Article
Geology
Byung-Do Choi, Baoyan Jia, Min Huh, Jongyun Jung, Yaqiong Wang
Summary: A total of seven species of cypridoidean ostracods were discovered in three sections in the Gyeongsang Basin, South Korea. The presence of one species is a first record in Korea. The taphonomic features indicate the presence of two distinct thanatocoenoses, and the absence of certain species may be attributed to unstable environments and low competitiveness.
CRETACEOUS RESEARCH
(2021)
Article
Geography, Physical
Hongjie Zhang, Haifeng Fan, Fang Zhang, Hanjie Wen
Summary: The study found that during the late Ediacaran to early Cambrian, there were common hypersaline conditions in shallow-water environments and brackish to normal seawater salinity in middle- to deep-water environments in the Nanhua Basin. Two transient low-salinity intervals were observed in the shallow-water regions due to increased freshwater inputs. The study also revealed that high salinity restricts metazoan diversification, while the combination of normal seawater salinity and oxic watermass promotes biological explosion.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geochemistry & Geophysics
Matthew Valetich, Diana Zivak, Carl Spandler, Helen Degeling, Micaela Grigorescu
Summary: This study investigates variations in rare earth element (REE) concentrations in phosphorites from different locations in the Georgina Basin, finding significantly higher concentrations in the southern region compared to the central and northern regions. The authors suggest that the variations in REE concentrations in phosphorites are primarily controlled by structural differences and local seawater composition.
Article
Biology
James D. Holmes, John R. Paterson, Diego C. Garcia-Bellido
Summary: Analyzing the growth dynamics of trilobites revealed significant changes in post-embryonic axial growth at different developmental stages, which are closely related to sexual maturity in extant euarthropods. The observed body segmentation patterns in trilobites suggest a complex series of changing growth controls, indicating a more complex development than previously thought.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Maqsood Ur Rahman, Muhammad Hanif, Tao Jiang, Sohail Wahid
Summary: This study focused on the analysis of the Alveolinid group of larger benthic foraminifera in the eastern Neo-Tethys region, identifying and discussing 19 species from the Ypresian and Early Lutetian ages. Their biometrics, taxonomy, and biostratigraphic correlation with the western and central Neo-Tethys were examined, providing further evidence for understanding the evolution and distribution of Alveolina species in the Tethyan realm.
GEOLOGICAL JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Fernanda Luft-Souza, Gerson Fauth, Mauro D. R. Bruno, Marcelo A. De Lira Mota, Bernardo Vazquez-Garcia, Marcos A. B. Santos Filho, Gerson J. S. Terra
Summary: The fossil-rich sedimentary successions in the Sergipe-Alagoas Basin provide valuable insights into the early stages of the South Atlantic Ocean development and major paleoceanographic events during the late Early Cretaceous.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Meng Cheng, Zihu Zhang, Chengsheng Jin, Wei Wei, Haiyang Wang, Thomas J. Algeo, Chao Li
Summary: Despite uncertainties about the degree of connectedness between the early Cambrian Nanhua Basin and the open ocean, analyzing the B/Ga proxy reveals a salinity gradient in the basin. Regional tectonic and/or global sea-level changes increased watermass exchange with the open ocean, weakening water-column stratification and reducing deep-water anoxia. This enhanced oceanic oxygenation, along with global environmental controls, modulated the expression of the Cambrian Explosion in South China.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Geology
Manuel Vieira, Salih Mahdi, Manuel Casas-Gallego, Michael Ayress
Summary: This study presents high-resolution palynological and micropalaeontological analyses of an upper Maastrichtian cored succession from a well in the More Basin (Norwegian continental shelf). Various assemblages of dinoflagellate cysts and foraminifera provide insights into the palaeobiogeography and palaeoenvironmental conditions during the late Maastrichtian. An outer neritic setting is interpreted based on the high abundance of planktonic foraminifera.
CRETACEOUS RESEARCH
(2022)
Article
Multidisciplinary Sciences
J. Javier Alvaro, Lars E. Holmer, Yanan Shen, Leonid E. Popov, Mansoureh Ghobadi Pour, Zhifei Zhang, Zhiliang Zhang, Per Ahlberg, Heikki Bauert, Laura Gonzalez-Acebron
Summary: This study documents two massive precipitation events of polymetallic ore deposits in the Cambrian period. The deposits were triggered by non-buoyant hydrothermal plumes and formed through lateral dispersion of effluents and sulphide particle settling. The deposits were sealed by carbonate crusts and displayed the presence of three generations of carbonate crystals. The findings provide significant insights into the formation process of polymetallic ore deposits.
SCIENTIFIC REPORTS
(2022)
Article
Geography, Physical
Russell D. C. Bicknell, James D. Holmes, Stephen Pates, Diego C. Garcia-Bellido, John R. Paterson
Summary: The Cambrian explosion marked the rapid development of complex marine ecosystems on Earth due to predator-prey interactions, which led to the evolution of biomineralised exoskeletons and shell-crushing predators. Injured trilobite specimens from Kangaroo Island, South Australia show evidence of attacks mostly on the posterior thorax, suggesting predators attacked from behind. Larger individuals were more likely to survive attacks and exhibit healed injuries, indicating smaller individuals were likely consumed during an attack.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geology
Marcos Antonio Batista dos Santos Filho, Gerson Fauth, Benjamin Sames
Summary: The paper describes 19 ostracod species extracted from two adjacent sections in the Oros Formation of the Iguatu Basin, Brazil, and infers a Hauterivian-Aptian interval based on these species.
CRETACEOUS RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Feiyang Chen, Glenn A. Brock, Marissa J. Betts, Zhiliang Zhang, Hao Yun, Robert Matthew Klaebe, Brittany Laing, Zhifei Zhang
Summary: The study focuses on the advancements made in biostratigraphy, lithostratigraphy, and isotope chemostratigraphy of the lower Cambrian successions in South Australia, particularly in the Arrowie Basin. By analyzing sedimentological, biostratigraphic, and chemostratigraphic data in the eastern Stansbury Basin, the research provides insights into the deepening depositional environment and older age of the lower Heatherdale Shale. The integrated study enhances regional chronostratigraphic resolution and interbasinal correlation, contributing to a better understanding of the depositional setting in the lower Cambrian package in South Australia.
GEOLOGICAL MAGAZINE
(2021)
Article
Geography, Physical
Zhiruo Chen, Guochang Wang, Chengsheng Jin
Summary: This study evaluates environmental conditions in the early Cambrian Nanhua Basin using multiple proxies, and finds the co-existence of different redox environments. The fluctuations in environmental conditions are linked to hydrographic restriction.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Paleontology
Anne Hildenbrand, Gregor Austermann, Christina Ifrim, Peter Bengtson
Summary: New, well-preserved agnostid trilobite material has been collected from the type locality of the Drumian Manuels River Formation in Newfoundland, Canada, showing distinct interval zones in the succession. The Ptychagnostus atavus Zone is shorter and stratigraphically higher compared to other sections, while the Ptychagnostus punctuosus Zone can be correlated globally. The faunal assemblage is similar to Scandinavia, Greenland, and England.
PAPERS IN PALAEONTOLOGY
(2021)
Article
Biology
Mei Luo, Fan Liu, Yue Liang, Luke C. Strotz, Jiayue Wang, Yazhou Hu, Baopeng Song, Lars E. Holmer, Zhifei Zhang
Summary: Small skeletal fossils from the early Cambrian Guojiaba Formation in southern Shaanxi, China were reported for the first time. The fossils include a wide variety of skeletal clades, such as brachiopods, sphenothallids, archaeocyaths, bradoriids, sponge spicules, echinoderm plates, and trilobite spines. The archaeocyaths found in the Guojiaba Formation are older than those previously described from the Xiannvdong Formation. The fossil assemblages from the Guojiaba Formation resemble those from the upper Yu'anshan Formation (Chengjiang Fauna) in eastern Yunnan Province, supporting the correlation of the Guojiaba Formation with the Chiungchussuan Stage (Stage 3 of Cambrian Series 2).