WebThese new data, and particularly the presence of the chitinozoan index fossil Hercochitina crickmayi, combined with emerging stable carbon isotope data, suggest a Late Ordovician (Katian or Hirnantian) age for these formations, which is older than their previously suggested Silurian (Rhuddanian) age. abstract_full: - lang: eng text: A restudy of the … WebThe pre-Hirnantian Kinnella laurentiana Stott and Jin, 2007 from Canada (Manitoulin Island) differs from the Baltic specimens in having more convex valves, apsacline ventral area and arrangement of ribs with median costa on the dorsal valve instead of “a strong axial interspace in brachial valve…” on K. kielanae (Temple 1965: 403) and the Baltic specimens.
International Commission on Stratigraphy
• John Bevis Beeston Bancroft: Correlation tables of the stages Costonian-Onnian in England and Wales. 4 S., Blakeney, Gloucestershire 1933. • Xu Chen, Jiayu Rong, Junxuan Fan, Renbin Zhan, Charles E. Mitchell, David A.T. Harper, Michael J. Melchin, Ping'an Peng, Stan C. Finney and Xiaofeng Wang: The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hirnantian Stage (the uppermost of the Ordovician System). Episodes, 29(3): 183-196, Beijing 2… WebOther articles where Hirnantian Age is discussed: Ordovician-Silurian extinction: …extinction event occurring during the Hirnantian Age (445.2 million to 443.8 million … cincy shirts address
Category:Hirnantian - Wikipedia
WebThis study uses logging data, mineral component content, total organic carbon (TOC) content, and microscopic characteristics of the organic-rich shales in the Wufeng and Longmaxi Formations, as well as data reported by other researchers, to demonstrate that upwelling has played an important role in the organic matter enrichment. The results … Web18 set 2024 · The Eusebio Ayala Formation is believed to be at least partially of Hirnantian age, based on the recent discovery of a graptolite association including Normalograptus persculptus Salter in Huxley and Etheridge, Reference Huxley and Etheridge 1865 (Alfaro et al., Reference Alfaro, Uriz, Cingolani, Bidone and Galeano Inchausti 2010, Reference … diabetes and hyponatremia