. Subsequent but decreasingly substantial eustatic highs occurred in the mid-Silurian, near the Middle/Late Devonian boundary, and in the latest Carboniferous. Eustatic lows are recorded in the early Devonian, near the Mississippian/Pennsylvanian boundary, and in the Late Permian. One hundred and seventy-two eustatic events are documented for the Paleozoic, varying in magnitude from a few tens of meters to ∼125 meters.read more
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Journal ArticleDOI
Collapsed upwelling and intensified euxinia in response to climate warming during the Capitanian (Middle Permian) mass extinction
TL;DR: In this article, a deep-water section on the margin of the South China continent (lower Yangtze platform margin) region was studied, and the authors found that chemical weathering increased from the Roadian to the Capitanian suggesting a change from a warm-humid to a hot-hued climate.
Journal ArticleDOI
Transient ocean oxygenation at end-Permian mass extinction onset shown by thallium isotopes
TL;DR: In this article, the authors analyzed thallium isotopes from three widely distributed sites in Panthalassa, the largest ocean basin at the time of the end-Permian mass extinction.
Journal ArticleDOI
Unconformity-bounded Upper Paleozoic megasequences in the Beishan Region (NW China) and implications for the timing of the Paleo-Asian Ocean closure
TL;DR: In this paper, a review of the Upper Paleozoic stratigraphic sequences of the Beishan Region is presented, where they are divided into three megasequences (MS) in ascending order: Devonian, Mississippian-Guadalupian and Lopingian, separated by two major unconformities.
Book ChapterDOI
Evolution and Biostratigraphy
TL;DR: In this paper, twelve mini-chapters in Geologic Time Scale 2020 address evolution and biostratigraphy in key micro-and macro-fossil groups, and assist readers in better understanding and appreciating the role played by paleontology in describing and understanding Life on Earth in Deep Time.
References
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Journal ArticleDOI
The Phanerozoic Record of Global Sea-Level Change
Kenneth G. Miller,Michelle A. Kominz,James V. Browning,James D. Wright,Gregory S. Mountain,Miriam E. Katz,Peter J. Sugarman,Benjamin S. Cramer,Nicholas Christie-Blick,Stephen F. Pekar +9 more
TL;DR: Long-term sea level peaked at 100 ± 50 meters during the Cretaceous, implying that ocean-crust production rates were much lower than previously inferred, and presents a new sea-level record for the past 100 million years.
Journal ArticleDOI
Synchronizing Rock Clocks of Earth History
Klaudia F. Kuiper,Klaudia F. Kuiper,Alan L. Deino,Frederik J Hilgen,Wout Krijgsman,Paul R. Renne,Paul R. Renne,Jan R. Wijbrans +7 more
TL;DR: This calibration of tephras in marine deposits in Morocco to calibrate the age of Fish Canyon sanidine provides tight constraints for the astronomical tuning of pre-Neogene successions, resulting in a mutually consistent age of ∼65.95 Ma for the Cretaceous/Tertiary boundary.
Journal ArticleDOI
Sequences in the Cratonic Interior of North America
TL;DR: The concept of major rock-stratigraphic units of interregional scope was introduced in 1948 by Longwell, 1949 as discussed by the authors, and the sedimentary record of the North American craton from late Precambrian to present is characterized by six major unconformities.
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The Concise Geologic Time Scale
TL;DR: For a detailed discussion of the international divisions of geologic time, see as discussed by the authors, where the authors present the standard colors for the international division of geology time scales in detail.
Journal ArticleDOI
Long-Term Sea-Level Fluctuations Driven by Ocean Basin Dynamics
TL;DR: A mantle convection model is used to suggest that New Jersey subsided by 105 to 180 meters in the past 70 million years because of North America's westward passage over the subducted Farallon plate, which reconciles New Jersey margin–based sea-level estimates with ocean basin reconstructions.