Results 11 to 20 of about 9,888 (286)

ASTRONOMICAL CALIBRATION OF THE FAMENNIAN (UPPER DEVONIAN) TIME SCALE [PDF]

Geological Society of America Abstracts with Programs, 2017
The Late Devonian was affected by major, irreversible changes including two of the most severe biodiversity crises in Earth’s history, the so-called Kellwasser and Hangenberg Events (respectively near the Frasnian – Famennian (F-F) and the Devonian – Carboniferous (D-C) boundaries).
Pas, D., Hinnov, Linda, Day, Jed, Kodama, K., Sinnesael, Matthias, Liu, Wei   +5 more
openaire   +4 more sources

Scale Marking Method on the Circumference of Circle Elements for Astronomical Instruments in the Early Joseon Dynasty [PDF]

Journal of Astronomy and Space Sciences, 2015
During the reign of King Sejong (世宗, 1418-1450) in the Joseon Dynasty, there were lots of astronomical instruments, including miniaturized ones. Those instruments utilized the technical know-how acquired through building contemporary astronomical ...
Byeong-Hee Mihn, Ki-Won Lee, Young Sook Ahn, Yong Sam Lee   +3 more
doaj   +2 more sources

Astronomical Time Scale of the Late Pleistocene in the Northern South China Sea Based on Carbonate Deposition Record

Journal of Marine Science and Engineering
Variations in solar insolation caused by changes in the Earth’s orbit—specifically its eccentricity, obliquity, and precession—can leave discernible marks on the geologic record.
Chunhui Zhang, Wanyi Zhang, Chengjun Zhang, Liwei Zheng, Shiyi Yan, Yuanhao Ma, Wei Dang   +6 more
doaj   +2 more sources

Cyclostratigraphy of Lower Permian alkaline lacustrine deposits in the Mahu Sag, Junggar basin and its stratigraphic implication

Frontiers in Earth Science, 2023
The Lower Permian Fengcheng Formation of the Mahu Sag is one of the most potentially petroliferous sequences in China, and its unique alkaline lacustrine deposits provide important information on the paleoclimate and paleoenvironment of the early Permian.
Yong Tang, Wenjun He, Ran Wang, Haijiao Ren, Zhijun Jin, Zhuang Yang, Zhuang Yang, Yuanyuan Zhang, Yuanyuan Zhang   +8 more
doaj   +1 more source

Milankovitch cycles and the astronomical time scale of the Zhujiang Formation in the Baiyun Sag, Pearl River Mouth Basin, China

Open Geosciences, 2022
The Zhujiang Formation in the Baiyun Sag, Pearl River Mouth Basin, China, is formed primarily in a deep-water continental slope environment. Its chronostratigraphic framework is based on biostratigraphy and sequence stratigraphy, and its geological ...
He Ping, Zhang Shangfeng, Xu Enze, Zhu Chunxia   +3 more
doaj   +1 more source

Middle Miocene-Pleistocene Magneto-Cyclostratigraphy from IODP Site U1501 in the Northern South China Sea

Frontiers in Earth Science, 2022
Site U1501 of International Ocean Discovery Program (IODP) Expedition 368 locates on a broad regional basement high in the northern margin of the South China Sea (SCS).
Meinan Shi, Meinan Shi, Meinan Shi, Huaichun Wu, Huaichun Wu, Huaichun Wu, Eric C. Ferré, Sara Satolli, Qiang Fang, Qiang Fang, Qiang Fang, Yunfeng Nie, Yunfeng Nie, Yunfeng Nie, Yuhe Qin, Yuhe Qin, Yuhe Qin, Shihong Zhang, Tianshui Yang, Haiyan Li   +19 more
doaj   +1 more source

Astronomical Instruments with Two Scales Drawn on Their Common Circumference of Rings in the Joseon Dynasty [PDF]

Journal of Astronomy and Space Sciences, 2017
This study examines the scale unique instruments used for astronomical observation during the Joseon dynasty. The Small Simplified Armillary Sphere (小簡儀, So-ganui) and the Sun-and-Stars Time-Determining Instrument (日星定時儀, Ilseong-jeongsi-ui) are ...
Byeong-Hee Mihn, Goeun Choi, Yong Sam Lee   +2 more
doaj   +1 more source

Synchronizing rock clocks in the late Cambrian

Nature Communications, 2022
The Cambrian is the most poorly dated period of the past 541 million years. Here, the authors present a new astronomical time scale, allowing for a first assessment, in numerical time, of the evolution of major biotic and abiotic changes that ...
Zhengfu Zhao, Nicolas R. Thibault, Tais W. Dahl, Niels H. Schovsbo, Aske L. Sørensen, Christian M. Ø. Rasmussen, Arne T. Nielsen   +6 more
doaj   +1 more source

Extracting causation from millennial-scale climate fluctuations in the last 800 kyr

Scientific Reports, 2022
The detection of cause-effect relationships from the analysis of paleoclimatic records is a crucial step to disentangle the main mechanisms at work in the climate system.
Marco Baldovin, Fabio Cecconi, Antonello Provenzale, Angelo Vulpiani   +3 more
doaj   +1 more source

Reconstruction of Lake-Level Changes by Sedimentary Noise Modeling (Dongying Depression, Late Eocene, East China)

Energies, 2023
The late Eocene succession of the Dongying Depression forms a highly productive hydrocarbon source. However, due to lack of an unambiguous fine chronostratigraphic framework for the late Eocene stratigraphy, it is challenging to understand the paleolake ...
Zhongheng Sun, Tao Jiang, Hongtao Zhu, Xinluo Feng, Pengli Wei   +4 more
doaj   +1 more source