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DOI | 10.1016/j.palaeo.2019.109370 |
Lower Sappington Formation palynofacies in Montana confirm upper famennian black shale paleoenvironments and sequences across western North America | |
di Pasquo M.; Grader G.W.; Kondas M.; Doughty P.T.; Filipiak P.; Rice B.J.; Isaacson P.E. | |
发表日期 | 2019 |
ISSN | 0031-0182 |
卷号 | 536 |
英文摘要 | For the first time, Late Devonian palynofacies analyses of the Lower Sappington shale units U1A─D was carried out at Peak 9559 (Sacajawea) and Ainger Lake in the Bridger Range of Montana. Diagnostic spore species Apiculiretusispora verrucosa, Diducites mucronatus and D. versabilis allowed the correlation of our U1A-D with the European Late Famennian A. verrucosa-V. hystricosus Palynozone. The first appearance of Gorgonisphaeridium winslowiae in U1 is the oldest record before the inception of Retispora lepidophyta. Four palynofacies correlative with U1A-D and new findings of invertebrates and microfossils allow the interpretation of paleoenvironmental changes. Amorphous organic matter, marine phytoplankton and pyrite in black shales of U1A-B indicate anoxic bottom conditions occurred in offshore marine environments. An erosional fossiliferous phosphatic lag above these units confirms a regional SB. U1C black shales composed by AOM, marine and terrestrial phytoplankton, land–derived remains and pyrite reveal shallower, dysoxic-anoxic, brackish water environments. A thin layer at the base of Unit 1D yielded AOM and marine phytoplankton and low terrestrial input indicating dysoxic-anoxic conditions were maintained. The lack of organic matter and the presence of invertebrates and microfossils in a thin green fossiliferous mudstone supports the establishment of normal, oxygenated marine conditions maintained in the basal Middle Sappington Member (U2). These two thin units are not part of the underlying anoxic black shale (U1A-B) sequence as commonly was over-simplified. Instead, they are part of a transgressive interval with the basal Middle Sappington. A correlation of the U1 shale interval is established with the global multiphase Dasberg Event. © 2019 Elsevier B.V. |
英文关键词 | Anoxia; Biotic changes; Bridger range; Dasberg event; Lower Bakken Formation; Palynology |
语种 | 英语 |
scopus关键词 | amorphous medium; anoxic conditions; biostratigraphy; black shale; brackish water; Devonian; facies analysis; microfossil; paleoenvironment; palynology; sequence stratigraphy; Bridger Basin; United States; Wyoming; Invertebrata |
来源期刊 | Palaeogeography, Palaeoclimatology, Palaeoecology
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/150764 |
作者单位 | Laboratorio de Palinoestratigrafía y Paleobotánica, CICYTTP (CONICET-Entre Ríos-UADER), Dr. Materi y España SN, Diamante (E3105BWA), Diamante, Entre Ríos, Argentina; PRISEM Geoscience Consulting, 1011 West 27th Ave., Spokane, WA 99203, United States; Faculty of Earth Sciences, University of Silesia in Katowice, Będzińska 60, PL-41-200 Sosnowiec, Poland; Department of Geological Sciences, University of Idaho, Moscow, ID 83844, United States; Idaho Geological Survey, Boise, ID 83702, United States |
推荐引用方式 GB/T 7714 | di Pasquo M.,Grader G.W.,Kondas M.,et al. Lower Sappington Formation palynofacies in Montana confirm upper famennian black shale paleoenvironments and sequences across western North America[J],2019,536. |
APA | di Pasquo M..,Grader G.W..,Kondas M..,Doughty P.T..,Filipiak P..,...&Isaacson P.E..(2019).Lower Sappington Formation palynofacies in Montana confirm upper famennian black shale paleoenvironments and sequences across western North America.Palaeogeography, Palaeoclimatology, Palaeoecology,536. |
MLA | di Pasquo M.,et al."Lower Sappington Formation palynofacies in Montana confirm upper famennian black shale paleoenvironments and sequences across western North America".Palaeogeography, Palaeoclimatology, Palaeoecology 536(2019). |
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