Eocene-Oligocene greenhouse to icehouse transition on a subtropical clastic shelf: The Jackson-Vicksburg Groups of the eastern Gulf Coastal Plain of the United States

Fluegeman, Richard H.; Grigsby, Jeffry D.; Hurley, John V.

doi:10.1130/2009.2452(17)

Cited by 5 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Initial examination of cuttlebones of Mississaepia mississippiensis [7] from the Late Eocene (34.36mya) [8] from the Yazoo Clay, Jackson Group, Hinds County, Mississippi ( Figure 1 ) by light microscopy revealed yellowish-brown sheet-like structures that appeared to have been originally organic. EDS examination of these structures revealed phosphorus.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Organics Consistent with β-Chitin Preserved in the Late Eocene Cuttlefish Mississaepia mississippiensis

et al. 2011

View full text Add to dashboard Cite

BackgroundPreservation of original organic components in fossils across geological time is controversial, but the potential such molecules have for elucidating evolutionary processes and phylogenetic relationships is invaluable. Chitin is one such molecule. Ancient chitin has been recovered from both terrestrial and marine arthropods, but prior to this study had not been recovered from fossil marine mollusks.Methodology/Principal FindingsOrganics consistent with β-chitin are recovered in cuttlebones of Mississaepia mississippiensis from the Late Eocene (34.36 million years ago) marine clays of Hinds County, Mississippi, USA. These organics were determined and characterized through comparisons with extant taxa using Scanning Electron Microscopy/Energy Dispersive Spectrometry (SEM/EDS), Field Emission Scanning Electron Microscopy (Hyperprobe), Fourier Transmission Infrared Spectroscopy (FTIR) and Immunohistochemistry (IHC).Conclusions/SignificanceOur study presents the first evidence for organics consistent with chitin from an ancient marine mollusk and discusses how these organics have been degraded over time. As mechanisms for their preservation, we propose that the inorganic/organic lamination of the cuttlebone, combined with a suboxic depositional environment with available free Fe2+ ions, inhibited microbial or enzymatic degradation.

show abstract

Section: Introductionmentioning

confidence: 99%

Characterization of Organics Consistent with β-Chitin Preserved in the Late Eocene Cuttlefish Mississaepia mississippiensis

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Lithology follows Dockery III et al (1991) and the timescale follows Westerhold et al (2014). Best fit lines for the models of Fluegeman et al (2009) and this work are represented as green and red lines, respectively. Sedimentation rates are also indicated.…”

Section: Integrated Age Modelmentioning

confidence: 98%

“…Establishing a robust age model for the Mossy Grove core has required significant effort and the integration of dinocyst, calcareous nannofossil, and radiometric dating techniques. Initial age models were based on planktonic foraminifera assemblage data (Fluegeman, 1996;Fluegeman et al, 2009), but due to low planktonic foraminifera abundances, especially in the upper part of the core (< 91.4 m; 300 ft), this age model relied upon poorly calibrated secondary markers. For instance, the direct placement of the EOB, based on the last occurrence of the Hantkeninidae, is problematic as the record of Hantknenina alabamensis, the only hantkeninid species found in the core, is poor and discontinuous above ∼ 86.6 m (284 ft).…”

Section: Mossy Grove Boreholementioning

confidence: 99%

“…Radiometric 40 Ar/ 39 Ar dating is significantly offset from the existing planktonic foraminifera biochronology. Ben-tonite layers at ∼ 26.5 m (87 ft) and ∼ 84.4 m (277 ft) were dated to 33.40 and 34.36 Ma, respectively (Obradovich and Dockery III, 1996), whereas foraminifera biochronology places these bentonites at ∼ 33.87 and 35.33 Ma, respectively (Fluegeman et al, 2009), an offset of between ∼ 0.5 and 1 Myr. This mismatch has implications for the accurate placement of the EOB in this section; assuming a constant sedimentation rate within the interval between the bentonites, radiometric dating would place the boundary at ∼ 56.7 m (186 ft), which is ∼ 30.2 m (99 ft) lower than the existing foraminiferal estimate of ∼ 26.5 m (87 ft) (Fluegeman et al, 2009).…”

Section: Mossy Grove Boreholementioning

confidence: 99%

“…List of bioevents, biohorizons, and calibrated ages, updated to the timescale of Westerhold et al (2014). Legend: CN -calcareous nannofossils (this study); PF -planktonic foraminifera (Fluegeman et al, 2009); RD -radiometric dating (Obradovich et al, 1993;Obradovich and Dockery III, 1996) ium phoenix. Dinogymnium sibiricum, Litosphaeridium siphoniphorum, and Palaeohystrichophora infusorioides, as well as early and middle Eocene dinocyst taxa Hystrichosphaeridium tubiferum Mudge and Bujak, 1996), Wetzeliella articulata Mudge and Bujak, 1996), Piladinium columna Mudge and Bujak, 1996), and Diphyes ficusoides (Gradstein et al, 1992).…”

Section: Dinocyst Biostratigraphic Frameworkmentioning

confidence: 99%

See 2 more Smart Citations

Organic-walled dinoflagellate cyst biostratigraphy of the upper Eocene to lower Oligocene Yazoo Formation, US Gulf Coast

Mota

Harrington²,

Jones

2020

J. Micropalaeontol.

View full text Add to dashboard Cite

Abstract. New data from a continuously cored succession, the Mossy Grove core, near Jackson, central Mississippi, recovered ∼137 m of marine clays (Yazoo Formation), spanning ∼5 Ma and including the critical Eocene–Oligocene transition (EOT) event. These clay-rich sediments yield well-preserved calcareous microfossil and palynomorph assemblages. Here, we present a new organic-walled dinoflagellate cyst (dinocyst) biostratigraphic framework, including the recognition of 23 dinocyst bioevents. These are integrated with new age constraints based on calcareous nannofossil biostratigraphy and a reassessment of the existing radiometric dates and planktonic foraminiferal biostratigraphy, permitting the establishment of a robust and significantly refined age model for the core. According to this new age model, a major increase in sedimentation rate – from ∼2.1 to ∼4.7 cm kyr−1 – is observed at a core depth of ∼89.1 m (∼34.4 Ma). In the new age model the section is significantly older than previously thought, by up to 1 Ma, with the Eocene-Oligocene boundary (∼33.89 Ma) placed ∼34 m below the level previously identified. With these more accurate age estimates, future isotopic and palaeoecological work on this core can be more precisely integrated with other, globally distributed records of the EOT.

show abstract

Multi-proxy evidence for sea level fall at the onset of the Eocene-Oligocene transition

et al. 2023

View full text Add to dashboard Cite

Continental-scale expansion of the East Antarctic Ice Sheet during the Eocene-Oligocene Transition (EOT) is one of the largest non-linear events in Earth’s climate history. Declining atmospheric carbon dioxide concentrations and orbital variability triggered glacial expansion and strong feedbacks in the climate system. Prominent among these feedbacks was the repartitioning of biogeochemical cycles between the continental shelves and the deep ocean with falling sea level. Here we present multiple proxies from a shallow shelf location that identify a marked regression and an elevated flux of continental-derived organic matter at the earliest stage of the EOT, a time of deep ocean carbonate dissolution and the extinction of oligotrophic phytoplankton groups. We link these observations using an Earth System model, whereby this first regression delivers a pulse of organic carbon to the oceans that could drive the observed patterns of deep ocean dissolution and acts as a transient negative feedback to climate cooling.

show abstract

Eocene-Oligocene greenhouse to icehouse transition on a subtropical clastic shelf: The Jackson-Vicksburg Groups of the eastern Gulf Coastal Plain of the United States

Cited by 5 publications

References 0 publications

Characterization of Organics Consistent with β-Chitin Preserved in the Late Eocene Cuttlefish Mississaepia mississippiensis

Characterization of Organics Consistent with β-Chitin Preserved in the Late Eocene Cuttlefish Mississaepia mississippiensis

Organic-walled dinoflagellate cyst biostratigraphy of the upper Eocene to lower Oligocene Yazoo Formation, US Gulf Coast

Multi-proxy evidence for sea level fall at the onset of the Eocene-Oligocene transition

Contact Info

Product

Resources

About