气候变化领域集成服务门户(CCPortal): Integrated δ 13 C carb , conodont, and graptolite biochemostratigraphy of the Silurian from the Illinois Basin and stratigraphic revision of the Bainbridge Group

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DOI	10.1130/B32033.1
	Integrated δ 13 C carb , conodont, and graptolite biochemostratigraphy of the Silurian from the Illinois Basin and stratigraphic revision of the Bainbridge Group
	McAdams N.E.B.; Cramer B.D.; Bancroft A.M.; Melchin M.J.; Devera J.A.; Day J.E.
发表日期	2019
ISSN	167606
起始页码	335
结束页码	352
卷号	131 期号:2021-01-02
英文摘要	The Illinois Basin of southwestern Illinois and southeastern Missouri contains one of the most extensive Silurian records in North America and is a potentially critical area for global sea-level and paleoclimatic/ paleoceanographic studies. Unfortunately, the Silurian stratigraphy regionally remains understudied and often can only be correlated globally at series level. Silurian strata from southwestern Illinois and southeastern Missouri are currently assigned to the Sexton Creek Limestone, Seventy-Six Shale, St. Clair Limestone, and Moccasin Springs Formation. The latter three units are variously considered members of the Bainbridge Formation or formations within the Bainbridge Group. We advocate the formalization of the term Bainbridge at the group level throughout its area of use, composed of (in ascending order) the Seventy-Six Formation (raised in rank and geographically expanded herein), the St. Clair Formation (stratigraphically expanded herein), and the Moccasin Springs Formation with four members: the Greens Ferry, Sheppard Point, Lithium (proposed herein), and Randol members. The Bainbridge Group is unconformably underlain by the Silurian Sexton Creek Formation and conformably overlain by the ? Pridoli-Devonian Bailey Formation. Herein, additional nomenclatural changes are presented to the Cason Formation of Arkansas as well. Integrated carbon isotope (δ 13 C), conodont, and graptolite biochemostratigraphy of three localities in the southwestern Illinois and southeastern Missouri area indicate the presence of the early Sheinwoodian "Ireviken," Homerian "Mulde," and Ludfordian "Lau" positive carbon isotope excursions in the Bainbridge Group (the first published consecutive occurrence from North America). The stratigraphic revisions presented in this study provide a consistent and widely applicable lithostratigraphic nomenclature for the Bainbridge Group throughout its areal extent. This study also provides the first detailed integrated biochemostratigraphic record of all three major Wenlock-Ludfordian δ 13 C excursions from this important Laurentian basin, and it enables the first precise correlation of the Bainbridge Group into the global Silurian chronostratigraphic scheme. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184965
作者单位	Department of Earth and Environmental Sciences, University of Iowa, Iowa City, IA 52242, United States; Indiana Geological and Water Survey, Indiana University, Bloomington, IN 47405, United States; Department of Earth Sciences, St. Francis Xavier University, Antigonish, NS B2G 2W5, Canada; Illinois State Geological Survey, Prairie Research Institute, University of Illinois, Champaign, IL 61820, United States; Department of Geography-Geology, Illinois State University, Normal, IL 61790, United States; Department of Geosciences, Texas Tech University, P.O. Box 41053, Lubbock, TX 79409-1053, United States
推荐引用方式 GB/T 7714	McAdams N.E.B.,Cramer B.D.,Bancroft A.M.,et al. Integrated δ 13 C carb , conodont, and graptolite biochemostratigraphy of the Silurian from the Illinois Basin and stratigraphic revision of the Bainbridge Group[J],2019,131(2021-01-02).
APA	McAdams N.E.B.,Cramer B.D.,Bancroft A.M.,Melchin M.J.,Devera J.A.,&Day J.E..(2019).Integrated δ 13 C carb , conodont, and graptolite biochemostratigraphy of the Silurian from the Illinois Basin and stratigraphic revision of the Bainbridge Group.Bulletin of the Geological Society of America,131(2021-01-02).
MLA	McAdams N.E.B.,et al."Integrated δ 13 C carb , conodont, and graptolite biochemostratigraphy of the Silurian from the Illinois Basin and stratigraphic revision of the Bainbridge Group".Bulletin of the Geological Society of America 131.2021-01-02(2019).