Using geophysical logs to identify Milankovitch cycles and to calculate net primary productivity (NPP) of the Late Permian coals, western Guizhou, ChinaSpringer Science and Business Media LLC - Tập 8 - Trang 1-12 - 2019
Zhi-Ming Yan, Long-Yi Shao, David Large, Hao Wang, Baruch Spiro
Milankovitch periodicities of 123 kyr (eccentricity), 35.6 kyr (obliquity), and 21.2 kyr (precession) were identified in geophysical logs of three Late Permian coals: 17#, 18#, and 17 + 18#, from the Songhe mining area in western Guizhou Province. Based on the astronomic temporal framework, the periods of deposition of the 17# (5.6 m), 18# (6.4 m), and 17 + 18# (5.4 m) coals were constrained to 14...... hiện toàn bộ
A new Bergeria (Flemingitaceae) from the Mississippian of Xinjiang, NW China and its evolutionary implicationsSpringer Science and Business Media LLC - Tập 8 - Trang 1-10 - 2019
Ru Feng, Ashalata D’Rozario, Jian-Wei Zhang
A new Bergeria (Lepidodendrales, Flemingitaceae), B. wenquanensis sp. nov., is described in this paper, typically characterized by the longest and elongated leaf cushions ever found. The specimen, collected from the Mississippian of Wenquan County, Xinjiang Uygur Autonomous Region, China, is represented by a fossil stem about two meters long, with distinct leaf cushions. The genus Bergeria has usu...... hiện toàn bộ