DOI: 10.1111/gbi.12270
Scopus记录号: 2-s2.0-85040721269
论文题名: Late Cretaceous marine arthropods relied on terrestrial organic matter as a food source: Geochemical evidence from the Coon Creek Lagerstätte in the Mississippi Embayment
作者: Vrazo M.B. ; Diefendorf A.F. ; Crowley B.E. ; Czaja A.D.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2018
卷: 16, 期: 2 起始页码: 160
结束页码: 178
语种: 英语
Scopus关键词: arthropod
; biomarker
; calcium carbonate
; Campanian
; carbon isotope
; crab
; Cretaceous
; crustacean
; depositional environment
; fossil record
; freshwater environment
; geochemistry
; Maastrichtian
; marine environment
; mollusc
; nearshore environment
; organic carbon
; organic matter
; paleoecology
; paleoenvironment
; phytoplankton
; thermal maturity
; Coon Creek
; Mississippi Embayment
; United States
; Wisconsin
; Arthropoda
; Crustacea
; Decapoda (Crustacea)
; Mollusca
; Upogebiidae
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: The Upper Cretaceous Coon Creek Lagerstätte of Tennessee, USA, is known for its extremely well-preserved mollusks and decapod crustaceans. However, the depositional environment of this unit, particularly its distance to the shoreline, has long been equivocal. To better constrain the coastal proximity of the Coon Creek Formation, we carried out a multiproxy geochemical analysis of fossil decapod (crab, mud shrimp) cuticle and associated sediment from the type section. Elemental analysis and Raman spectroscopy confirmed the presence of kerogenized carbon in the crabs and mud shrimp; carbon isotope (δ13C) analysis of bulk decapod cuticle yielded similar mean δ13C values for both taxa (−25.1‰ and −26‰, respectively). Sedimentary biomarkers were composed of n-alkanes from C16 to C36, with the short-chain n-alkanes dominating, as well as other biomarkers (pristane, phytane, hopanes). Raman spectra and biomarker thermal maturity indices suggest that the Coon Creek Formation sediments are immature, which supports retention of unaltered, biogenic isotopic signals in the fossil organic carbon remains. Using our isotopic results and published calcium carbonate δ13C values, we modeled carbon isotope values of carbon sources in the Coon Creek Formation, including potential marine (phytoplankton) and terrestrial (plant) dietary sources. Coon Creek Formation decapod δ13C values fall closer to those estimated for terrigenous plants than marine phytoplankton, indicating that these organisms were feeding primarily on terrigenous organic matter. From this model, we infer that the Coon Creek Formation experienced significant terrigenous organic matter input via a freshwater source and thus was deposited in a shallow, nearshore marine environment proximal to the shoreline. This study helps refine the paleoecology of nearshore settings in the Mississippi Embayment during the global climatic shift in the late Campanian–early Maastrichtian and demonstrates for the first time that organic δ13C signatures in exceptionally preserved fossil marine arthropods are a viable proxy for use in paleoenvironmental reconstructions. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85015
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC, United States; Department of Geology, University of Cincinnati, Cincinnati, OH, United States; Department of Anthropology, University of Cincinnati, Cincinnati, OH, United States
Recommended Citation:
Vrazo M.B.,Diefendorf A.F.,Crowley B.E.,et al. Late Cretaceous marine arthropods relied on terrestrial organic matter as a food source: Geochemical evidence from the Coon Creek Lagerstätte in the Mississippi Embayment[J]. Geobiology,2018-01-01,16(2)